Ali Akbar Shirzadi Javid

Iran University of Science and Technology · School of Civil Engineering

The rising complexity of construction projects and the industry’s commitment to sustainable practices have driven the extensive adoption of Building Information Modeling (BIM) technology. A core function of BIM is the early identification and resolution of clashes during the design phase, which serves to mitigate costly rework and delays in the con...

In this research, by using the genetic algorithm, which is a type of meta heuristic algorithms, the optimal number of wharfs is calculated based on the number of existing ships, the profit from the export and import of iron ore, and the waiting time. The best chromosome of each generation is classified according to the maximum amount of profit obta...

Considering the increasing need for optimal use of water resources, using types of waste water instead of part of the water for making concrete and also reducing the use of potable water in concrete is particularly important, especially in developing countries. Accordingly, this study aimed to investigate and reinforce using greywater as a potentia...

Given the increasing need for design coupled with constrained financial resources, a comprehensive approach that combines life cycle assessment (LCA), life cycle cost analysis (LCCA), and multi-dimensional optimization was suggested to develop a decision-making framework for cost-effective buildings. The proposed framework considers various aspects...

This study aims to investigate the effect of the temperature of the self-consolidating concrete (SCC) mixture during casting on fresh and hardened properties for two types of SCC. Also, the rheological properties of the mixtures were assessed at specific time intervals (0, 20 and 40 min after mixing) to determine their sensitivity to changes in mix...

This study explores the intricate integration and synchronization of supplier selection with the optimal scheduling of multi-mode resource-constrained projects, which is a genuine and complex challenge prevalent in the construction industry, by proposing new multi-objective mathematical modeling considering various items. Within this context, a mul...

Purpose In traditional Bayesian belief networks (BBNs), a large amount of data are required to complete network parameters, which makes it impractical. In addition, no systematic method has been used to create the structure of the BBN. The aims of this study are to: (1) decrease the number of questions and time and effort required for completing th...

Building information modeling (BIM) has recently improved design and project execution quality and resolved clashes. One of the most essential and challenging tasks in construction projects is resolving clashes in the design phase. If clash resolution is not addressed on time, construction projects’ cost, time, and quality will be hurt. Thus, this...

This study developed an innovative device, “IoT Corr,” to monitor rebar corrosion’s physical and chemical characteristics in concrete. A corrosion potential sensor (solid-phase pseudo-reference electrode) and a resistance pressure sensor printed with a 3D printer utilizing Internet of Things (IoT) technology were employed for the device’s developme...

Corrosion of reinforcing bars in reinforced concrete structures due to chloride attack in environments containing chloride ions is one of the most important factors in the destruction of concrete structures. According to the abundant reports that the corrosion rate around the repair area has increased due to the macro-cell current known as the inci...

In the construction industry, material handling plays an important role. Finding proper locations for construction facilities not only can affect the expenses, but also it can impact on the process of handling of construction materials. Therefore, in order to supply engineering demands and materials, the construction site layout planning problem (C...

After water, concrete is the most widely used substance on the planet. Carbonation of cementitious materials is an inevitable process through which concrete compositions react with carbon dioxide. Carbonation leads to rebar corrosion in reinforced concrete (RC) structures, reducing structures’ longevity. This process increases cement production, fo...

In this study, the multi-mode resource-constrained multi-project scheduling problems (MMRCMPSPs) considering supply management and sustainable approach in the construction industry under uncertain conditions have been investigated using evidence theory to mathematical modeling and solving by multi-objective optimization algorithms. In this regard,...

There is an increasing tendency toward using construction waste in concrete production, including old buildings’ recycled concrete. This article examines the effect of the quantity and quality of old concrete recycled aggregate on the mechanical properties of concrete. Thus, we used concrete with water–cement ratios of 0.37, 0.45, and 0.55 to produ...

This paper presents an experimental study on the relationship between the packing density of solid particles and the workability and rheology of self-consolidating concrete (SCC). The rheological properties of SCC mixtures were measured by a coaxial rheometer (of the ICAR type, which is the most advanced technology in calculating rheological proper...

The use of pozzolans as cement substitutes has become widespread in concrete technology in recent years. This is due to the improvement of concrete properties as well as from the perspective of sustainable development and reduction of cement consumption. In this study, the effect of 45% ground granulated blast furnace slag, 7% silica fume, 35% fly...

With the Architecture, Engineering, and Construction industry representing a significant share of global energy consumption and greenhouse gas emissions, developing sustainable design and reducing buildings’ environmental impacts has become a priority over the past decades. Adopting building information modeling tools and implementing them into lif...

In the last decades, various test methods have been developed to evaluate the resistance of concrete against chloride penetration. This study investigated twelve types of concrete to determine which test method is reliable for ranking concretes. The concrete evaluation included different water to binder ratios (w/b) of 0.4, 0.45, and 0.50 with and...

The long-term characteristics and durability of alkali-activated mortars based on waste glass are crucial to better understand their performance in aggressive environments. In this regard, the performance of waste glass as a building material and its characteristics such as mechanical (compressive, flexural, and tensile strengths), durability (chlo...

Building Information Modelling (BIM) has created a fundamental change in the field of designing and management of construction projects. Due to the visual and parametric capabilities of BIM, it improves the efficiency of the task. In the design phases, the BIM drawings and plans prepared by individual designers, are integrated and reviewed in a fed...

Design coordination and clash detection are the most common and appreciated applications of three-dimensional modeling (3D modeling). In some projects, millions of clashes are detected including a large number of irrelevant clashes. The purpose of this research is to determine the priority of resolving clashes before the construction phase. In this...

In this study, two types of latex, Styrene–Butadiene Rubber (SBR) and Poly-Vinyl Acetate (PVA) were used as repair materials, and their various properties were examined. The assessments utilised Latex Modified Concrete (LMC) in ratios of 10%, 15%, and 20% to the weight of cement to investigate the properties of fresh and hardened concrete. The mech...

Concrete is the most utilized human-made material that has been used in the construction industry. The global concrete demand is rapidly increasing, and accordingly, designing green and sustainable concretes is of great concern. This study aims to optimize the mixture proportion of green and sustainable concretes. In this regard, concrete functiona...

In this study, slag-based geopolymer concretes, including partial dosages of pumice and silica fume, are employed as repair materials for deteriorated concrete pavements. Pumice and Silica fume were used to improve the fresh properties of geopolymer concrete, specifically the setting time. In this regard, a series of mixtures were prepared with 0%,...

The increase in the corrosion rate around a repair area caused by the formation of a galvanic cell between the substrate concrete and the repair mortar is known as the incipient anode. The current study is aimed at investigating the effects of repair dimensions on the corrosion rate of the macrocell created by the patch repair. To do so, repair sla...

In this study, the effects of supplementary cementitious materials with changes in the structure of the concrete pores have been examined on the coefficient of thermal expansion (CTE) at different ages. The results indicated a descending trend for the CTE of the reference concrete up to 60 days (diminishing by about 12%), after which it remained co...

Geopolymers are known as ecofriendly materials because of their low CO2 emissions and waste materials that could be used in their fabrication. In this paper, pumice is used as a raw material obtained from volcanic ashes to produce a sustainable mortar. For this purpose, the effects of sodium oxide concentration (Na2O%) and silica modulus (MS) on th...

In reinforced concrete structures, the increase in the corrosion rate in the vicinity of the repair zone, due to galvanic cell formation, is known as the incipient anode effect. This study aims to investigate the effect of different repair mortars on the controlling factors of macro-cell corrosion current, induced by patch repair. Therefore, slab s...

This paper investigates the effects of metakaolin and pumice pozzolans as replacement cementitious materials with Portland cement in conventional concrete (NC) on compressive strength, permeability properties, chloride penetration resistance under immersion and tidal conditions, as well as chemical resistance to simulated acid rain attacks in concr...

The increase in the corrosion rate around a repair area caused by the formation of a galvanic cell between the substrate concrete and the repair mortar is known as the incipient anode. The current study is aimed at investigating the effects of repair dimensions on the corrosion rate of the macrocell created by the patch repair. To do so, repair sla...

In this study, the effect of using crumb rubber and recycled aggregates on the mechanical properties of concrete has been evaluated as areplacement of fine and coarse aggregates In order to add the admixtures and evaluate their combined effect, 20 different types of concrete mixture ratio were prepared. The results indicated that in those samples c...

This investigation focused on the effect of nanoparticles on microstructural surface characteristics, abrasion, and skid resistance of concrete pavements. Firstly, the percentage of optimal replacement of nanoparticles was determined. In the second part, the nano-modified concrete similar to mortars in terms of water-to-cement and sand-to-cement ra...

Concrete durability enhancement plays a crucial role in the function of structures located in the Persian Gulf environment. In this study, the durability performance of self-consolidating samples (concretes and mortars) blended with Silica fume, natural zeolite, and limestone powder in the form of ternary or quaternary mixtures located in the simul...

The mixing process performs a critical role in the concrete microstructure, which defines the final product’s quality. Optimizing mixing time and mixing speed during the mixing process can reduce the unit price and energy consumption without impacting product quality. Furthermore, the energy consumption to manufacture self-consolidating concretes (...

Utilizing surface protection materials with high barrier properties and hydrophobicity is a method for concrete protection to extend its lifetime. This paper aims to investigate whether graphene oxide (GO) can be applied as surface protection of concrete to prevent the transmission of water and ingress of chloride ions. The best method for applying...

Change in the concrete temperature causes the expansion of the concrete to become tensile stress especially in structures such as concrete pavements which are long. Length change in concrete structures is caused by thermal change is related to length, change in temperature, and coefficient of thermal expansion (CTE) of concrete. The risk of concret...

The aim of this study is to investigate the mechanical and durability properties of the self-consolidating concrete (SCC) containing fine sand as filler and two types of pozzolan including metakaolin and zeolite. The limestone filler of the reference SCC is replaced by fine sand, and also partial substitution of 10% and 15% of ordinary Portland cem...

Designing the optimal mixture proportion of concrete pavements has been a significant concern. Classical methods are not proficient to spot the optimal mixture design, and they may not consider all of the vital characteristics. Hence, in this investigation, a novel method is developed to predict the optimal mixture proportion, which enhances fundam...

Setting time and thixotropy of self-consolidating concrete (SCC) mixtures are two important parameters that affect the early age properties. In order to determine these parameters, there are traditional methods that have advantages and disadvantages such as low accuracy or high cost of testing. The aim of this study is introducing an acceptable met...

Setting time and rheology of mixtures are among the most important features in new generation concretes such as self-consolidating concrete (SCC) and can have a great impact on the behavior of fresh concrete. Therefore, introducing new methods for determining these parameters has always been one of the main concerns. In this research, we tried to d...

In this paper, effects of natural pozzolan, called Chekneh, as a part of cement replacement and wood chips as a part of mixture aggregates on the mechanical and durability properties of concrete were studied. Nine concrete mixtures proportions within two categories were prepared. In the first category, the properties of concrete were evaluated by a...

This paper is an attempt to explore the barriers to integrating sustainability into construction project management in developing countries. To this end, a comprehensive review of the literature is conducted, as a result of which a list of 30 barriers is culled from existing studies. The list of barriers is subsequently assessed in terms of relativ...

In this study, the effective factors on bond strength of ten self-consolidating concrete (SCC) mixtures were investigated using different amounts of cement, water to cement ratio and cement replacing materials (silica fume and metakaolin). These factors include roughness of the base concrete, thixotropy and packing density, and how they affect bond...

Several studies have been done on the rheological properties and setting time of cementitious mixes, but the relationship between these two important features has not been studied so far. Therefore, the aim of this study is to investigate the relationship between rheological properties and setting time in self-consolidating concrete mixtures. In th...

Several studies have been done on the rheological properties and setting time of cementitious mixes, but the relationship between these two important features has not been studied so far. Therefore, the aim of this study is to investigate the relationship between rheological properties and setting time in self-consolidating concrete mixtures. In th...

In this study, the effects of spraying nanoparticles with different geometries (nano-SiO2, nano-halloysite, and nano-montmorillonite) on surface characteristics of concrete pavement in terms of microstructure. The initial and final setting times of mixtures were determined to investigate the proper spraying time for applying on the pavement surface...

The aim of this experimental investigation is to study the effect of siliceous particle at nano (0, 1, and 2% of pyrogenic nanosilica), micro (silica fume with 0, 5, and 10% cement weight replacement), and macro scales (sand with SiO2 percentages of 0, 50 and 100%) on mechanical properties, durability, and surface characteristics of self-consolidat...

Self-consolidating concrete (SCC), despite its many positive advantages, increases the formwork lateral pressure of the mixture due to its high fluidity, leading to the increased cost of formwork construction in the in situ concrete structures. The thixotropy property, as the most significant functional feature including the effect of mixture propo...

Achieving a concrete mix design has always been one of the major challenges in the industry. There are several ways to achieve a concrete mix design, but most of these methods always consider only the compressive strength of the concrete. Due to the need to control the cost of projects and economic issues, new methods are needed to achieve the desi...

Chloride ion has the highest proportion of chemical compounds present in seawater. This research utilized the chloride curing conditions in order to study the effect of chloride ion on properties of concrete containing zeolite as a mineral admixture and micro-nano-bubble water. The objective was to improve the durability and the mechanical properti...

This paper presents an experimental research on effects of micro-nano bubble water and mineral admixtures (zeolite and Chekneh pozzolans) on the mechanical and durability properties of concrete. In this study, 18 types of mixtures including 3 categories of conventional concrete were prepared. The first category was a mixture containing just one typ...

This paper presents an experimental study on fresh and hardened properties of nonautoclaved aerated concrete (NAAC) mixtures. It also attempts to address a new method to determine the packing density and air percentage of NAAC mixtures. Different types of NAAC mixtures with various aluminum powder percentages and water-to-cement ratios were made. R...

عنوان فارسی مقاله : پارامترهای مؤثر بر خوردگی آرماتورها در تعمیرات موضعی سازه‌های بتنی | چکیده : شواهدی مبنی بر تغییر در نرخ خوردگی آرماتور در نواحی تعمیر شده به روش تعمیر موضعی گزارش شده است که در خصوص علل آن اطلاعات چندانی در دست نیست. حال با توجه به این پدیده، در این مقاله مبانی الکتروشیمیایی پارامترهای خوردگی در نواحی تعمیری بررسی شده است. در ب...

عنوان فارسی مقاله : بررسی عوامل مؤثر بر نگهداری و تعمیر تأسیسات بیمارستان‌ها | چکیده : تأسیسات بیمارستانی در عرصه بهداشت و درمان از اهمیت زیادی برخوردار می‌باشند، زیرا بخش زیادی از هزینه‌های ساخت یک بیمارستان به تأسیسات برقی، مکانیکی، تجهیزات و وسایل پزشکی اختصاص می‌یابد. در این میان با توجه به هزینه‌بری امر درمان به‌ویژه احداث و نگهداری تأسیسات مک...

This paper presents an experimental research on the relation between methods of surface preparation and mechanical properties of concrete pavements containing cement replacement admixtures. It also tries to evaluate the effect of various weather conditions (cold, normal, and hot) on the mechanical properties. Nine types of mixtures including conven...

Plastic shrinkage occurs in fresh concrete usually within few hours after mixing the concrete and risk of its cracks endangered concrete structures especially in the elements with high surface to volume ratio such as slabs or highway pavement. An experimental investigation on capillary pore pressure, tensile strength and plastic shrinkage of concre...

In this study, the corrosion resistance of square and rectangular concrete cubes is evaluated and the correlation between the corrosion and the concrete compressive strength reduction is examined. Concrete specimens with different admixtures were prepared and exposed to accelerated corrosion, and the compressive-strength reduction coefficients of t...

An experimental investigation on capillary pore pressure, tensile strength and plastic shrinkage of self-consolidating concrete (SCC) is presented here. The aim of research is to study the relation between capillary pore pressure build up in concretes, early age tensile strength and plastic shrinkage strain. Capillary pore pressure apparatus was cr...

Concrete pavement have received increasing attention for a number of reasons, including high rigidity, excellent fatigue behavior, long life, and economic and environmental cost-effectiveness. High surface to volume ratio in these procedures is one of the hazards that threatens these pavements is plastic shrinkage and the resulting cracks. In this...

The present study developed a new method for determination of cement and concrete setting times. The disadvantage of current methods is that most only determine setting time of either cement or concrete and cannot determine the setting time of all types of concrete and cement, especially those containing mineral admixtures. In the proposed method,...

Concrete mix proportioning could be referred to the process of determining the quantities of concrete ingredients using local materials to achieve specific characteristics of the concrete. Among the most important parameters affecting the performance of concrete are the packing density and the grading curve of the aggregates. Better packing of aggr...

در بتن مسلح، قبل از وقوع خوردگی فرض پیوستگی کامل بین بتن و فولاد در طراحی پذیرفته شده می باشد. تخریب لایه محافظ اطراف آرماتور و تشکیل لایه زنگ روی آرماتور به دلیل وقوع خوردگی، مقاومت پیوستگی را تا حد زیادی تحت تاثیر قرار می دهد. در این تحقیق، اثرات خوردگی آرماتورها بر میزان پیوستگی بین بتن و آرماتور در سطوح مختلف خوردگی، با ساخت نمونه های با نسبت آ...

This paper presents an experimental study on the influence of packing density of solid particles on the stability and rheology of self-consolidating concrete (SCC). Also it is tried to address a new method for determination the packing density of SCC mixtures. Seven powder-types of SCC mixtures with different packing density were made with inclusio...

The experimental investigation on plastic shrinkage and plastic settlement for different self-consolidating concrete (SCC) mixtures as repairing materials is presented. The concrete mixtures were placed on the surface of the concrete substrate slabs at different restraint degrees. Four different types of repairing materials such as plain SCC, SCC w...

One of the most challenging problems that can confront a repair engineer is that the completed structure is a monolithic mass that is free from cracks, especially with regard to the plastic shrinkage cracking in concrete flatwork. The more roughness in the surface of substrate, there will be more bond strength between substrate and repair overlay....

Restraint conditions and reinforcing bars are important factors for plastic shrinkage performance of concretes. The results of laboratory investigation reported herein concerns the influence of the restraints conditions and embedded steel on restrained strain plastic shrinkage of self-consolidating concrete(SCC) as repair material . The results sho...

A project must complete in predetermined time and quality according to limited budget. Therefore the risk management of project is very important to succeed in project. One of the most important steps in risk management process is identifying risk factors of a project. In this study, the important risk factors are categorized into two main groups a...