Piotr Jaskowski

Piotr Jaskowski
Lublin University of Technology · Department of Construction Management and Methods, Faculty of Civil Engineering and Architecture

dr hab. inż.

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59
Publications
22,137
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659
Citations

Publications

Publications (59)
Article
Full-text available
One of the main issues of construction scheduling is harmonizing the work of crews that perform repetitive processes. The schedules determine the resource flow and the efficiency of the construction stage. Traditional scheduling tools are not suitable for repetitive projects. Therefore, the authors put forward a deterministic method for harmonizing...
Article
Full-text available
Construction projects that involve repetitive operations are often referred to as repetitive construction projects. Scheduling them proves a task more demanding than in the case of projects in other industries. Typical objectives of optimization, a characteristic set of constraints, as well as the schedule’s susceptibility to the propagation of dis...
Article
Full-text available
The authors put forward a concept of a method to support workforce demand planning intended for construction contractors. The construction business suffers from shortages of skilled labor. The method facilitates analyzing the possibilities of project-to project resource sharing and uncertainties in the flow of new orders, both characteristics of co...
Article
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W artykule zaproponowano metodę optymalizacji trójkryterialnej harmonogramów powtarzalnych procesów budowlanych. Ze względu na trudności w projektowaniu realizacji tego typu przedsięwzięć z wykorzystaniem klasycznych narzędzi i metod zaproponowano wykorzystanie algorytmów rojowych do znajdowania niezdominowanych rozwiązań problemu. Zaprezentowano t...
Article
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The problem of setting prices for construction works is significant for both the investor and contractor companies. The periodically occurring instabilities in the economy require investment process participants to perform detailed market analyses and assessments, as well as to monitor price forecasts in construction. It is only after such an asses...
Article
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In the literature on the scheduling of construction projects it is difficult to find a justification for adopting the criteria for evaluating work schedules based explicitly on the preferences of those who develop them. This article tries to fill this gap and provide information on the preferences of construction site managers for sustainable sched...
Article
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A variety of schedule compression techniques are used to get delayed construction projects ``back on tracks''. This paper presents a new optimization approach to schedule crashing by relocating some of the workers from non-critical to critical processes (changing composition of crews using the initial pool of workers) and employing additional resou...
Article
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Both the construction clients and the contractors want their projects delivered on time. Construction schedules, usually tight from the beginning, tend to expire as the progress of works is disturbed by materializing risks. As consequence, the project’s original milestones are delayed. To protect the due date and, at the same time, avoid changes to...
Conference Paper
Full-text available
Project managers strive to reduce the capital project execution times. Project owners typically insists on quick delivery for financial benefits of early occupation of the built facility (commercial projects), or for reducing public dissatisfaction caused by the works (public projects like road repairs). Construction and civil projects are notoriou...
Article
Full-text available
The highest degree of construction works harmonization can be achieved when planning a repetitive project with processes replicated many times in work zones of identical size. In practice, structural considerations affect the way of dividing the object under construction into zones differing in terms of scope and quantity of works. Due to this fact...
Article
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A significant number of construction projects involve repetitive processes. Planning them occurs to be a complex task. Network methods traditionally applied to construction scheduling prove inefficient in the case of Repetitive Construction Projects (RCPs) due to the increased number of relationships between processes, locations (units) and resourc...
Conference Paper
Full-text available
In carrying out construction projects, enterprises strive to obtain the highest degree of harmonization of the work of the resources involved. It is manifested in ensuring continuous and regular production with a full usage of their executive potential. The purpose of harmonization is to eliminate unjustified interruptions in the work of resources....
Article
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Most construction projects involve subcontracting some work packages. A subcontractor is employed on the basis of their bid as well as according to their availability. A viable schedule must account for resource availability constraints. These resources (e.g. crews, subcontractors) engage in many projects, so they become at the disposal for a new p...
Article
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The Monte Carlo simulation has become a standard tool in the practice of planning risk-affected projects. In particular, it is frequently applied to testing the impact of risk on schedule networks with deterministic structures and random activity durations defined by distribution functions of any type. The accuracy of simulation-based estimates can...
Article
The selection of suppliers is one of the key issues of supply logistics of any business entity. Due to the globalization of the economy and the rapid technological progress, the choice of products and the number of vendors is growing, which makes the selection process difficult. The specific character of the construction projects (one-off contracts...
Article
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The approach used by construction companies to determine bid prices is an element of their strategy used to win jobs in competitive tenders. Such strategies build upon an analysis of the contactor’s potential and capabilities (am I able to deliver? am I eligible to participate in the tender?), and the analysis of the economic environment, including...
Article
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This study adopts the flow shop concept used in industrial production to schedule repetitive non-linear construction projects, where specialized groups of workers execute processes in work zones (buildings) in a predefined order common to all groups. This problem is characteristic of construction projects that involve erecting multiple buildings. A...
Article
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A competitive tender with the lowest price as the only (or the main) criterion of contractor selection is one of the most common approaches to procurement in construction. On the one hand, it is expected to offer the greatest benefits of competition to the client; on the other hand, it forces numerous competitors to engage time and resources for bi...
Article
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The continuous growth of competition on the construction market results in the fact that construction companies are forced to keep searching for solutions facilitating the building process and construction logistics. In the recent decades, one of the most fascinating ideas which enable a real improvement in the aspect of a company's competitiveness...
Article
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Authors put forward a mixed linear programming model for optimizing supplies of construction material consumed in non-uniform way. The model enables the user to consider cost implications of material substitution and selecting suppliers that offer the material at varying level of pre-process-ing, as well as buying to stock with limited capacity of...
Article
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Renewable resource levelling is the core of the scheduling process. A perfect schedule ensures that resource supply corresponds to the demand at every unit of project time. A classic approach to resource levelling in schedules with predefined project completion dates consists in manipulating processes start dates. Resource deployment can be also im...
Article
Material supply-related decisions strongly affect economic performance of construction projects. To facilitate planning, the authors put forward a mixed integer linear programming model for optimizing supplies of materials or components that are consumed irregularly. The model's objective function is minimizing the total inventory management cost....
Article
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The selection of a general contractor for construction works is one of the most important decisions made throughout the entire construction project. It may be decisive in the success or failure of the project (e.g. delays in the commissioning of works, exceeding the budget, low quality of works). The article presents a method for supporting group d...
Article
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Experience and business intuition of a contractor are often insufficient to ensure that tender procedures will provide a good trade-off between the cost of bid preparation and the benefit of a high probability of winning a money-making contract. The authors put forward a set of decision-support models: a multi-criteria analysis for assessing the de...
Article
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Many civil engineering projects involve sets of tasks repeated in a predefined sequence in a number of work areas along a particular route. A useful graphical representation of schedules of such projects is time-distance diagrams that clearly show what process is conducted at a particular point of time and in particular location. With repetitive ta...
Article
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Subcontracting has been a worldwide practice in the construction industry. It enables the construction enterprises to focus on their core competences and, at the same time, it makes complex project possible to be delivered. Since general contractors bear full responsibility for the works carried out by their subcontractors, it is their task and the...
Article
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Realizując przedsięwzięcia budowlane, przedsiębiorstwa dążą do uzyskania największego stopnia harmonizacji pracy angażowanych zasobów, co przejawia się w zapewnieniu ciągłej i równomiernej produkcji przy pełnym wykorzystaniu ich potencjału wykonawczego. W artykule jest analizowany problem harmonizacji pracy brygad generalnego wykonawcy, realizujący...
Article
Full-text available
The authors aim to provide a set of tools to facilitate the main stages of the competitive bidding process for construction contractors. These involve 1) deciding whether to bid, 2) calculating the total price, and 3) breaking down the total price into the items of the bill of quantities or the schedule of payments to optimise contractor cash flows...
Article
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Production rates for various activities and overall construction project duration are significantly influenced by crew formation. Crews are composed of available renewable resources. Construction companies tend to reduce the number of permanent employees, which reduces fixed costs, but at the same time limits production capacity. Therefore, constru...
Article
A choice of a subcontractor may have critical impact on realization of the project, it has influence on the cost, duration, and quality. Selection of the best sucontractor can be defined as multiple criteria decision making problem (MCDM) of choosing a proper offer from set of alternatives evaluated by using set of criteria. Decision maker should d...
Article
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A formwork is a structure used to contain poured concrete and to mold it to the required dimensions. Different formwork systems provide a wide range of concrete construction solutions that can be chosen to suit the needs of a particular structure. The selection of panels and the design of the formwork layout for concrete structures, especially if t...
Article
Efficiency of road works is conditioned by selection of machines and synchronizing their operations. Modelling these works using queuing theory allows the planner to conduct an in-depth analysis of the system’s operation to find the best machine types and their optimal number. For simple cases, analytic formulas are used to calculate such parameter...
Article
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Construction projects consist in providing new built facilities as well as in maintaining the existing building stock. Reliability engineering in construction encompasses all stages of the structure's life cycle from the earliest concept of the project to decommissioning. The project planning and design stages are aimed at selecting or creating tec...
Article
The authors’ recent survey on Polish road contractors’ aggregate procurement methods indicates that optimization techniques are rarely used in practice – despite the fact that the material is to be transported from large distances and its sources are inconveniently distributed throughout the country. In search for economy in this respect, the autho...
Article
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The assignment problem consists of allocating renewable resources (construction equipment, crews, or contractors) of limited availability to a set of activities. The classical model for this problem minimizes the total time or cost of completing all activities with the assumption that each activity is assigned to one particular resource. This paper...
Article
Planning formwork (selecting systems, designing layout of formwork members) affects the economy of in situ concrete structures. Formwork rental cost, and labor cost of formwork installation and removal, have a significant share in total cost. The paper investigates into the problem of minimizing wall shuttering cost. A mathematical model of the pro...
Article
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Construction and modernization of roads is a big challenge in terms of technology, organization, and logistics. Diversity and volatility of construction conditions implicates the key importance of logistics strategy, and the decision on selecting a particular model of logistic services is crucial for the project success. Road works consume enormous...
Article
Current network techniques used for project scheduling presume that there is only one logical sequence of activities. However, in reality, the precedence logic of activities is not necessarily unchangeable. There are two types of relations between activities: fixed (hard) and soft. Current scheduling methods do not differentiate between these two t...
Article
The actual completion time of construction projects is rarely in accordance with initial plans. This is due to unforeseen events that affect the project execution. In the paper, the authors propose a method of improving the construction schedule reliability. The method is based on the idea of buffers allocation, whose proper sizing helps to reduce...
Article
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“Evaluating Surrogate Measures of Construction Project Schedule Robustness”
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“Project Performance Reporting and Prediction: Extensions of Earned Value Management”
Article
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A tender procedure should facilitate selection of a reliable contractor with consideration to many criteria. Polish public procurement law, harmonized with EU guidelines on the subject, describes selection procedures in detail. Similar procedures are adopted by private sector clients as there exist no private sector specific procurement codes of pr...
Article
The assumption of static and deterministic conditions is common in the practice of construction project planning. However, at the construction phase, projects are subject to uncertainty. This may lead to serious schedule disruptions and, as a consequence, serious revisions of the schedule baseline. The paper focuses on the problem of constructing r...
Article
Many methods have been developed for scheduling projects with resource continuity constraints. If a construction project can be divided into similar repetitive units, a time space or linear scheduling method can be applied. Reduction of the resources idle time also affects the duration of a project scheduled as a complex of operations and modeled a...
Article
Full-text available
Resources selection and allocation at the project planning stage is an important issue for reducing project cost, duration and risk. Existing planning and scheduling methods overlook aspects of limited production capacity of construction companies (contractors) due to the fact that they are simultaneously engaged in realization of some projects. Th...
Article
The paper discusses the problem of designing a construction project’s organisation structure at the operating level, where tasks and processes are of “complex of operations” type. Such a system includes heterogeneous operating units (crews, teams) of a general contractor and cooperating external ones – subcontractors, that create a temporary organi...
Article
The project owners demand that construction projects are to be accomplished on time and to budget. Regardless of the construction project procurement system, duration and cost are the key factors determining project’s economic efficiency and fulfillment of the owner’s needs and requirements. Beside quality, they are basic criteria taken into accoun...
Article
Sieci Petriego złożone z miejsc (places) i tranzycji (transition) to sieci P/T. W artykule zaprezentowano sieci P/T, jako dobre narzędzie wspomagania decyzji w zakresie projektowania realizacji przedsięwzięć z powtarzalnymi procesami. Wykazano dlaczego sieci Petriego mogą stanowić narzędzie wspomagania podejmowania decyzji w procesie kontraktowania...
Article
This paper attempts to use evolutionary algorithms to solve the problem of minimizing construction project duration in deterministic conditions, with in-time changeable and limited accessibility of renewable resources workforce, machines, and equipment. Particular construction processes with various levels of complexity must be conducted in the est...
Article
The development of communication technology created the basis of a new form of organisations - virtual organisations that may also operate as economic entities. They are a set of organisations independent and separate in terms of their location, legal and organisational form and finance system, but executing a common enterprise. The members of a vi...
Article
Full-text available
This paper aims at solving the problem of minimising the construction project duration in deterministic conditions when the accessibility of renewable resources is limited and changeable in time (workforce, machines and equipment). Particular construction processes (with various levels of complexity) must be conducted in the established technologic...
Article
Przedstawiono krótkie omówienie metody, zwanej CC/BM (critical chain scheduling and buffer management) lub CCPM (critical chain construction project). Podkreślono, że nie jest ona powszechnie znana i stosowana w praktyce w Polsce. Przedstawiono przykład wykorzystania tej metody do harmonogramowania przedsięwzięcia budowlanego. Przytoczono krytyczną...
Article
Full-text available
This paper aims at solving the problem of minimising the construction project duration in deterministic conditions when the accessibility of renewable resources is limited and changeable in time (workforce, machines and equipment). Particular construction processes (with various levels of complexity) must be conducted in the established technologic...
Article
Full-text available
The environment in which the project schedule will be executed is far from being static. Projects are subject to various uncertainties that have negative effect on activity durations. This is most apparent in the case of construction projects. The frequency and impact of risks depend on project-specific, contractor-specific and location-specific co...
Article
Streszczenie: W artykule podjęto problem projektowania struktury systemu wykonawczego przy harmonogramowaniu realizacji przedsięwzięcia budowlanego typu "kompleks operacji". System ten złożony jest z niejednorodnych jednostek operacyjnych generalnego wykonawcy oraz kooperujących jednostek zewnętrznych – podwykonawców. Tworzą oni tymczasową organiza...
Article
Construction projects are especially prone to risk. Duration of construction processes is affected by numerous factors. Their frequency of occurrence and magnitude of effect theyhave on project outcomes depend on project-specific conditions related, among others, to the site, project participants, and geographic location. The paper analyses the res...

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