煤矸石在道路沥青路面底基层的利用  

Utilization of coal gangue in subbase course of asphalt pavement

作　　者：王朝 田荣燕[1] 王松锋 杜咏峥 李毅杰 Wang Chao;Tian Rongyan;Wang Songfeng;Du Yongzheng;Li Yijie(School of Engineering,Tibet University,Lhasa Xizang 850000,China)

机构地区：[1]西藏大学工学院,西藏拉萨850000

出　　处：《山西建筑》2023年第24期114-117,132,共5页Shanxi Architecture

基　　金：大学生创新创业训练项目:废弃矿采资源在沥青道路底基层的利用——以煤矸石为主(项目编号:S202210694012)。

摘　　要：西南地区在开采矿产时形成大量尾矿、煤矸石、废石、煤灰渣等固体废弃物,不仅极易引发矿山地质灾害,而且对矿产资源造成极大浪费。响应国家加快生态文明建设,促进自治区矿产资源节约与高效利用政策,以G109国道唐古拉山段为研究地点,将煤矸石等废弃矿渣替换原有底基层材料,设计不同配合比,通过无侧限抗压强度试验、冻融抗压强度比试验以及抗冲刷试验,探究煤矸石应用于西藏地区道路底基层的可行性。结果表明:将适量煤矸石替换天然碎石,可以提高底基层材料抗压强度,减小试件累积冲刷量;随着煤矸石含量的增加,试件冻融强度比整体上呈上升趋势。结合各实验结果分析,最佳配合比为m(水泥)∶m(石灰)∶m(粉煤灰)∶m(煤矸石)∶m(碎石)=2∶10∶38∶35∶15。In southwest China,a large amount of solid waste such as tailings,coal gangue,waste rock,coal ash and so on is formed when mining minerals,which not only easily causes geological disasters in mines,but also causes great waste of mineral resources.In response to the national policy of accelerating the construction of ecological civilization and promoting the conservation and efficient utilization of mineral resources in the autonomous region,this paper takes Tanggula Mountain section of G109 National Highway as the research site,replaces the original base material with coal gangue and other waste slag,designs different mix ratios,and passes unrestricted compressive strength test,freeze-thaw compressive strength ratio test and erosion resistance test.To explore the feasibility of applying coal gangue to road base in Xizang area.The results show that the compressive strength of the base material can be increased and the cumulative brush amount of the specimen can be reduced by replacing the natural stone with the appropriate amount of coal gangue.With the increase of coal gangue content,the ratio of freeze-thaw strength of the specimens increases on the whole.According to the analysis of the experimental results,the optimal mix ratio is m(cement)∶m(lime)∶m(fly ash)∶m(coal gangue)∶m(crushed stone)=2∶10∶38∶35∶15.

关 键 词：煤矸石 底基层 配合比 抗压强度 

分 类 号：TU521.23[建筑科学—建筑技术科学]