煤矸石集料的加速风化制度研究  

Study on Accelerated Weathering System of Coal Gangue Aggregate

作　　者：龚天天 陈潇[1,2] 张彦君 陈志军 王文军 周明凯[1,2] GONG Tiantian;CHEN Xiao;ZHANG Yanjun;CHEN Zhijun;WANG Wenjun;ZHOU Mingkai(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Shanxi Road and Bridge Shuozhou National Road Yingshuo Project Construction Management Co.,Ltd.,Shuozhou 037610,China)

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [3]山西路桥集团朔州国道应朔项目建设管理有限公司,朔州037610

出　　处：《硅酸盐通报》2024年第9期3252-3261,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52272025)。

摘　　要：本文以三种不同排放地的原状煤矸石为研究对象,分别采用干湿循环、冻融循环以及耐崩解性试验对煤矸石集料进行加速风化,旨在研究煤矸石的风化特性。以加速风化后的煤矸石集料质量损失率和压碎值指标对煤矸石风化特性进行表征,研究加速风化制度、颗粒粒径、服役状态对煤矸石集料风化特性的影响,同时采用XRD、SEM以及EDS微观测试手段揭示煤矸石的风化机理。结果表明:采用干湿循环方式得到的煤矸石集料质量损失率和压碎值指标与自然状态下煤矸石集料风化180 d的最为接近,同时煤矸石集料粒径越大越容易发生风化,且服役状态下,煤矸石集料的风化作用不明显。微观测试结果表明,煤矸石风化机理为在风化过程中煤矸石内部的矿物组成及结构受到破坏,导致煤矸石发生崩解、脱落,而服役状态下的煤矸石由于被胶凝材料包裹,风化概率有效减小。Three kinds of original coal gangue from different emission places were taken as the research object,and the dry-wet cycle,freeze-thaw cycle and disintegration resistance test were used to accelerate the weathering of coal gangue aggregate,aiming to study the weathering characteristics of coal gangue.The weathering characteristics of coal gangue aggregate were characterized by the mass loss rate and crushing value index after accelerated weathering.The effects of accelerated weathering system,particle size and service state on the weathering characteristics of coal gangue aggregate were studied.At the same time,the weathering mechanism of coal gangue was revealed by XRD,SEM and EDS.The results show that the mass loss rate and crushing value index of coal gangue aggregate obtained by accelerated weathering of dry-wet cycle are closest to coal gangue aggregate weathered for 180 d under natural state.Moreover,the larger the particle size of coal gangue aggregate,the more likely it is to be weathered,and the weathering of coal gangue aggregate is not obvious under service state.The microscopic test results show that the weathering mechanism of coal gangue is that the mineral composition and structure inside the coal gangue are destroyed during the weathering process,resulting in disintegration and shedding,while the coal gangue in the service state can effectively reduce its weathering due to the encapsulation of cementitious materials.

关 键 词：煤矸石 风化特性 服役状态 干湿循环 自然风化 

分 类 号：U414[交通运输工程—道路与铁道工程]