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
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
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.
作者简介: 代金芯,2018年9月起至今于四川大学建筑与环境学院攻读硕士学位,主要从事固废物资源化利用研究。已申请发明专利1项。 石宵爽,副教授,硕士研究生导师,2011年12月毕业于四川大学建筑与环境学院,获得博士研究生学位。主要从事新型混凝土材料的多尺度研究。在国内外重要期刊发表文章40多篇。 王清远,教授,博士研究生导师,1998年7月毕业于法国巴黎中央大学(又译名巴黎中央理工学院,法文:Ecole Centrale Paris,现并入 Universite Paris-Saclay巴黎萨克雷大学),获得博士学位。主要从事新型材料与结构力学问题、超长寿命疲劳与可靠性及建筑垃圾资源化利用等方面的研究。发表Web of Science 收录论文200余篇,被他人引用3 000余篇次,2014—2019连续六年入选Elsevier中国高被引学者。
引用本文:
代金芯, 石宵爽, 王清远, 张红恩, 栾晨晨, 张宽裕, 杨富花. 多因素对再生复合掺料基地聚物混凝土抗压强度的影响[J]. 材料导报, 2021, 35(9): 9077-9082.
DAI Jinxin, SHI Xiaoshuang, WANG Qingyuan, ZHANG Hong'en, LUAN Chenchen, ZHANG Kuanyu, YANG Fuhua. Effect of Multi-factor on the Compressive Strength of Construction and Demolition Waste Based Geopolymer Concrete. Materials Reports, 2021, 35(9): 9077-9082.
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2021, Vol. 35 
