玄武岩纤维改性煤矸石-矿渣基地聚物胶砂的性能研究  

Study on the properties of basalt fiber-modified coal gangue and slag-based polymeric mortar

作　　者：杨秋宁[1] 娄亮 张天昊 张东生 毛明杰[1] YANG Qiuning;LOU Liang;ZHANG Tianhao;ZHANG Dongsheng;MAO Mingjie(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Research Group RecyCon,Department of Civil Engineering,KU Leuven,Campus Bruges 8200,Belgium)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]Research Group RecyCon,Department of Civil Engineering,KU Leuven,Campus Bruges 8200,Belgium

出　　处：《安全与环境学报》2025年第4期1593-1602,共10页Journal of Safety and Environment

基　　金：宁夏回族自治区重点研发项目(2021BEG02014)。

摘　　要：大量煤矸石露天堆积会对周围环境造成巨大危害,对其进行资源化利用刻不容缓。由于煤矸石存在天然的火山灰活性,将其作为制备地聚合物的前驱体是实现煤矸石资源化利用的有效途径,符合我国绿色可持续发展的理念。研究将机械活化后的煤矸石与矿渣作为地聚物的前驱体,探究玄武岩纤维(Basalt Fiber, BF)体积分数对煤矸石-矿渣基地聚物(Gangues-Slag Geopolymer, GSG)抗压强度、单轴拉伸性能、断裂性能和干燥收缩的影响,并通过X射线衍射、热重分析对其进行机理分析。研究结果显示:随着BF体积分数的增加,GSG抗压强度先增大后减小,当BF体积分数为0.4%时,GSG的抗压强度达到峰值,为17.2 MPa,较无纤维组提升了37.6%。GSG的断裂性能和单轴拉伸性能随BF体积分数的增加先增大后减小,在纤维体积分数为0.4%时均达到最优。研究引入应变硬化指数来综合评价纤维体积分数对GSG的增韧效果,当体积分数为0.4%时,其应变硬化指数(fpsh)达到最大,为3.613,较无纤维组提升了68.2%。掺入BF可使GSG的干燥收缩性能得到改善,当BF体积分数为1%时,其28 d干缩率较无纤维组降低6.48%。综合试件抗压强度、单轴拉伸性能、断裂性能、干燥收缩各项性能指标可知,BF在GSG中的最优体积分数为0.4%。研究可为玄武岩纤维增强煤矸石-矿渣基地聚物的应用提供理论参考和数据支撑。The outdoor accumulation of coal gangue poses significant risks to the surrounding environment,highlighting the urgent need for its resourceful utilization.Due to its natural volcanic ash properties,coal gangue can effectively serve as a precursor for geopolymer production.This approach aligns with China s commitment to green and sustainable development.In this study,mechanically activated coal gangue and slag were utilized as precursors for geopolymer production.The influence of Basalt Fiber(BF)volume fractions on the compressive strength,uniaxial tensile properties,fracture characteristics,and dry shrinkage of the Gangue-Slag Geopolymer(GSG)was investigated.The microscopic mechanism was analyzed using X-ray Diffraction and Thermogravimetric Analysis.The results indicate that as the volume fraction of BF increases,the compressive strength of the GSG initially rises before subsequently declining.When the BF volume fraction is 0.4%,the compressive strength of the GSG attains its peak value of 17.2 MPa,which is 37.6%higher than that of the control group.Both the fracture properties and uniaxial tensile properties of GSG initially increase and then decrease as the BF volume fraction rises,with optimal values achieved at a fiber volume fraction of 0.4%.An elastic hardening index is introduced to comprehensively evaluate the toughening effect of BF volume fractions.The f psh value for the control group is 3.613,while the group with a 0.4%BF volume fraction exhibits the highest f psh value of 6.065,representing a 68.2%increase compared to the control group.The addition of BF enhances the dry shrinkage properties of the GSG,with the dry shrinkage rate decreasing as the fiber volume fraction increases.The group with a 1%fiber volume fraction exhibits the lowest 28 day dry shrinkage rate,which is 6.48%lower than that of the control group.By comprehensively analyzing the compressive strength,uniaxial tensile properties,fracture characteristics,and dry shrinkage of the test specimens,along with investigating the microscopic

关 键 词：环境工程学 煤矸石粉 玄武岩纤维 断裂性能 微观特征 

分 类 号：X705[环境科学与工程—环境工程]