An innovative and efficient multi-generation recycling system for waste concrete subjected to freeze-thaw environment: A theory model and case study

Wang, Zhen; Zhu, Pinghua; Hui, Liu; Wang, Xinjie; Chen, Chunhong

doi:10.1016/j.jclepro.2022.132135

Cited by 8 publications

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“…The adoption of sustainable consumption and production patterns is one of the key goals of the United Nations 2030 Agenda for Sustainable Development. At present, in order to achieve socially sustainable production and promote the development of a green economy, the recycling and utilization of materials have been paid attention to in many fields, such as medical treatment, food processing, bioenergy, electronic equipment, and construction [ 1 , 2 , 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the environmental burden and economic benefit brought by RAC production were the important factors that restrict its application potential. As a consequence, it should not be limited to a single study of RAC performance, but should be combined with a comprehensive evaluation of performance, environmental load, and economic benefits [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive Evaluation of the Sustainability of Waste Concrete towards Structural Concrete Application in Freeze-Thaw Environment

et al. 2022

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To promote the in-situ and structural application of waste concrete in cold regions, the sustainable application potential of waste concrete in a freeze-thaw (F-T) environment was comprehensively evaluated from three aspects of performance, environmental load, and economic benefit. The recycled aggregate concrete (RAC) was produced by recycled coarse aggregate (RCA), which was obtained from the crushing of natural aggregate concrete (NAC) after every F-T 150 cycles until F-T failure. The effects of F-T damage of parent concrete on the physical properties of RCA and mechanical and frost resistance of RAC under 35% flexural stress were studied. Besides, the sustainability of NAC and RAC was compared and analyzed by emergy theory. The results suggested that the physical properties of RCA deteriorated gradually with the accumulation of F-T damage to parent concrete. The RCA obtained from parent concrete that suffered F-T damage could be used as coarse aggregate for structural concrete when F-T damage is smaller than 0.367. The F-T damage of parent concrete had an adverse effect on the mechanical properties and frost resistance of RAC. The frost resistance of RAC obtained from parent concrete with larger F-T damage was worse. The RAC prepared from parent concrete without F-T failure can serve 50 years in cold regions, while that with F-T failure can only serve 30 years. The F-T damage microelements were dispersed in the adhesive mortar of RCA and transferred to RAC, resulting in the reduction of the mechanical properties and frost resistance of RAC. Emergy analysis showed that the reuse of waste concrete after F-T failure required higher economic input, higher environment load, lower output efficiency, and sustainability. The performance, environmental load and economic benefit of RAC prepared by using waste concrete after F-T failure were inferior to that of waste concrete without F-T failure. Waste concrete after F-T failure is not recommended to be used as coarse aggregate for structural concrete.

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