1. A review of energy-efficient and sustainable construction scheduling supported with optimization toolsBorna Dasović, Uroš Klanšek, 2022, review article Abstract: This article reviews the accomplishments of studies in which optimization tools were used to develop energy-efficient and sustainable construction schedules. With the increase in global awareness of environmental issues, the construction industry has been forced to explore innovative techniques to make the building process more energy-efficient and sustainable. Project managers can use optimization tools in their scheduling procedures to address these issues in the early stages of the project. Therefore, this paper examines different optimization-based construction scheduling methods and their impact on schedule energy efficiency and the three key sustainability goals: economic viability, social equity, and environmental protection. Such a review has not yet been conducted to the best of our knowledge. This research aims to fill the gap and contribute to understanding advanced optimization tools that can pave the way to energy-efficient and sustainable scheduling practices. After a brief introduction, the background of optimization-based construction scheduling techniques that aim to improve construction management and incorporate these aspects into the decision-making process is explained. Then, these approaches are addressed in detail. It is determined for each study whether it adopted energy efficiency goals and which sustainability dimensions it considered within the proposed optimization model. The results of this study indicate a wide heuristic algorithms application for complex scheduling problems. Meanwhile, mathematical programming is still quite unexplored, especially methods that utilize algebraic modeling languages. This study provides a foundation for further research by addressing the current reach in development and possible knowledge gaps that could be researched in future studies. The paper also discusses the advantages and limitations of different approaches and illustrates the potential for utilizing these methods. Supported by the main review findings, conclusions and recommendations for further research are provided.
Keywords: construction, project management, optimization tools, scheduling, sustainability, energy efficiency
Published in DKUM: 26.09.2023; Views: 393; Downloads: 631
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2. Potential of using waste materials in flexible pavement structures identified by optimization design approachPrimož Jelušič, Süleyman Gücek, Bojan Žlender, Cahit Gürer, Rok Varga, Tamara Bračko, Murat V. Taciroğlu, Burak E. Korkmaz, Şule Yarcı, Borut Macuh, 2023, original scientific article Abstract: This paper presents the design of geosynthetic reinforced flexible pavements and their modification by incorporating waste materials into bonded and unbonded layers of the pavement structure. The optimal design of flexible pavements was achieved by minimizing the construction cost of the pavement. The incorporation of waste materials into the pavement structure affects the material properties. Therefore, along with the traffic load, the effects of the material properties of the asphalt concrete, base layer, sub-base layer, and subgrade were analyzed in terms of pavement structure costs and CO2 emissions of materials used in pavement construction. In addition, a comparison was made between pavements with and without geosynthetic reinforcement in terms of design, optimum construction cost, and CO2 emissions. The use of geosynthetics is even more effective in pavement structures that contain waste materials in an unbound layer, both in terms of cost and CO2 emissions. The minimum value of the California Bearing Ratio of the subgrade was determined at which the use of geosynthetic reinforcement for pavement structure with and without the inclusion of waste materials is economically and sustainably justified. The use of geosynthetics could result in a 15% reduction in pavement structure cost and a 9% reduction in CO2 emissions due to the reduced thickness of unbound layers. In addition, reducing the CBR of the unbound layer from 100% to 30% due to the inclusion of waste materials implies a cost increase of up to 13%. While the present study is based on an empirical pavement design method in which pavement thickness is limited by the pavement thickness index, the same minimum thicknesses are obtained in the optimization process regardless of whether the objective function is the minimum construction cost or minimum CO2 emissions.
Keywords: pavement design, waste materials, optimization, minimum construction cost, CO2 emissions, geosynthetics, waste management
Published in DKUM: 18.09.2023; Views: 644; Downloads: 56
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3. Survey of accomplishments in BIM implementation in Croatia, the Czech Republic, Germany, and SloveniaMario Galić, Vaclav Venkrbec, Franziska Chmelik, Immo Feine, Zoran Pučko, Uroš Klanšek, 2017, original scientific article Abstract: Building information modelling (BIM) may currently be considered the fastest developing concept in the field of construction management, aiming to become a global standard. Although the roots of the concept date back to the mid-1970s, some original expectations are still missing from its implementation. There has been a time gap between its theoretical and practical implementations. While the simultaneous development of information technologies is one reason for the implementation delay, other reasons remain unclear. This paper analyzes the gaps between theoretical and practical BIM application, as well as the legislation regarding BIM implementation in four countries (in alphabetical order: Croatia, the Czech Republic, Germany, and Slovenia). The paper additionally presents a survey of current practical BIM applications as well as general and theoretical feedback from construction projects that implemented BIM.
Keywords: construction industry, implementation, project management, survey
Published in DKUM: 12.01.2018; Views: 1526; Downloads: 366
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4. Mixed-integer nonlinear programming based optimal time scheduling of construction projects under nonconvex costsRok Cajzek, Uroš Klanšek, 2016, original scientific article Abstract: Optimal project scheduling under nonconvex time-cost relations represents a challenging problem in construction management. The nonconvex time-cost relations may appear in a construction project when several different duration options are available for its activities due to alternative technological processes enabled for their realization or wide accessibility of production resources. The source of nonconvexity of the project scheduling optimization problem can also be the project penalty- or bonus-duration relations arranged within the construction contract. The aim of this paper is to present the mixed-integer nonlinear programming (MINLP) based optimal time scheduling of construction projects under nonconvex costs. For this purpose, the MINLP model was developed and applied. A numerical example from literature and an example of construction project time-cost trade-off analysis under practical nonconvex penalty function are given in the paper to demonstrate advantages of MINLP optimization. The example from literature first presented the capability of the MINLP approach to obtain the optimal solution for difficult, highly combinatorial nonconvex discrete project scheduling problem. Thereupon, the following example revealed that the optimal project time-cost curve may take very nonuniform shape on account of discrete nature of activity direct cost options and nonconvex relation between project duration and total cost. In this way, the presented study intends to provide practitioners with new information from the field of optimization techniques for project scheduling as well as an alternative view on performance of total cost when project duration is changed.
Keywords: extreme environments, construction management, discrete optimization, mixed-integer nonlinear programming, nonconvex costs, time scheduling
Published in DKUM: 12.07.2017; Views: 1577; Downloads: 420
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5. Towards a virtual product modelAndrej Tibaut, Danijel Rebolj, 2003, original scientific article Abstract: Today, many researchers working on the information management process in construction recognise the problem of modelling complex product-related data structures. Furthermore, many experts doubt whether an all-inclusive-product-model is a solution for an integrated information environment that should efficiently support the life cycle of a product. It seems that rich experiences in product modelling gathered during the last decade do not necessarily lead to better models but rather to the awareness the more complex the product models are, the more rgid and less usable they become in practice. The paper first summarises some deficiencies of complex product models and then introduces a new conceptual solution, called "virtual product model", which is based on the on the decomposition of a conventional product model. The concept investigates the dissharmony in the structure and semantics of distributed (virtual) parts by applying agent technology and then the tuple space communication model.
Keywords: gradbeništvo, gradnja objektov, informacijska tehnologija, informacijski sistemi, baze podatkov, integracija, management informacij, upravljanje znanja, izmenjava podatkov, produktni modeli, virtualni produktni modeli, civil engineering, building construction, information technology, information systems, databases, integration, information management, knowlege management, data exchange, product models, virtual product models
Published in DKUM: 10.07.2015; Views: 2647; Downloads: 97
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6. Effective control of unanticipated on-site events : a pragmatic, human-oriented problem solving approachAleš Magdič, Danijel Rebolj, Nataša Šuman, 2004, original scientific article Abstract: Unanticipated events on building sites are inevitable. The frequency of unanticipated events is usually high due to the inherent complexity and dynamics of construction projects. A proper mobile interactive personal network can make use of the rich knowledge and experience of site staff, to handle and effectively resolve on-site problems caused by unanticipated events. Immediate on-site problem solving significantly impacts subsequent project characteristics and leads to a more productive organizational processes as a whole. This paper focuses on the importance of interactive personal communication as a basis for immediate on-site problem solving. For communications support, a human-oriented pragmatic solution in the form of a mobile, interactive, context-sensitive personal network is presented.
Keywords: civil engineering, information technology, mobile computing, project management, construction site, rapid communication
Published in DKUM: 01.06.2012; Views: 2326; Downloads: 48
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