Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

被引：50

作者：

Hao, Ying ^{[1
]}

Guo, Xiaoning ^{[1
]}

Yao, Xianhua ^{[1
,2
]}

Han, Ruicong ^{[1
]}

Li, Lielie ^{[1
]}

Zhang, Min ^{[1
]}

机构：

[1] North China Univ Water Resources & Elect Power, Sch Civil Engn & Commun, Zhengzhou 450045, Peoples R China

[2] Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg, Xian 710048, Peoples R China

来源：

MATERIALS | 2022年 / 15卷 / 13期

基金：

中国国家自然科学基金;

关键词：

coal gangue; concrete; aggregate; solid waste utilization; modified materials; concrete performance; POZZOLANIC ACTIVITY; MECHANICAL-PROPERTIES; RECYCLED CONCRETE; COARSE AGGREGATE; CEMENT; ACTIVATION; STRENGTH; PERMEABILITY; EXTRACTION; BEHAVIOR;

D O I：

10.3390/ma15134495

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Coal gangue is a kind of industrial solid waste with serious ecological and environmental implications. Producing concrete with coal gangue aggregate is one of the green sustainable development requirements. This paper reviews the properties and preparation methods of Chinese gangue aggregate, studies the influence of gangue aggregate on concrete properties and the prediction model of gangue concrete, and summarizes the influence of modified materials on gangue concrete. The studies analyzed in this review show that different treatments influence the performance of coal gangue aggregate concrete. With the increase in the replacement ratio of coal gangue aggregate in concrete, the concrete workability and mechanical performance are reduced. Furthermore, the pore structure changes lead to decreased porosity, greatly affecting the durability. Coal gangue is not recommended for producing high-grade concretes. Nevertheless, pore structure can be improved by adding mineral admixtures, fibers, and admixtures to the coal gangue concrete. Hence, the working properties, mechanical properties, and durability of the concrete can be improved effectively, ensuring that coal gangue concrete meets engineering design requirements. Adding modified materials to coal gangue concrete is a viable future development direction.

引用

页数：27

共 120 条

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