Science topic

Construction Engineering - Science topic

Explore the latest questions and answers in Construction Engineering, and find Construction Engineering experts.
Questions related to Construction Engineering
  • asked a question related to Construction Engineering
Question
3 answers
I hold an M.Tech degree in Construction Engineering and Management. I work in a CPSU in India. I want to pursue a Ph.D. as a part-time external candidate in one of the universities in Tamilnadu, or Karnataka.. What are the trends for areas of research in Civil Engineering. Also suggest college/university where the same could be taken up. I belong to Tamilnadu and presently working in Karnataka.
Relevant answer
Answer
It could include how to reduce construction costs through the recycling of material used in construction, from cement to steel structures. I'm not from India, I really don't know how they handle the construction and the waste that is generated. But it is a good option for a thesis.
  • asked a question related to Construction Engineering
Question
15 answers
To whom it may concern...
Case shown in pictures below need to stop in front of it...
Starting with the way of supporting slab before casting.. the question appear...
Based on your engineering opinion, and supporting method that you might used... is what shown in pictures attached ,.. enough.. ?
Then... whom responsibility is that... if slab fail during casting process, as there will be additional loading of pumped concrete and labors also ...? where that will be the most important question....
Relevant answer
Answer
Dear Sir,
supervision consultant needs to verify the scaffolding design which considers all loads of concrete and labors, usually the scaffolding specialist to provide full calculations, this specialist works under the contractor umbrella, both of contractor and supervision consultant did not perform well
  • asked a question related to Construction Engineering
Question
8 answers
To whom it may concern...
Case shown in pictures below need to stop in front of it...
What the mean of overload... What will be the meaning of calculated loading before design... and.... What really mean the structural design based on submitted data..
All, in general,.. knows that.. design start with converting functional use of the building to loading on structural element... then start design element by element ...
So, what might be the supposed loading to one story house... based on all adopted code... ? this is the first question..
Then what you think, .. or what the supervisor engineer might think the value of such loading on that slab shown in pictures attached... ? this is the second question...
Then at last... whom responsibility is that... if failure occur...? where that will be the most important question....
Limited education with low experiences causes such cases, ... or... we need to ask the supervised engineer if he care...
Relevant answer
Answer
Invariably the loading on one storey building roof with access is only `1.5 to 2 kN/m2 . and this is uni-formally distributed load. But if you pile up load in a small area more than the failure load of slab with concentrated load then the failure is imminent. this failure load can be calculated using yield line theory or by Hillerborg Strip method.
If you have this kind of loading then keep your props intact before you finish roof top work
  • asked a question related to Construction Engineering
Question
15 answers
Picture attached shows the case of complete reinforcement of raft foundation, but after sand storm, as appear, more than 20mm layer form from sand under the reinforcement.... on your opinion, what might do to continue with work...?
Relevant answer
Answer
excellent quesion
  • asked a question related to Construction Engineering
Question
2 answers
Complex graphical sketches are highly involved in Culmann's methods. Therefore, it is highly prone for getting deviations in magnitudes for resultant pressure on retaining wall. I would like to get suggestions from RG colleagues on why Culmann's graphical approach is mostly preferred in many research papers albeit Rankine's method is easy and precise in terms of equations and substitutions. I would welcome answers from both theoretical and practical perspectives.
Relevant answer
Answer
Perhaps this is due to the fact that the graphical method makes it possible to "see" the calculation. Psychological factor in choosing a method.
  • asked a question related to Construction Engineering
Question
8 answers
Hi,
While each of the 4 main criteria can include many sub-criteria, this question is about how companies in real-world projects set boundaries between them in their documentations (submittals and reports). For example, the training of project people criterion is it reported in the cost, or the quality, or the sustainability. Are there any references for these boundaries? With my very limited experience, I think tools like BREEAM and ISO are not clear enough for me as an academic student to help setting up such boundaries.
Please, can you indicate if your answer is based on project experience in this field?
Thank you very much beforehand.
Relevant answer
Answer
Badeel Almahdawiy there are many ways and surely the experts have tried to answer and I am impressed with the answers above laid by the experts as they have nailed it., However I do feel strongly about such points which I have listed below and these are quite helpful when you want to set boundaries between cost, time, quality, and sustainability .... and you can say there are simple five ways where the impact by making more sustainable projects can be seen such as:
Reduction in the overall fuel consumption and this has to be reduced drastically
Designs of the buildings have to be Environmental friendly and conscious
Waste treatment methods should be scientific
There should not be any type of pollution
The material used has to be in the form of sustainable material and hope so this is in line with your requirement
  • asked a question related to Construction Engineering
Question
4 answers
Respected Sir/Madam,
I am currently undertaking my master’s dissertation, which critically analyses delays in road construction projects in India through this questionnaire. For the purposes of my dissertation, all information provided will be handled with utmost confidentiality.
I would be most grateful if you could take some few minutes to fill in the questionnaire attached to this letter.
Road Constructing Engineers, Contractors, Consultants and experienced experts can take this survey.
Relevant answer
Answer
Questionnaire Done
  • asked a question related to Construction Engineering
Question
1 answer
Assuming we have a piece of timber C16 - 100x100x1000mm and we apply UDL + a point load at middle point on it (parallel to the fibre) as shown below, how much will the timber compress between the force and the concrete surface ?
I have attached a sketch as well. Please see below.
If you could show a detailed calculation would be much appreciated. Thank you!
Relevant answer
Answer
Kindly find my working if you need more tutorials you can follow me on research gate. I can teach you for free.
  • asked a question related to Construction Engineering
Question
24 answers
I need suggestions for a PhD research in the field of Construction Engineering and Management?
Relevant answer
Answer
Good potential topics:
1. Cost analysis of zero carbon footprint construction vs. traditional construction. Comparative analysis of cost per unit of each, and life-cycle of the building.
2. Benefit of small construction companies as metric of overall GNP, and ways to improve worker lifestyles by small businesses.
3. Cost analysis of reinforced Insulated Concrete Foam block construction vs. traditional wood, masonry and steel construction.
There's a couple to evaluate.
  • asked a question related to Construction Engineering
Question
10 answers
Material Flow Analysis (MFA) is often applied at regional and urban level in order to understand and improve flows and stocks of construction materials.
Do you know examples (case studies or conceptual frameworks) of an MFA applied at building level (for instance a single residential or office building) ?
Thank you for your contribution.
Relevant answer
Answer
Dear Vaishali, the paper is was mentioning about MFA at building level (with special focus on material flows during the building operation stage) is now published:
  • asked a question related to Construction Engineering
Question
2 answers
Exfoliated Kaolinite-Clay.
Thanks in advance.
Relevant answer
Answer
This is a good question.
  • asked a question related to Construction Engineering
Question
32 answers
Overall Sciences ... Overall Designs... Do we need always to consider Factor of Safety ... ?
Relevant answer
Answer
Yes we have to consider factor of safety depending on standards we are following and type of material and structure.
  • asked a question related to Construction Engineering
Question
10 answers
Dear Colleagues,
Construction project management is a process that includes a number of operations, activities, and decisions that are closely related to an executed investment and that aim to create new, or to increase, existing fixed assets in order to achieve utility effects. The utility effect of the construction process may be the construction of a new building, or the renovation or modernization of an existing building. In each construction process, according to the definition of the building object's life cycle, the following four basic phases are distinguished: the programming/planning phase, the implementation phase, the operation/use/maintenance phase, and the phase of decommissioning or demolition. Appropriate planning of the entire construction process is a very important operation, which has a direct impact on whether success is achieved when implementing an investment project.
The construction industry is characterized by a high complexity of implemented construction processes, variability of implementation conditions, diversity of facilities, applied technologies, and methods of work organization. The execution of construction projects is specific and particularly difficult because each implementation is a unique, complex, and dynamic process that consists of several or more subprocesses related to each other, in which various participants of the investment process take part.
Therefore, there is still a vital need to study, research, and conclude engineering technology and management applied in construction projects.
We encourage publishing applied results of research.
Relevant answer
Answer
Is the paper in the project management field accepted?
  • asked a question related to Construction Engineering
Question
3 answers
I am doing a comparative LCA study between different roads in EU and I am looking for data related to machines used during (for instance: laying the pavement, etc.) the construction and maintenance phase of the road ( ex. per 1m2 or 1 km of road).
Thanks!!
Relevant answer
Answer
For LCA, i have been used various softwares such as SimaPro, GaBi and OpenLCA. You can get different datasets.
  • asked a question related to Construction Engineering
Question
3 answers
I mean the use of the SQUG database to assess the seismic resistance of NPP equipment with the specified type of reactor.
Relevant answer
Answer
GIP - Generic Implementation Procedure
WWER - water-water energetic reactor
NPP - nuclear power plant
  • asked a question related to Construction Engineering
Question
5 answers
Do you know someone that can be interested?
Professor of Construction Engineering
Ecole de Technologie Superieure
Construction Engineering Department
Montreal, QC, Canada
Date Posted: Feb. 8, 2021
Relevant answer
Answer
Yes, interested
  • asked a question related to Construction Engineering
Question
1 answer
Hi everyone,
to calculate the prying forces in the column base plate connections, we need to get the contact reaction between the plate and the concrete, but in my model, I have a part in compression and another one in tension. so how can I evaluate the surface of the plate in tension under the cyclic load ?
Relevant answer
Answer
Dear Aichouche
If I were you, I would forget the Castem and go for SolidWorks Simulation . it's more easier, faster, and efficient.
  • asked a question related to Construction Engineering
Question
21 answers
I have seen that tensile strength of concrete is always lower than compressive strength values (generally 10-12 folds). How can we enhance the tensile strength of the concrete? Is it possible to enhance up to levels similar to compressive strength values either by addition of some SCMs, pozzolanic materials, admixtures, superplasticizers etc. or do we have to change the grade of concrete i.e. M20, M30....... M60 ....so on .., SCC, etc.?
Relevant answer
Answer
Dear Kunal . ,
You can use steel fibres or rubber strips and so on to increase the tensile strength of concrete.
  • asked a question related to Construction Engineering
Question
26 answers
Two similar term in civil engineering.. Foundation and Footing.. any differences between...?
Relevant answer
Answer
Foundation is a structure which transfers the loads from the superstructure to the ground, while footing is the foundation which is in contact with the earth. A foundation can be shallow and deep, while a footing is a type of a shallow foundation. so, all footings are foundations but all foundations cannot be footings.
  • asked a question related to Construction Engineering
Question
6 answers
SRT = british pendulum
Relevant answer
Answer
Hi
The results can be equated from the standards of each and the minimums set in each experiment
  • asked a question related to Construction Engineering
Question
3 answers
In the development of an efficient construction and demolition waste management model, the evaluation of several aspects is necessary. What aspects do you consider relevant in the development of this model?
Relevant answer
Answer
The wastes like chippings from blocks I use the to backfill trenches, and improving on the road.
  • asked a question related to Construction Engineering
Question
6 answers
Do you know any example/case study using state of the art technology for waste management? (e.g., GIS, BIM, Computational tools, Computation Design)
We are working on Construction and demolition waste management in the built environment context, which one can be more useful for waste management in your area (e.g., construction, food, electronic waste etc.)?
We are working on the visualisation techniques and welcome to your participation.
Relevant answer
Answer
Hi Samad Sepasgozar your profile indicates that you are from UNSW, Sydney. I would like to suggest you that read a research articles from Prof. Veena Sahajwalla. Her work in the field of E-waste is interesting, additionally you both are in the same university. This could be better for you..!!
  • asked a question related to Construction Engineering
Question
10 answers
What are the best methods to compare two or more construction material/product standards from different countries?
Relevant answer
Answer
It depends on your product.
  • asked a question related to Construction Engineering
Question
3 answers
My prefered area is in Waste management & BIM , where I have read about using 4D BIM & 5D in waste management , but I have not reached a significant research gap to work on it, so is there any suggestion towards gap areas in using BIM towards waste management?
Relevant answer
Answer
Dear Elhassan,
The current stage of the BIM learning curve and maturity allows construction practitioners to design out both wasteful practices (lean) and solid waste at the design stage. It is definitely a great area of research because construction waste have significant negative implications on cost, society and the environment.
Depending on your research capabilities and availability of data, you may measure, quantify and monetize the quantity of solid construction waste footprint that can be reduced due to the use of BIM in the project. Of course, you would have to compare two or more similar BIM and non-BIM construction projects. Your greatest challenge will be to determine the reduction attributable to solely BIM since lean production principles and offsite industrialized solutions have proven to reduce solid construction waste in projects.
You may search the following paper to use as a good starting point
"How to measure the benefits of BIM" by Barlish and colleague and published in the Journal of Automation in Construction
Good luck
  • asked a question related to Construction Engineering
Question
11 answers
I need to model a construction and demolition waste management network in order to maximize waste recycling. I read some works that use MILP. Among the software used are GAMS, JULIA, MATLAB and R. Are there other software that can be used?
Relevant answer
Answer
I have used most of the tools mentioned before. While each of them has its strengths and weaknesses, nowadays I have been constantly relying on the same tool for solving all kinds of optimization problems.
This tool is a combination of Julia programming language with the Julia package JuMP which defines (in my opinion) the most elegant and intuitive modeling language that makes it easy to try different solvers on the same problem by simply changing the solver name in the code. It also allows easy access to more advanced features of MILP solvers such as generic support for callback functions that can be used to modify the problem while solving it with the addition of valid inequalities and user-defined heuristics.
As an example, solving the TSP using the DFJ (Danzig-Fulkerson-Johnson) formulation that has an exponential number of subtour elimination constraints is straightforward with JuMP. You can simply set up a "lazy constraint callback" function that will check if subtours are present in the solution and if not, add constraints to break these subtours. This is particularly easy when considering only integer solutions, but you can also use the "user callback" function to cut off fractional subtours. JuMP has turorials of several important modeling paradigms that can be used as a basis for your model. Here are the relevant links:
You can download Julia programming language from
Website for the JuMP package
Tutorials for modeling with JuMP
More example problems solved with JuMP
Best regards
Juho
  • asked a question related to Construction Engineering
Question
7 answers
Looking for good information sources, both academic sources and practical examples.
Informed opinions, comments and other types of answers are very much appreciated.
  • asked a question related to Construction Engineering
Question
28 answers
I am planning to build a website " ALL ABOUT CIVIL ENGINEERING " which aims to help students as well as engineers, my goal is to have a website wherein all the material regarding civil engineering is available on this website, who would like to be part of this website by providing me help to build this website, it will be totally educational website focusing on students and engineers, initially planned to keep search tab, providing my youtube links as free lectures,  providing previous years question papers of various universities, IS codes and other countries codes pertaining to civil engineering, Q & A forum to ask questions related to civil engineering by logging in, separate tab for all notes of all subjects and practicals, and also separate section for the articles related to the advances in civil engineering. These are the initial requirements i have planned.
Relevant answer
Answer
You can review some similar websites like
  • asked a question related to Construction Engineering
Question
1 answer
I was wondering if anyone comes across any latest publications on the environmental indicators/measures for adopting prefabrication/modular in any construction applications (commercial/high-rise buildings, building services…etc).
Relevant answer
Answer
Hello Sherif,
I am currently measuring the benefits of modular construction projects and have substantial literature relevant to your question.
Kindly link up for a deeper discussion and possible collaboration
Regards
Ibrahim
  • asked a question related to Construction Engineering
Question
46 answers
Upon your experience on site and concrete on site, the phenomena of discolored of concrete might happens... how do you fix that?
Relevant answer
Answer
Abdelkader Mohamed Abdelkader Elsayed .... Thanks for answering ..
  • asked a question related to Construction Engineering
Question
5 answers
I'd like to analyze a cabled truss structure with opensees which includes both bar and cable elements. As I know bar elements are under tension and compression but cable materials are just under tension. First, how can I define a cable element with pre-stressed value, second, how can I intermix both bar element stiffness and cable stiffness to analyze it nonlinearly ? I know how to define a bar element in opensees but how about a cable element?
Any comment would be appreciated
Thanks in advacne
Relevant answer
Answer
In order to model a tension-only cable in OpenSees you can use ElasticPPGAP material and if you want to add pre-stress you should use initstrain or inistress material in conjuction with ElasticPPGAP material.
You can use both truss or corotruss. the difference is in considering geometric nonlinearity.
  • asked a question related to Construction Engineering
Question
5 answers
Shall construction robots function independently from context factors as stand-alone products (and be designed as such) or be seen, developed, and operated as systems integrated with the context? Or both? Or none? Both directions have advantages and disadvantages of course. What is your experience/opinion on this?
Relevant answer
Answer
We have recently published a series of papers on tools, methodologies, and best practices for early stage R&D and technology management phases in construction. In these papers we look specifically at the "compatibility with context and ecosystem" issue.
· Structuring the context for construction robot development through integrated scenario approach: https://www.researchgate.net/publication/340313559_Structuring_the_context_for_construction_robot_development_through_integrated_scenario_approach
· Influencing factors of the future utilisation of construction robots for buildings: A Hong Kong perspective: https://www.researchgate.net/publication/338958441_Influencing_factors_of_the_future_utilisation_of_construction_robots_for_buildings_A_Hong_Kong_perspective
· A technology management system for the development of single-task construction robots: https://www.researchgate.net/publication/336589214_A_technology_management_system_for_the_development_of_single-task_construction_robots
· A methodological approach to implement on-site construction robotics and automation: a case of Hong Kong: https://www.researchgate.net/publication/324697572_A_methodological_approach_to_implement_on-site_construction_robotics_and_automation_a_case_of_Hong_Kong
Please have a look If you are interested!
  • asked a question related to Construction Engineering
Question
3 answers
Based on an efficient Construction and Demolition Waste (CDW) management it's possible to minimize the irregular deposition of these residues and also to increase their recycling and reuse as material for civil construction. However, there are several aspects that can be used in CDW management. The development of a CDW management model will assist municipalities in adopting actions that bring economic, environmental and social benefits.
Using success cases from some cities makes it possible to understand some aspects that optimized the CDW management in those places. The challenge is to create a model that has broader applicability. In this research, two tools will be used: Multicriteria Decision Analysis (MCDA - AHP) and Geographic Information System (GIS).
At this point, it is necessary to raise (your help is fundamental) the aspects that are relevant in the CDW Management. Thanks for support!
Relevant answer
Answer
Dear Rafael,
I'm currently engaged with the same challenge in my hometown, Isfahan. Here, the problem is to provide an integrated CDW management plan to allow managers to track it from the very beginning (generation) to very end (final disposal). We did the following process. That might be hint for you as well:
- A wide literature review and studying experiences of other similar cities
- Doing a broad study regarding the current situation (statistics, dumping site conditions, illegal procedures, current key players, etc).
- Developing a modified process in Isfahan Municipality
- Developing a system to help managers monitor the process
-Approval of required bills in city council
- Running a pilot in selected regions of the city
- Organizing the dumping site
Considering the market situation for recycled aggregate products
- Enforcing regulations for using recycled aggregates in constructions where applicable
- Preparing the situation for establishing a CDW recycling plant (especially concrete wastes to recycled aggregates).
I hope this could be useful for you.
  • asked a question related to Construction Engineering
Question
17 answers
Can you Share with us a world class achievement or a well known World recognized project in which you contributed or participated effectively in its success?
Relevant answer
As a method of the research we used Automated system-cognitive analysis (ASC-analysis), which is a new innovative method of artificial intelligence: it also has its own software tool – an intelligent system called "Eidos" (open source software) [1, 2, 3].
The Eidos-X++ system differs from other artificial intelligence systems in the following parameters:
- was developed in a universal setting, independent of the subject area. Therefore, it is universal and can be applied in many subject areas (http://lc.kubagro.ru/aidos/index.htm);
- is in full open free access (http://lc.kubagro.ru/aidos/_Aidos-X.htm), and with the relevant source texts (http://lc.kubagro.ru/__AIDOS-X.txt);
- is one of the first domestic systems of artificial intelligence of the personal level, i.e. it does not take special training in the field of technologies of artificial intelligence from the user (there is an act of introduction of system "Eidos" of 1987) (http://lc.kubagro.ru/aidos/aidos02/PR-4.htm);
- provides stable identification in a comparable form of strengh and direction of cause-effect relationships in incomplete noisy interdependent (nonlinear) data of very large dimension of numerical and non-numerical nature, measured in different types of scales (nominal, ordinal and numerical) and in different units of measurement (i.e. does not impose strict requirements to the data that can not be performed, and processes the data that is);
- contains a large number of local (supplied with the installation) and cloud educational and scientific applications (currently 31 and 199, respectively) (http://lc.kubagro.ru/aidos/Presentation_Aidos-online.pdf);
- provides multilingual interface support in 44 languages. Language databases are included in the installation and can be replenished automatically;
- supports on-line environment of knowledge accumulation and is widely used all over the world (http://aidos.byethost5.com/map5.php);
- the most time-consuming computationally, the operations of the synthesis models and implements recognition by using graphic processing unit (GPU) that some tasks can only support up to the solution of these tasks is several thousand times that really provides intelligent processing of big data, big information and big knowledge;
- provides transformation of the initial empirical data into information, and its knowledge and solution using this knowledge of classification problems, decision support and research of the subject area by studying its system-cognitive model, generating a very large number of tabular and graphical output forms (development of cognitive graphics), many of which have no analogues in other systems (examples of forms can be found in: http://lc.kubagro.ru/aidos/aidos18_LLS/aidos18_LLS.pdf);
- well imitates the human style of thinking: gives the results of the analysis, understandable to experts on the basis of their experience, intuition and professional competence.
  • asked a question related to Construction Engineering
Question
4 answers
I am a student at Ghulam Ishaq Khan Institute, Pakistan and I am conducting research on evaluating the barriers to adoption of industry 4.0 in the construction industry of developing countries with Pakistan as a case in point. You are requested to fill the questionnaire attached. It will take 15-20 minutes of your precious time. Your response will be highly acknowledged. The questionnaire is attached. Once the survey has been filled, kindly reply to this discussion with the updated response file.
Thanks
Relevant answer
Answer
  • asked a question related to Construction Engineering
Question
2 answers
To whom involved or have an experience in the Egyptian construction industry,
I would appreciate your participation in the survey of my PhD research for minimising waste in the Egyptian construction industry using the English or Arabic version through the following links:
English version:
Arabic version:
Thank you for you kind help in advance.
Relevant answer
Answer
Reuse, Reduce and Recycle.
  • asked a question related to Construction Engineering
Question
4 answers
I am working on developing fully pearlitic steels with fine interlamellar spacing. I am going to heat up samples to austenization temperature (1000 degC) at a heating rate of 10 degC per second and hold/soak it at austenization temperature for 10 min and cool it down to room temperature at 0.2 degC/sec. This is possible for lab scale samples. I would like to know if there are heat treatment methods for decreasing austenization holding time for thick and heavy samples around 500-800 kg to obtain fully pearlitic microstructure.
Relevant answer
Answer
Dear Muhammad,
The pearlite transformation involves the redistribution of carbon followed by a structure change, the martensite transformation involves the structure change alone, and, in contrast, the bainite transformation involves a structure change followed by the redistribution of carbon, which precipitates as a carbide. One of the research published by nature https://www.nature.com/articles/s41598-019-43623-7 claims that short soaking times for both quenching and partitioning stages, 10 s and 30 s, respectively, were employed in order to minimize or prevent carbide precipitation, as commercial grade rail steels, with low Si and residual Al contents, were used.
Although literature provides evidence that Si and or Al prevent or at least retard cementite precipitation, Kim et al.13 and Ariza et al.14 reported that even with high concentrations of Si (as high as 1.98 wt%), the formation of cementite was still observed. Toji et al.15also observed cementite precipitation in a high carbon steel, even though 2 wt. % Si was added to the chemical composition to prevent cementite formation. Allain et al. [16] studied the kinetics of carbon precipitation during the Q&P process using in situ High Energy X-Ray Diffraction and Transmission Electron Microscopy (TEM) techniques. They pointed out that at least 200 s are required at 400 °C for carbon redistribution, austenite reversion, and the formation of carbides.
The research artile also reported that the martensite is depleted in carbon in less than 0.1 s. However, about 10 s are needed to homogenize the carbon profile inside the austenite at 400 °C or 375 °C.
\One another literature provides the sample of research as:
Generally time required to transform eutectoid steel into austenite steel is 300C.
file:///C:/Users/3020/Cookies/Desktop/Downloads/A_model_for_austenitisation_of_hypoeutectoid_steel.pdf
A model for austenitisation of hypoeutectoid steels- There are few published models dealing with the transformation of eutectoid or hypoeutectoid steels with a starting microstructure which is a mixture of ferrite and pearlite. It is the logical to expect that the initiation of austenitisation in a hypoeutectoid steel is in pearlite, where the diffusion distances for carbon are small. Theory is Nucleation of austenite in pearlite colonies.
Third literature
Austenization is done at temperature 30-400C higher than the upper critical temperature of steel.
Hope it work out for you.
Ashish
  • asked a question related to Construction Engineering
Question
4 answers
Hello,
presently we are joining big (example 5 meter X 5 meter) laminates using bolts or some other aiding material etc etc. My question is how to join these big panels with zero radius. and if it is there what is the price?? Thank you in advance. Material is glass reinforced polyester laminates.
Relevant answer
Answer
I agree with A S Kaddour .
  • asked a question related to Construction Engineering
Question
8 answers
Could any one share real time examples for Start to Finish (SF), Start to Start (SS)and Finish to Finish (FF) dependencies?
Relevant answer
Answer
Start to Start: Wetting of sub-base and compaction of that in pavement engineering.
Finish to Finish: pure the concrete, test the concrete
For SF please see this link:
  • asked a question related to Construction Engineering
Question
15 answers
how to reduce shrinkage cracks while using OPC 53
Relevant answer
Answer
The best solution is to reduce the amount of mixing water by using a superplasticizer and also appropriate curing is helping a lot in reduction of shrinkage cracks.
  • asked a question related to Construction Engineering
Question
3 answers
Upon your site experience, when we use stud rails?
Relevant answer
Answer
In our project we are keeping stud rail in the railway truss top which will be connected PC Roadway span. In those PC roadway span we keep some hole where the stud rail can take place with some covering area. afterward concreting will be performed at those hole.
  • asked a question related to Construction Engineering
Question
15 answers
Upon your site experience, how can we repair the defect on beam due to steel corrosion?
Relevant answer
Answer
You may go through this paper for all the available corrosion protection techniques:
  • asked a question related to Construction Engineering
Question
3 answers
Upon your site experience, is it acceptable to make a join with ground beams?
Relevant answer
Answer
I have seen joins in some of the structure but the act was preferred to have a good foundation for the support.
  • asked a question related to Construction Engineering
Question
8 answers
Upon your site experience, what must done, if the consultant reject part form the work carried out by the contractor?
Relevant answer
Answer
If the reason for the rejection is based on a real scientific basis .and the error was simple and can be treated and did not affect the performance of structure in any way my opinion is that the contractor pay all costs for the difference and if the error is essential and can be repaired, I do the same procedure ... If it can not be repaired, the contractor should remove construction with paying all the costs and even those resulting from the delay of work.
  • asked a question related to Construction Engineering
Question
21 answers
Upon your site experience, How you can estimate the production date for cement in site, and if its expire or not?
Relevant answer
Answer
You can check the cement activity by compressive strength and its compliance with the declared class.
  • asked a question related to Construction Engineering
Question
5 answers
Upon your site experience, What is the main problems appear when concrete delay two hour during casting?
Relevant answer
Answer
The delay will impact greatly on workability and obviously compaction, but apparently very little on the compressive strength.
  • asked a question related to Construction Engineering
Question
3 answers
Upon your site experience, How can you repair the concrete defects on manhole walls?
Relevant answer
Answer
I did not design buildings.
  • asked a question related to Construction Engineering
Question
16 answers
Upon your site experience, What is the best time on the day for site concrete casting?
Relevant answer
Answer
In hot weather countries; in summer it is preferable to pour concrete at sunset and it is wrong to pour concrete at dawn or early morning; this procedure is not a substitute for the precautions for casting concrete in hot weather
In the winter, it is preferred to pour at dawn or early morning
  • asked a question related to Construction Engineering
Question
4 answers
1. Upon your site experience, What do you recommend for inclined column due to casting inaccuracy? And what the range of acceptance?
Relevant answer
Answer
Dear Sir,
You can refer to ACI 117
" Specification for Tolerances for Concrete Construction and Materials (ACI 117-10) and Commentary "
Also,
BS ISO 1803:1997
" Building construction. Tolerances. Expression of dimensional accuracy. Principles and terminology "
And
BS 5606:1990
" Guide to accuracy in building "
I hope that these specifications are good for your column case.
  • asked a question related to Construction Engineering
Question
4 answers
Upon your site experience, What are the main criteria need to be considered when design building against seismic?
Relevant answer
Answer
As written in:
SEISMIC DESIGN PRINCIPLES 
by Gabor Lorant
" The essence of successful seismic design is three-fold. First, the design team must take a multi-hazard approach towards design that accounts for the potential impacts of seismic forces as well as all the major hazards to which an area is vulnerable. Second, performance-based requirements, which may exceed the minimum life safety requirements of current seismic codes, must be established to respond appropriately to the threats and risks posed by natural hazards on the building's mission and occupants. Third, and as important as the others, because earthquake forces are dynamic and each building responds according to its own design complexity, it is essential that the design team work collaboratively and have a common understanding of the terms and methods used in the seismic design process. "
Also
"
SEISMIC DESIGN FACTORS
The following factors affect and are affected by the design of the building. It is important that the design team understands these factors and deal with them prudently in the design phase.
Torsion: Objects and buildings have a center of mass, a point by which the object (building) can be balanced without rotation occurring. If the mass is uniformly distributed then the geometric center of the floor and the center of mass may coincide. Uneven mass distribution will position the center of mass outside of the geometric center causing "torsion" generating stress concentrations. A certain amount of torsion is unavoidable in every building design. Symmetrical arrangement of masses, however, will result in balanced stiffness against either direction and keep torsion within a manageable range.
Damping: Buildings in general are poor resonators to dynamic shock and dissipate vibration by absorbing it. Damping is a rate at which natural vibration is absorbed.
Ductility: Ductility is the characteristic of a material (such as steel) to bend, flex, or move, but fails only after considerable deformation has occurred. Non-ductile materials (such as poorly reinforced concrete) fail abruptly by crumbling. Good ductility can be achieved with carefully detailed joints.
Strength and Stiffness: Strength is a property of a material to resist and bear applied forces within a safe limit. Stiffness of a material is a degree of resistance to deflection or drift (drift being a horizontal story-to-story relative displacement).
Building Configuration: This term defines a building's size and shape, and structural and nonstructural elements. Building configuration determines the way seismic forces are distributed within the structure, their relative magnitude, and problematic design concerns.
  • Regular Configuration buildings have Shear Walls or Moment-Resistant Frames or Braced Frames and generally have:
    • Low Height to Base Ratios
    • Equal Floor Heights
    • Symmetrical Plans
    • Uniform Sections and Elevations
    • Maximum Torsional Resistance
    • Short Spans and Redundancy
    • Direct Load Paths
  • Irregular Configuration buildings are those that differ from the "Regular" definition and have problematic stress concentrations and torsion."
  • asked a question related to Construction Engineering
Question
5 answers
Upon your site experience, What is the maximum storage time for cement in site?
Relevant answer
Answer
This really depends upon the type of cement and the conditions under which it is stored. At 20oC there should not be a problem so long as the relative humidity is maintained below 60%. Above this then there will be prehydration of the cement. This will lengthen the setting time and reduce strength development. If the relative humidity approaches 80% then the silicates in the cement will start to prehydrate and the loss in strength could well be ~30%.
At higher temperatures then it is likely that the effects will be more pronounced.
  • asked a question related to Construction Engineering
Question
7 answers
Finding Amount of delays (in civil construction engineering) its causes has become so much routine nowadays. What stops construction theory scientists from finding a solution for this problem ?
Obviously, for a complex problem, is complex solution is also expected. But I dont understand why this directions so much neglected.
Relevant answer
Answer
I believe that you can get better answer in the field. There are multiple companies that follow the practice in different forms like risk analysis, keeping buffers in project planning, developing WBS, detailed planning from L2 to L4 level and even more intense. For critical projects hourly planning is done and projects are also completed well before time... The actual delay of project may be very different for any two projects and hence same theory may not be applicable everywhere... Thats why in construction industry experience is given more weightage . And the reason of delay is project and location specific.
In actual field several MNC's have worked very well on this field. And they pay very handsome amount to their engineers to ensure it. They will not share that knowledge with every one since its their trade secret and their USP ro get future projects.
  • asked a question related to Construction Engineering
Question
5 answers
In China, entire metropolises are built according to the plan of sustainable smart cities. An example is Shenzen, which over 30 years ago was a small village and is now a modern metropolis. In addition, other cities of this type are planned to be built from scratch in the next 30 years. Some of these metropolises, which are currently planned for construction, are to be almost completely autonomous in terms of energy and in terms of food supply. These new pro-ecological metropolises, planned as smart city cities, contain many greenery and include crop fields and solar power plants at the periphery.
Please reply
Best wishes
Relevant answer
Answer
  • asked a question related to Construction Engineering
Question
6 answers
please provide some information about new materials and technique for lightweight concrete(less than 500kg/m3 density) production.
Relevant answer
Answer
Ytong have commercialized autocalved aerated bricks having density of 340 kg/m³ for load bearing structure. There is a product called Multipor having density of 115 kg/m³ for thermal insulation.
We are curretly planning to use particle stabilization strategy to prepare foam concrete, using silica fume as foam stabilizer to see if we can make the density lower.
  • asked a question related to Construction Engineering
Question
2 answers
Seismic Design: How can I perform rigorously the SAP/ETABS analysis of the building constructed using "interlocking bricks technology"?
Relevant answer
Answer
Hussam Ali Mohammed Modeling each brick with its proper dimensions and properties as 3D solid can only develop the reasonable structural analysis model. I found in different literature about modeling it as strut elements, or creating different scenarios of load only, wall only, wall in one plane -load in another plane, etc. but could not get a good way to model it. However, apart from being cumbersome and time-consuming, modeling it as a 3D solid is only the best way I thought.
I have not been following since last three years if there are new thoughts on this. Let me know if you have found/will find any.
Thanks.
  • asked a question related to Construction Engineering
Question
12 answers
Theoretically, what is the main stresses created on new concrete cast over old one, that might effect its bond?
Relevant answer
Answer
Concrete compressive strength
  • asked a question related to Construction Engineering
Question
22 answers
Upon your experience, what is the best material to connect new concrete over an old already cast?
If you have any data regarding these materials.... please share...
Relevant answer
Answer
Additon HE or SIKA
  • asked a question related to Construction Engineering
Question
15 answers
I'm looking for the ratios of cement : sand : aggregates + water.
Please reply by referring valid references.
Relevant answer
Answer
Dear, the mix design depends mainly on the properties of materials which is variable. Based on my experiance, the following mix can show 40 MPa strength. 1:1.5:2.75, w/c ratio 0,4.
  • asked a question related to Construction Engineering
Question
4 answers
I want to assign the properties of brick, mortar and interface in the modelling of an unreinforced masonry wall.
Relevant answer
Answer
  • If you perform an experimental program then you can derive the parameters from the test results, else you have to look for standards/references/articles...etc. in order to get the material properties.
  • For the interface you can create a CZM material with Contact debonding parameters.
  • asked a question related to Construction Engineering
Question
132 answers
Technical question about the possibility of replacing construction fine aggregate by river sand or desert sand...?
Relevant answer
Answer
Dear Faysal Asad .. Thanks for answering..
  • asked a question related to Construction Engineering
Question
15 answers
Technically, how can we stop leakage started on a basement due to increasing water table outside the building?
Relevant answer
Answer
The problem is great and I think the best solution is to reduce the level of groundwater. This can be done by digging wells around the building to prevent the groundwater from flowing into the site and then withdraw it by sucking pumps. Or it is possible to solve the problem using special liquids that freeze the water inside the soil, but this process needs time and high costs.
  • asked a question related to Construction Engineering
Question
12 answers
Years passed from first time using the finite element method to simulate almost all cases within a recommendation that its fit to predict a similar behavior of the experimental programs, .. What did you think upon your opinion...?
Relevant answer
Answer
The first step is compare with the experimental test results, after that you can decide if you can depend on the finite element results or not.
  • asked a question related to Construction Engineering
Question
5 answers
Do you have any studies backing up estimation of percent damages to structural components of residential houses or buildings in general?
Relevant answer
Answer
Must have field experience
  • asked a question related to Construction Engineering
Question
9 answers
Major question.. give me your logical definition and whats the deference in application....
Relevant answer
Answer
Dear TIZA MICHAEL TORYILA ... Thanks for joining our discussion..
  • asked a question related to Construction Engineering
Question
33 answers
Based on your experience, how can I maintain quality construction, while constructing building?
Relevant answer
Answer
Dear Tim Belden .. thanks for answering..
  • asked a question related to Construction Engineering
Question
33 answers
Upon your experience.. in construction material.. can we
re-used the reinforcement extracted from demolition of a building for the construction of a new building?
Relevant answer
Answer
Dear Kolawole Afolabi ... Thanks for answering...
  • asked a question related to Construction Engineering
Question
15 answers
Based on your experience.. want building to be look like they are part from nature...
Relevant answer
Answer
Dear Eric Gelinas .. thanks for answering.. Agree with you
  • asked a question related to Construction Engineering
Question
21 answers
In details ... need to know What is a work environment plan?
Relevant answer
Answer
Dear Djaafar Zemali .. thanks for answering and sharing your opinion ..
  • asked a question related to Construction Engineering
Question
10 answers
Upon your site experience and works, can you define the geopolymer concrete, ....
Relevant answer
Answer
Dear Mushtaque AHMED Pathan ... thanks for answering..
  • asked a question related to Construction Engineering
Question
5 answers
I have the test in laboratory on a shake table and I would like to use the Fourier spectra to identify the fundamental period of vibration.
Relevant answer
Answer
You can use this FREE software to calculate it. The software is called PRISM.
Watch this tutorial about this software:
  • asked a question related to Construction Engineering
Question
8 answers
From your structural point of view and experience, what is the largest span lengths can be achieved with hollowcore plank systems?
Relevant answer
Answer
Dear Alaa Alsaad ... thanks for answering and for the drawing...
Its really very good to achieve 15m span, ... Do you have some pics that can posted her, .. because achieving largest span is really a challenge..
  • asked a question related to Construction Engineering
Question
19 answers
With increase using of precast concrete members, ... can its damaged units reused...?
Relevant answer
Answer
Dear Arturo E Schultz .. thanks for answering ... and for references ... I really appreciate..
  • asked a question related to Construction Engineering
Question
6 answers
In practical, does it common practice to weld alternate ends for hollow core precast system.... need your opinion ?
Relevant answer
Answer
The ends of the plank's should not necessarily be welded,but rather be made to rest on support like beam and the beam is rebar and cast in- situ hold the ends. Please always ensure that the plank's length is designed to span between the available support.
  • asked a question related to Construction Engineering
Question
14 answers
Late in 2012, the coastal town of Lynn, Mass., petitioned Marinetek, a Finland-based manufacturer of harbor products, to replace its aging dock systems located within the town’s seaport marina. An important question for both the town and contractor became, “Which solution will provide the durability and functionality necessary to withstand the elements and get the job done right?”
Relevant answer
Answer
The precast prestresses concrete structures with high strength of concrete can be designed in such a way that resulting stresses remain compressive through out the depth of the section. Thereby we can ensure that there is no tensile stress and no crack at all. Possiblility of ingress of hostile ions can be prevented for much longer time and also corrosion can be prevented.
Performance based designed of concrete is another area wherein precast concrete can be designed for intended performance.
  • asked a question related to Construction Engineering
Question
32 answers
Its a technical question..
Relevant answer
Answer
It depends on local standards and codes. Much steel is welded in to grid patterns for light weight constructions like wire and light bars. Heavier steel like rebar is usually tied which allows some movement with temperature changes.
Welding heavier parts is possible, but must be made more secure than a tack weld if the parts are quiet heavy and will be put through daily temperature cycles before the concrete is poured.. Also corrosion resistance is important and sometimes compromised by welding. A zinc compound is available but not as good as galvanizing or other hot passivation.
  • asked a question related to Construction Engineering
Question
16 answers
Within the wide use of precast concrete technology... does the precast concrete considered energy efficient?
Relevant answer
Answer
Dear Anil Kumar Thakur ... Thanks for answering..
So did you think that precast concrete could be considered energy efficient?
  • asked a question related to Construction Engineering
Question
21 answers
Concrete performance actually improves when several common industrial by products are added, so what are the recycling possibilities for precast concrete manufacturing?
Relevant answer
Answer
No problem Hussam.
All the the best with your research.
  • asked a question related to Construction Engineering
Question
8 answers
Of course many question such as that were around back in 1980 when I first wrote How Designers Think. But then we had little evidence about the actual practice of design and about how the skills are acquired both academically and professionally. We had a very limited understanding of the nature of design problems. We knew design was a simultaneously frustrating and yet intellectually rewarding occupation, but we had little