Search results

The purpose of this paper is to explain a current implementation of a programmable and computational material, Logic Matter, and to describe potential applications for computational materials and self‐guided assembly.

Following an introduction, the paper describes the types of information currently found in architectural construction, then introduces Logic Matter, a building block embodying physical digital logic. Examples of structural optimization and construction scenarios are given, to demonstrate the benefits of programmable and computational physical materials for assembly.

Logic Matter demonstrates a prototype with embedded digital logic and programmability, offering new applications for automated assembly, online material analysis and physical computing.

The paper describes the existing types of architectural construction information and proposes a novel application of programmable and computational material for automated assembly.

The construction of residential projects constitutes a major portion of the building activities in the State of Kuwait. This paper presents the findings of a research project, which aims to determine the causes of delays and cost‐overruns in the construction of housing projects in Kuwait. The owners of 450 residential projects (just completed or near completion), spread over 27 systematic‐randomly selected metropolitan districts, were personally interviewed. Data on owners' socio‐demographic traits and project characteristics, including those involving time and cost overruns, were obtained. The paper highlights the impacts of construction materials on time‐delays and cost‐increases. Project‐related variables affecting the on‐time delivery of materials to the construction site are examined and quantified. The material selection‐time, type of materials, their availability in the local market and the presence of a supervising engineer, all demonstrated a statistically significant impact on the on‐time delivery of materials to construction sites.

Building information modelling (BIM) and radio frequency identification (RFID) technologies have been extensively explored to improve supply chain visibility and coordination of material flow processes, particularly in the pursuit of Industry 4.0. It remains challenging, however, to effectively use these technologies to enable the precise and reliable coordination of material flow processes. This paper aims to propose a new workflow designed to include the use of detailed look-ahead plans when using BIM and RFID technologies, which can accurately track and match both the dynamic site needs and supply status of materials.

The new workflow is designed according to lean theory and is modeled using business process modeling notation. To digitally support the workflow, an integrated BIM-RFID database system is constructed that links information on material demands with look-ahead plans. The new workflow is then used to manage material flows in the erection of an office building with prefabricated columns. The performance of the new workflow is compared with that of a traditional workflow, using discrete event simulations. The input for the simulations was derived from expert opinion in semi-structured interviews.

The new workflow enables contractors to better observe on-site status and differences between the actual and planned material requirements, as well as to alert suppliers if necessary. The simulation results indicate that the new workflow has the potential to reduce the duration of the material flow processes by 16.1% compared with the traditional workflow.

The new workflow is illustrated using a real-world-like situation with input data based on expert opinion. Although the workflow shows potential, it should be tested on a real-world site.

The new workflow allows project participants to combine detailed near-term look-ahead plans with BIM and RFID technologies to better manage material flow processes. It is particularly useful for the management of engineer-to-order components considering the dynamic site progress.

The research improves on existing research focused on using BIM and RFID technologies to improve material flow processes by showing how the workflow can be adapted to use detailed look-ahead plans. It reinforces data-driven construction material management practices through improved visibility and reliability in planning and control of material flow processes.

In the construction industry, it is well known that there is a relatively large volume of material being wasted due to a variety of reasons. The problem of material waste on construction sites is not an isolated issue and is of environmental concern. Therefore, waste minimization has become an important issue in the construction industry. The aim of this research was mainly to identify the pre‐cast contribution to the construction waste minimization in the Sri Lankan construction industry, through a comparison of material waste arising from pre‐cast, ready‐mixed and site‐mixed concrete.

Data were collected from 27 building construction projects and three concrete elements: slabs, beams, and columns, were considered to quantify construction waste. To compare the wastage due to pre‐cast involvement with other types, three categories of building projects were used, including projects using pre‐cast concrete elements, in situ concrete elements – site mix, and in‐ situ concrete elements – ready mix.

The study found that mean wastages of cement, sand and metal in PC elements amounted to 5.34 per cent, 13.86 per cent and 7.62 per cent respectively showing lower values compared with the material wastages in the other two technologies (in situ concrete elements – site mix, and in situ concrete elements – ready mix). Further, statistical t‐test and ANOVA were carried out to ascertain whether these results were significant. Results revealed that there is a significant waste reduction when pre‐cast concrete is used.

The paper provides useful information on pre‐cast contribution to the construction waste minimization in the Sri Lankan construction industry.

Urbanization and globalization in India have led to the depletion of resources and degradation of the environment to meet the demands. Because of these issues, researchers and practitioners have begun to study various strategies to reduce the level consumption of resources to utilize it for present and future needs. In pursuit of finding solutions to the problems, sustainable building construction is found as the best key to avoid depletion of resources. Sustainable material selection is found as a vital strategy in construction. The paper aims to discuss this issue.

A three-phase methodology is proposed for framing the assessment model for construction industries to select materials for construction. In the first phase, a total of 23 sub-criteria of triple bottom line (TBL) and four brick materials as alternatives were identified. The second phase finds the weights and ranks of criteria and sub-criteria using the best worst methodology (BWM) the third phase involves ranking of materials concerning sub-criteria weights determined in phase II using Fuzzy Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS).

The objective of study is fixed to identify the criteria list for the selection of material in construction industries from the literature review especially for Indian construction industries; to rank the criteria for selection of materials with the help of the BWM approach; and to prioritize the identified materials in the view of sustainability with the help of Fuzzy TOPSIS in construction industries perspective. This study analyzed and choosing right sustainable materials by the three pillars of sustainability which are the environment, economic and social, also called TBL, for Indian construction companies by framing a sustainable material assessment model.

The results of this study facilitate to frame an assessment model for evaluating and selecting sustainable building materials.

Construction is possibly one of the most cost orientated industries in any economy. The primary mode of supplier selection has always tended to be on the basis of lowest material or service cost at point of consumption. Indeed, this remains the case even in the post‐Latham (1994) and Egan (1998) world in which we live. In general, construction cost estimates are based on a straight ‘take off’ of the quantities required. All further ‘other’ costs in the form of overhead, profit, labour and wastage are consolidated into the cost of the materials. Construction is unique within the various industries making up a modern economy in that the bulk of the materials and components that it uses are of relatively low value while being of high volume. Consequently, a significant proportion of the ‘other’ costs associated with materials purchases must be in the form of transportation from the point of extraction and / or production to the point of consumption. This paper provides an overview of the hidden costs associated with the transportation of construction materials within the industry and proposes improved methods of managing the logistics of the construction process e.g. reverse logistics, in order to reduce costs and increase the basic sustainability of the construction process.

The purpose of this article is to provide scenarios for the incorporation of sustainable waste minimisation strategies that were determined during a research project that investigated sustainable engineering and construction processes.

The research included a thorough review of sustainable engineering and construction practices throughout the world and the collection of additional information from high‐level executives from some of the top ranked global engineering and construction firms. The research was limited to collecting data from high‐level engineering and construction executives since they were the most knowledgeable about the use of sustainable strategies within their firm.

The results determined the main types of construction waste and sustainable strategies that could be used to minimise the amount of waste generated by the construction industry.

he research was limited to collecting data from high‐level engineering and construction executives since they were the most knowledgeable about the use of sustainable strategies within their firms. The research could affect members of the engineering and construction industry, since it provides methods for implementing sustainable strategies that help to reduce the amount of waste generated by the construction industry.

The research is unique because it addressed waste minimisation strategies for the building construction industry and for the industrial and heavy/highway construction industries.

The purpose of this paper is to determine the environmental performance of construction trends in houses in central Mexico by assessing the type and quantity of material used in construction elements.

Three reference Mexican houses are used for the analysis: a traditional house, a house with mostly masonry elements, and a house with mostly concrete elements. The reference houses indicate the construction trend followed in central Mexico. Quantitative analysis of the types and weights of various materials used to construct the houses is undertaken. The environmental performance is measured according to their sustainability potential. The indicators used are based on the Three Step Strategy, which sets the steps needed to achieve sustainable construction: use fewer materials, use renewable materials and be efficient with the remaining need.

The analysis shows that there is a trend to use faster and cheaper construction processes, which are often concrete and prefabricated elements, especially for dwellings built in series. Although this has the positive impact of decreasing the stress on housing demand, it might have negative impacts on the environment because more energy‐intensive and artificial materials are used. In addition, the low homogeneity of these materials decreases the potential of construction elements to be reused or recycled.

The findings of this study aim at providing more information to practitioners on the sustainability of material choices during the design process. Thus practitioners will be better informed to design more environmentally sustainable buildings. The results are based on analysis of data from Central Mexico but may have relevance to other parts of the world.

The study provides quantitatively derived evidence to support sustainable design decisions.

Construction logistics is an essential part of construction supply chain management (CSCM). However, limited attention has been paid to this issue in the New Zealand construction industry. The purpose of this paper is to contribute to the knowledge about what hampers efficiency in transporting construction materials and plants to a construction site. The intention is to gain detailed understanding of the practice and obstacles in efficient construction logistics and thus identify interventions to improve logistics efficiency, especially using the numbers of vehicle movements to the construction site as an indicator.

A case study approach was adopted with on-site observations and interviews. Observations were performed during constructions on-site from the start of construction to “hand-over” to the building owner. A selection of construction suppliers and subcontractors involved in the studied project were interviewed.

Data analysis suggested that cost-related factors affecting the construction logistics, both monetary and non-monetary factors were not measured and largely ignored, especially the possible environmental and/or social impact occurred by the truck movement. Factors in the service-related sector were insufficiently managed in the observed site. The main contribution to inefficient construction logistics are related to understanding and implementing CSCM. It is noticed that there is inadequate awareness of CSCM and logistics efficiency largely due to lack of commitment from the management level and skills at the operational level.

Significant intrinsic and extrinsic interventions necessary to enhance construction logistics were acknowledged from the data analysis. These include both qualitative and quantitative data. These intrinsic and extrinsic interventions, such as implementing appropriate logistics tools that suits individual site and introducing traffic management costs, offer plausible explanations regarding how to improve the efficiency in construction logistics through optimising transportation movements to the construction site.

Construction materials mostly affect the environment during the first stages of their life cycle. Their placement during the construction stage is of equal importance as it affects their environmental impact during the stage of use and the final stage of demolition and rejection. The purpose of this paper is to analyse the environmental impact of different construction details, which are typically used for different city surfaces in Greece.

The analysis of the environmental impact of construction details is both quantitative and qualitative. The quantitative analysis is mainly based on embodied energy calculations of different possibilities of placement. The qualitative analysis of the different construction details considers other environmental issues, such as the water cycle in cities and the possibility of reuse and recycling, which are strongly influenced by the way materials are attached to the building shell or general substrate. All the data are gathered from bibliographical sources.

For urban open spaces and flat roofed buildings, the placement of various materials with and without the use of cement‐based mortars reveals significant differences in the environmental impact. The same applies to building façades with the current construction (cement‐based mortars or synthetic resins) compared to the ventilated façade system.

Architects and designers can use the methodology and the findings of this study in order to carefully design the construction details of building façades and flat roofs, and urban open spaces.

The study points out the significance of the construction stage in the evaluation of the environmental impact of materials in Greece, where there is extensive use of cement mortars and concrete in the construction of the paving of urban open spaces.