摘要
煤矸石作为煤炭开采和洗煤过程中产生的废弃物,大量堆放会给生态环境带来巨大的压力,以煤矸石为骨料生产混凝土符合绿色可持续发展理念。煤矸石骨料具有孔隙率大、针片状颗粒含量高的特性,会对混凝土性能产生较大负面影响。本文简述了煤矸石骨料的基本物化特性,综述了煤矸石骨料对混凝土工作性能、力学性能、耐久性以及界面过渡区的影响;在此基础上,针对煤矸石骨料存在的缺陷,重点综述了煤矸石骨料改性技术(表面包覆、水玻璃改性、热活化和微生物矿化等技术)的研究现状,指出了每种改性技术目前存在的问题及解决方法,并对其在混凝土中的研究方向进行了展望,以期推动煤矸石骨料在混凝土的应用与发展。
As the waste produced by coal mining and coal washing process,massive piling of coal gangue has a serious negative impact on the ecological environment,and using coal gangue as the aggregate of concrete is in line with the concept of green sustainable development.The loose and porous characteristics of coal gangue aggregate and the feature of showing needle-like or flaky after damage will negatively impact various coal gangue concrete properties.The basic physical and chemical properties of coal gangue aggregate were described briefly,while the effect of coal gangue aggregate on workability,mechanical properties,durability,and interfacial transition zone of concrete was also summarized.To compensate for the various defects of gangue aggregates used in concrete,reinforcement techniques relating to gangue aggregates have been proposed to improve the efficiency of gangue resource utilization.Four modification techniques-surface coating,such as water glass modification,thermal activation,and microbial-induced calcium carbonate precipitation techniques can strengthen coal gangue’s defects as an aggregate.On this basis,a summary of the strengthening mechanism and research progress of the above modification technology,and the future of the gangue aggregate and its modification technology in the concrete research direction were put forward to promote the application and development of coal gangue concrete.
作者
冯春花
陈钰
黄益宏
郭晖
朱建平
FENG Chunhua;CHEN Yu;HUANG Yihong;GUO Hui;ZHU Jianping(School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《硅酸盐通报》
CAS
北大核心
2023年第1期133-143,共11页
Bulletin of the Chinese Ceramic Society
基金
河南省重大公益专项(201300311000)
河南省科技攻关项目(212102310564,212102310566)
绿色高性能建筑材料河南省杰出外籍科学家工作室(GZS2021003)。
关键词
煤矸石骨料
混凝土
力学性能
耐久性
改性
界面过渡区
coal gangue aggregate
concrete
mechanical property
durability
modification
interfacial transition zone
