| MATERIALS AND SUSTAINABLE DEVELOPMENT: MATERIALS REMANUFACTURING AND WASTE RECYCLING |
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| Effect of Multi-factor on the Compressive Strength of Construction and Demolition Waste Based Geopolymer Concrete |
| DAI Jinxin1,2, SHI Xiaoshuang1,2,*, WANG Qingyuan1,2,3,*, ZHANG Hong'en1,2, LUAN Chenchen1,2, ZHANG Kuanyu1,2, YANG Fuhua1,2
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1 MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
2 Failure Mechanics and Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
3 Department of Mechanical Engineering, Chengdu University, Chengdu 610106, China |
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Abstract Alarge amount of construction and demolition waste (CDW) has caused a serious burden on the environment. This paper utilized construction and demolition waste composites from CDW to replace fly ash in the geopolymer concrete. The effects of curing conditions, alkali activator concentrations and the replacement rates of construction and demolition waste composites on the compressive strength of construction and demolition waste based geopolymer concrete (CDW-GC) were investigated. Scanning electron microscope (SEM) was used to study the microstructure performance of these samples. Results obtained showed that construction and demolition waste composites had a negative effect on the workability of geopolymer concrete, but the compressive strength of CDW-GC with replacement rates of 20%—60% was improved compared with the reference concrete. Compared with curing at ambient temperature, the 3 d, 7 d and 28 d compressive strength increased by 198.5%, 104.0% and 52.6% while curing at high temperature for 24 h. The effect of alkali activator concentrations on CDW-GC was related to the replacement rates of construction and demolition waste composites. With the low replacement rates (0%—40%), the compressive strength increased with the increase of alkali activator concentrations. While with the high replacement rates (60%—100%), the compressive strength first increased and then decreased. It is feasible to use construction and demolition waste composites to partially replace fly ash in geopolymer concrete.
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Published: 31 May 2021
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About author:: Jinxin Dai has been studying for a master's degree in College of Architecture and Environment, Sichuan University since 2018, focusing on the research of solid waste resource utilization. She is currently applying for a patent for invention.
>Xiaoshuang Shi received her Ph.D. degree from College of Architecture and Environment, Sichuan University in 2011. She is currently an associate professor and master tutor. She is mainly engaged in the multi-scale research of new concrete materials and has published more than 40 articles at home and abroad.
Qingyuan Wang received his Ph.D. degree from école Centrale Paris which has been merged into Université Paris-Saclay in 1998. He is currently a professor and master tutor. He is mainly engaged in the research of new materials and structural mechanics, ultra-long life fatigue and reliability, and the resource utilization of construction and demolition waste. He has published more than 200 articles included in Web of Science, and has been cited more than 3 000 times. He has been selected as Chinese Most Cited Researchers from 2014 to 2019. |
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2021, Vol. 35 
