水泥粉煤灰稳定炉渣煤矸石混合料抗冻试验  

Frost resistance test of slag coal gangue mixture stabilized by cement and fly ash

作　　者：童彧斐 严鹏飞 张虎彪 延常玉 李宏波[1,2,3] TONG Yufei;YAN Pengfei;ZHANG Hubiao;YAN Changyu;LI Hongbo(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Ningxia Research Center of Technology on Water-Saving Irrigation and Water Resources Regulation,Yinchuan 750021,China;Ningxia Center of Research on Earthquake Protection and Disaster Mitigation in Civil Engineering,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]宁夏节水灌溉与水资源调控工程技术研究中心,银川750021 [3]宁夏土木工程防震减灾工程技术研究中心,银川750021

出　　处：《中国科技论文》2022年第10期1078-1083,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(52069025);宁夏回族自治区重点研发计划项目(2020BDE03005,2021BDE92002);宁夏高等学校一流学科(水利工程学科)资助项目(NXYLXK2021A03)。

摘　　要：为研究水泥粉煤灰稳定炉渣煤矸石混合料的抗冻性能,选取了5种炉渣替代率和4种水泥掺量的混合料进行冻融循环试验,分析了炉渣替代率、水泥掺量和冻融循环次数对混合料宏观表象、质量变化和无侧限抗压强度损伤量的影响规律。结果表明:随着冻融循环次数的增加,无侧限抗压强度损伤量增大;随着炉渣替代率的增大,无侧限抗压强度损伤量呈先减小后增大的趋势,当炉渣替代率为50%时,抗冻性能最优;强度衰减是由于凝胶体剥落流失、试件内部裂缝逐步发展贯穿所致。建立了冻融循环作用下相对动弹性模量和相对抗压强度之间的强度衰减模型,以便于评价混合料的抗冻性能。In order to study the frost resistance of cement and fly ash stabilized slag coal gangue mixture,five slag replacement rates and four cement contents were selected to carry out freeze-thaw cycle tests.The effects of slag replacement rate,cement content and freeze-thaw cycles on macroscopic appearance,quality change and unconfined compressive strength damage of the mixture were analyzed.The results show that the damage of unconfined compressive strength increases with the increase of freeze-thaw cycles.With the increase of slag replacement rate,the damage of unconfined compressive strength first decreases and then increases.When slag replacement rate is 50%,the frost resistance is the best.The strength attenuation is due to the loss of gel exfoliation and the gradual development of cracks in the specimen.The strength attenuation model between the relative dynamic elastic modulus and the relative compressive strength under freeze-thaw cycles is established,which is convenient to evaluate the frost resistance of the mixture.

关 键 词：炉渣煤矸石混合料 冻融循环 超声波检测 相对动弹性模量 

分 类 号：U416.25[交通运输工程—道路与铁道工程]