A review of the circularity gap in the construction industry through scientometric analysis

The circular economy (CE) concept has gained popularity among scholars and practitioners as the best way to circumvent the effects of the linear economy and create an effective platform to attain sustainable development within industries including the construction industry. However, understanding parameters of the knowledge body and key issues which needs to be harnessed to enhance the application of concept to the construction industry has been a challenge. In this study, a scientometric analysis was employed to analyze 486 bibliometrics-searched filtered articles of CE in the construction industry to provide a critical understanding of current research trends and applications. Content analysis of selected articles were provided to elucidate key findings, challenges, and proposed strategies, and a SWOT analysis was conducted to appraise the incidental results of applying various circularity strategies to the construction industry. The study has found that key influential areas such as circular product design, end-of-life consideration including the quality, economics, and modular integrated construction were narrowly covered in existing studies. Moreover, there is still a lack of practical CE approach which can integrate the holistic performance assessment tool with the circular business model for the construction industry. Based on the circularity gaps identified through the content analysis, a research framework which consists of eight different research themes including the circular design; manufacture and supply; strategies for CE adoption; consideration of end-of-life principle; CE outcomes/consequences; information exchanges; construction process; and waste management strategies is developed. In addition, a compressive methodological framework is proposed for the effective CE implementation and evaluation. The circularity gaps, key influential areas, research themes, and CE approach highlighted in this study can be used as a guide for future scholarly work and practical adoption of CE in the construction industry.