摘要
为掌握干湿循环作用下煤矸石骨料的性能劣化规律,采用室内模拟试验方法,选取了太原、长治、榆林、许昌四个地区的煤矸石为研究对象,通过宏观和微观测试手段,研究了水、硫酸盐溶液浸泡和干湿交替作用下,煤矸石的强度劣化以及煤矸石-水泥石界面过渡区结构的演变。结果表明:水、硫酸盐溶液对煤矸石有显著的侵蚀作用;水浸泡和干湿交替条件下,四种煤矸石的软化系数仅为0. 3~0. 4之间,明显低于石灰石骨料;硫酸盐溶液干湿循环作用下,煤矸石强度下降率可达80%;水、硫酸盐溶液的干湿条件下,煤矸石-水泥石界面过渡区也受到显著的劣化作用效应,具体表现为骨料与水泥石之间的缝隙变宽、粘结不紧密、靠近过渡区的骨料受破坏等。
In order to grasp the performance deterioration law of coal gangue under the harsh erosion environment such as sulfate,this paper did indoor simulation experiment and selected four kinds of coal gangues from Taiyuan,Changzhi,Yulin,Xuchang as research target.Strength deterioration of coal gangue and evolution of coal gangue-cement ITZ structure under drywet cycle in sulfate/water were studied by macro and micro testing.The results show that water and sulfate solution have significant erosion effect on coal gangue.Under the conditions of water immersion and dry-wet,the softening coefficient of the four coal gangues is only between 0.3 and 0.4,which is significantly lower than that of limestone samples.And under dry-wet cycle in sulfate solution,their strength reduction rate can reach 80%.The dry-wet conditions of water and sulfate solution also have significant deteriorating effects on the interfacial transition zone(ITZ)of coal gangue-cement.The research results can support the application of coal gangue in roadbed fillers and concrete.
作者
李霖皓
龙广成
白朝能
沈远
马昆林
张升
LI Lin-hao;LONG Guang-cheng;BAI Chao-neng;SHENG Yuan;MA Kun-lin;ZHANG Shen(School of Civil Engineering,Central South University,Changsha410075,China;Xi’an Railway Survey and Design Institute Co,Ltd.,Xi’an710054,China)
出处
《煤炭工程》
北大核心
2019年第6期153-159,共7页
Coal Engineering
基金
中铁西安勘察设计研究院有限责任公司2017年科技计划项目(738010875)
