冻融循环后固化粉煤灰的力学特性研究  

Study on the Mechanical Properties of Solidified Fly Ash after Freeze-thaw Cycling

作　　者：魏威 廖亚雄 袁盛杰 赵沂伟 WEI Wei;LIAO Ya-xiong;YUAN Sheng-jie;ZHAO Yi-wei(Hubei Provincial Communication Planning and Design Institute Co.,Ltd.,Wuhan,Hubei 430051,China)

机构地区：[1]湖北省交通规划设计院股份有限公司,湖北武汉430051

出　　处：《黑龙江交通科技》2023年第8期20-22,共3页Communications Science and Technology Heilongjiang

摘　　要：为了研究冻融循环后固化粉煤灰的力学特性,采用冻融循环试验箱对不同剂量的试件进行冻融循环,单次冻融循环过程控制在8 h以内,对比冻融循环前后力学特性的变化。结果表明:常规掺量下,采用固化粉煤灰填筑台背至少可减少约30%的附加应力;随着冻融循环次数的增加,在水体积变化影响下,抗压强度与动应力初期衰减较大,4次以后逐渐趋缓;水稳定性随着固化剂掺量的增加而增加,但冻融循环后水稳定系数的差值呈递增趋势;根据固化粉煤灰在冻融循环下性能的衰减与城市道路路基设计规范要求,建议固化剂掺量为5%~7%。In order to study the mechanical properties of solidified fly ash after the freeze-thaw cycling,a freeze-thaw cycling test box was used to perform freeze-thaw cycling on different doses of test blocks.The process of a single freeze-thaw cycling was controlled within 8 hours,and the mechanical characteristics before and after the freeze-thaw cycling were compared.The results show that the use of solidified fly ash to fill the back of the platform can reduce the additional stress by at least about 30%under the conventional dosage;with the increase of the number of freeze-thaw cycling,the compressive strength and dynamic stress are affected by the volume change of water.The initial attenuation is large,and gradually slows down after 4 times;the water stability increases with the increase of the curing agent content,but the difference in the water stability coefficient after the freeze-thaw cycling shows an increasing trend;according to the solidified fly ash in the freeze-thaw cycling for the attenuation of lower performance and the specification requirements of urban road subgrade design,the recommended dosage of curing agent is 5%~7%.

关 键 词：固化粉煤灰 冻融循环 抗压强度 水稳定性 动应力 

分 类 号：U416.1[交通运输工程—道路与铁道工程]