Attitudinal and behavioural approaches to improving waste management on construction projects in Australia: benefits and limitations

Evaluating the COVID-19 impacts on the construction and demolition waste management and resource recovery industry: experience from the Australian built environment sector

The COVID-19 crisis has brought unprecedented challenges to many sectors, including the built environment. The construction and demolition (C&D) waste management and recovery industry is an essential service provider to this sector. Like other industries, this industry has been affected by the pandemic in many ways. However, in Australia, this impact has not been thoroughly investigated. This study, therefore, explores COVID-19 impacts on the Australian C&D waste recovery and construction industry as the major waste consumer and generator. To achieve this aim, a literature review and a series of semi-structured interviews were conducted with 27 participants representing five stakeholder groups (government, construction, waste recovery, material supplying and consultancy) across five Australian states. The research findings established that there is a critical need for leveraging digital technologies, developing business contingency plans, creating coalitions between government and industry, and diversifying supply chains to reduce supply chain risks. This study also uncovered a range of targeted responses and recommendations to manage pandemic-induced disruptions and improve the circular economy in the industry. Our findings can immediately assist industrial practitioners and government decision-makers in managing the impacts of COVID-19 on the waste recovery activities in C&D waste and other waste streams.

Critical Success Factors for Concrete Recycling in Construction Projects

This study explores the success factors of concrete recycling in construction projects, using Malaysia as a case study. The objectives include (1) identifying the critical success factors for concrete recycling in construction projects, (2) comparing the critical success factors between large enterprises (LEs) and small–medium enterprises (SMEs), and (3) developing constructs that group the critical success factors. First, a list of success factors was identified through semi-structured interviews with fifteen construction industry professionals and a systematic literature review of journal articles. This list was then incorporated into a questionnaire and disseminated to industry professionals. Eighty-nine valid responses were collected and analyzed using mean score ranking, normalization, agreement analysis, and factor analysis techniques. The analyses showed ten critical success factors for concrete recycling. The critical success factors include the availability of uniform standards for concrete recycling, adequate awareness among project stakeholders on concrete recycling, appropriate construction waste management plans, government policies to support concrete recycling, good marketing strategy for concrete recycling, good communication among employees, applications for recycled concrete in sub-industries, provisions in work method statements on concrete recycling, positive legislation toward concrete recycling, and availability of concrete recycling infrastructure. However, the percentage of agreement between SMEs and LEs for the ten critical success factors was only 22%. In other words, there is no consensus on criticality across organizational sizes. Finally, the critical success factors can be categorized into two interrelated groups: external and internal. This study contributes to the literature by analyzing the necessary success factors for concrete recycling. The study findings allow researchers and practitioners to develop strategies to promote concrete recycling.

Construction and demolition waste management in Australia: A mini-review

Construction and demolition activities generate huge quantities of waste with substantial impacts on environment. This mini-review article covers the literatures relating to construction and demolition waste management practice in Australia. The Scopus search engine was used in literature search and 26 journal articles relating to construction and demolition waste management in Australia were targeted for analysis. Additionally, various government acts, regulations, policies, and strategy documents were collected and analyzed. This review indicated that the inconsistencies in legislation and landfill levies across states and territories contributed to the cross-jurisdiction waste movement. Given the stakeholders' attitude and project life cycle, this review reported that the design phase had the greatest potential to minimize waste and that the role of designers had been highlighted in various empirical studies. This review provides practitioners and academics with an understanding of the current construction and demolition waste management research in Australia and recommends directions for future research.

Building Information Modeling (BIM) for Construction and Demolition Waste Management in Australia: A Research Agenda

Construction and demolition waste (C&DW) contribute to approximately 30% of the total waste generation worldwide, by which heterogeneous ecological impacts, such as resource depletion, global warming, and land degradation, are engendered. Despite ongoing research efforts to minimize construction waste via the Building Information Modeling (BIM)-aided design, there is a paucity of research on integrating BIM in demolition waste management (DWM). This study investigates prominent barriers and future research directions toward the wider adoption of BIM in C&DWM by conducting a systematic literature review. First, this study identifies the barriers that hinder the implementation of C&DWM in Australia; then, it explores the benefits and challenges of leveraging BIM applications for C&DWM. The findings suggest that, for existing buildings without up-to-date design drawings, it is imperative to improve the accuracy of data capturing and object recognition techniques to overcome the bottlenecks of BIM-DWM integration. Moreover, the development of regional-oriented material banks and their harmonization with life cycle assessment databases can extend the potential of BIM-based sustainability analysis, making it applicable to the DWM domain. This study proposes a research agenda on tackling these challenges to realize BIM’s full potential in facilitating DWM.

Main Challenges to Concrete Recycling in Practice

While concrete recycling is crucial to protecting the environment, its implementation in practice is low in many countries. This study aims to highlight challenges to concrete recycling. To achieve that aim, the study objectives are (1) to identify the main challenges to concrete recycling in construction projects; (2) to compare the main challenges between small–medium enterprises (SMEs) and large enterprises (LEs); and (3) to determine the underlying groups among the main challenges. Potential challenges were identified through a systematic literature review of journal articles and semi-structured interviews with fifteen industry practitioners. Then, the identified challenges were inserted into a questionnaire survey and distributed to industry practitioners. Eighty-nine valid responses were collected and analyzed using the mean score ranking, normalization, agreement analysis, and factor analysis techniques. The analyses show thirteen main challenges to concrete recycling. The main challenges include increased project duration, lack of national programs, lack of comprehensive rules and regulations, increased project cost, low demand for recycled concrete, low cost-effectiveness of concrete recycling, and increased transportation cost. However, there is no consensus on the criticality between SMEs and LEs. For example, increased project cost is the main challenge for SMEs but is only middlingly ranked for LEs. Finally, the main challenges can be categorized into three interrelated groups: people and technical, legal and environmental, and economic challenges. This study contributes to the literature by analyzing challenges that hinder concrete recycling in practice. The findings allow researchers and practitioners to develop strategies to reduce concrete recycling rejection.

A Systematic Review of Construction and Demolition Waste Management in Australia: Current Practices and Challenges

Construction and demolition waste (C&DW) has a deleterious impacts on sustainability not only in developing countries but also in developed nations. For example, Australia generated more than 27 million tonnes of C&DW in 2018–2019; however, only 60% of this waste stream was recovered. Considering this low recovery rate, lower than many developed nations, and with regards to the increasing rate of C&DW generation, extra attention should be given to the construction and demolition waste management (C&DWM) in Australia. Therefore, this research attempts to accurately understand the current practices and challenges of C&DWM in Australia. To do so, primarily, a systematic review of studies relevant to C&DWM from 2010 to 2021 was performed. In this step, 26 research documents were meticulously analysed to identify the current practices of C&DWM in Australia. Then, an in-depth interview with three experts were undertaken to verify the major results and to investigate the challenges of C&DWM in Australia. The results indicated that three factors significantly affect C&DWM in Australia, namely attitudes and behaviour of C&DWM stakeholders, C&DWM in project life cycles, and C&DWM regulations with regards to sustainability, adding that the latter was revealed as the most effective in C&DWM in Australia.

Stakeholder-Associated Factors Influencing Construction and Demolition Waste Management: A Systematic Review

Construction and demolition (C&D) activities generate a large amount of waste and have significant impacts on the environment. Thus, it is necessary to implement C&D waste management (WM), which requires the involvement of stakeholders and is influenced by a variety of factors. This study aims to undertake a systematic review of the stakeholder-associated factors influencing C&D WM. The Scopus search engine was used in a literature search, and two rounds of screening were performed. Only journal articles or reviews that were published in English after 2000 were used in this study. A total of 106 journal articles were reviewed. The review identified 35 stakeholder-associated factors influencing C&D WM and categorized them into six groups: regulatory environment, government and public supervision, advances in technologies, recycling market, knowledge, awareness, attitude, and behaviour of stakeholders, and project-specific factors. All the 35 factors are discussed in detail with considerations into relevant stakeholders. Although there have been studies focused on the factors influencing C&D WM, few have attempted to take stakeholders’ perspectives into consideration. This study expands the C&D WM literature by mapping the influential factors with relevant stakeholders and enables the practitioners to clearly understand their roles and responsibilities and make better informed decisions in the C&D WM process.

Using Recycled Construction and Demolition Waste Products: A Review of Stakeholders’ Perceptions, Decisions, and Motivations

While the increasing rate of urbanisation is a critical concern for socio-environmental reasons, this also leads to more extraction of natural raw materials and the generation of significant quantities of construction and demolition (C&D) waste. Although the use of recycled C&D waste products is technically feasible and regulated, and positive application examples are evident, it is still unclear how to engage key stakeholders to leverage this opportunity in construction projects. Previous research has shown that there is some level of resistance to the reuse of recycled C&D waste products in construction projects. This highlights a critical need to identify the roles of key stakeholders and the barriers they face when using recycled C&D materials. This paper therefore investigates the type of stakeholders influencing the use of recycled C&D waste products and the main factors affecting stakeholders’ decisions to use recycled C&D waste products through a systematic literature review. The authors present an emergent enablers and barriers for recycled C&D waste products model and provide commentary on how stakeholders’ perceptions, decision and behaviour influence the use of recycled C&D waste products. The authors also contribute to the body of knowledge with insights into the factors that various stakeholders believe influence the market for recycled C&D waste products and provides a reference point for authorities to consider these behavioural insights for policy reform.

Sustainability rating tools for highway projects: the nature and outcomes of use

Sustainability rating tools for civil infrastructure including highways are increasing in use. The Ceequal scheme has been operating in the UK for around 14 years with over 360 project ratings awarded. The Greenroads, Envision and Infrastructure Sustainability schemes are growing in use in the USA and Australasia – collectively awarding close to 90 projects since 2012. What opportunities do these rating tools present for asset managers to better drive performance in terms of the social, environmental and economic impacts of infrastructure development? What progress have they made so far? This study draws on the analysis of the rating schemes used by industry today and, in particular, examines the realities of tool use by way of published case studies and interviews with rating tool users and asset owners in Australia, New Zealand, the UK and North America. Project data and user perspectives reveal details on the international use of rating tools and highlight aspects of tool bias and associated challenges in tool selection and comparison, access to performance benchmarking and the reporting of sustainability outcomes particularly for public infrastructure assets.

Public sector’s perspective on implementing public – private partnership (PPP) policy in Ghana and Hong Kong

Purpose

The public sector plays a critical role in the successful implementation of public–private partnership (PPP) projects. Thus, there is a need to holistically explore the public sector’s view on the implementation practices of PPP. This paper aims to explore and compare the public sector’s views on PPP practices in Ghana and Hong Kong.

Design/methodology/approach

Semi-structured interviews were conducted with PPP practitioners of senior authority in public institutions in both Ghana and Hong Kong. The interviews covered critical issues of PPP implementation practices such as motivations for engaging in PPP, success criteria/indicators, critical success factors (CSFs), external stakeholder management and training and education in PPPs.

Findings

The findings show that quick delivery of public projects and private sector efficiency are the reasons considered by both groups of interviewees. On the success criteria, interviewees from both jurisdictions mentioned user satisfaction, budget, time and quality. The CSFs mentioned by both groups include capacity building and training, project viability, proper planning and good feasibility studies. Sensitization programs, including open forums and community meetings, were mentioned by both groups as measures for managing external stakeholders. On the training and education, both groups mentioned international study tours and organizing courses and seminars.

Originality/value

The outputs of this study offer strategies that are very useful to international private developers who are interested in PPP practices in Africa and Asia. Further, the findings contribute to the knowledge on the international best practices for PPP.

Factors influencing building refurbishment site managers’ waste management efforts

Purpose

This paper aims to analyse the factors influencing refurbishment site managers’ waste management efforts.

Design/methodology/approach

Twenty-seven semi-structured interviews were held with managers from two large contractors involved in housing and office refurbishment projects in Sweden. Also, a web and postal questionnaire survey was sent to 232 refurbishment site managers and received a 34 per cent response rate.

Findings

Site managers devise waste management strategies based on environmental inventories and project size. In smaller projects, waste contractors are employed only for physical activities rather than providing advice. Site managers’ waste management efforts are influenced by project-related factors, organizational and personal factors, technical factors, industry culture and legislation. The level of contract detail, specific client demands related to waste management and project size are important factors.

Practical implications

Policies and guidelines for projects of different sizes should be developed at least for large contractors; scale influences site managers’ waste strategies. Waste management efforts in refurbishment projects can be improved by addressing simple technical problems including providing clear labelling of containers and ensuring shelter from rain and snow.

Originality/value

This is a pioneer survey of refurbishment site manager opinions and practices. Inefficient waste management in building refurbishment projects can be costly and harmful to the environment. There are many opportunities to improve waste management efforts.