Mechanical and Environmental Evaluation of Concrete Mix Using Aggregates Recycled from Construction and Demolition Waste
Yu Zhang 1,2
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School of Rail Transportation, Soochow University, Suzhou 215131, China
Graduate School of Global Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
Management of Business, Fisher College, Boston 02116, USA
Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing Botanical Garden, Mem. Sun Yat-Sen, Nanjing 210014, China
Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing 210014, China
Jiangsu Suzhou Geological Engineering Survey Institute, Suzhou 215011, China
Submission date: 2021-12-29
Final revision date: 2022-03-03
Acceptance date: 2022-03-07
Online publication date: 2022-05-30
Publication date: 2022-07-12
Corresponding author
Qiang Tang   

Soochow University, 215000, Suzhou, China
Pol. J. Environ. Stud. 2022;31(4):3929-3940
Construction and demolition waste (CDW) has begun to take its toll on the environment. One option to mitigate the negative influence is to utilize CDW as recycled aggregate (RA) in concrete production. Recycled aggregate concrete (RAC) mixtures prepared by replacing natural aggregate (NA) with RA, with expansive agent (EXP) and polypropylene fiber (PPF) as additives, have been cast to study their mechanical properties and environmental impact. The results of compressive strength testing reveal that both additives, EXP and PPF, have positive effects on the mechanical properties. The microscopic analysis shows that the hydration reaction of EXP generates ettringite crystals which fill the internal pores of the concrete and increase the compactness of the concrete. Fiber can significantly improve the bonding between cement paste and aggregates, thus enhancing the deformation resistance of concrete. Environmental analysis shows that the leaching amount of heavy metals is very limited which is within 11.67% of the required value in China standard, and carbon emission of concrete with RA as aggregates and fly ash as low-carbon binder is lower than that of concrete without RA. The use of CDW recycled aggregates may significantly mitigate the environmental impact and improve the sustainability during concrete production.
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