高分子固化剂-玄武岩纤维/砂土复合材料强度特性  

Strength characteristics of polymer curing agent-basalt fiber/Sand composites

作　　者：王颖 刘瑾[1] 白玉霞[1] 李鼎 李思远 刘伟汉 WANG Ying;LIU Jin;BAI Yuxia;LI Ding;LI Siyuan;LIU Weihan(School of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学地球科学与工程学院

出　　处：《复合材料学报》2019年第10期2407-2417,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金面上项目(41472241);江苏省水利科技项目重大技术攻关项目(2017010);中央高校基本科研业务费(2016B05914)

摘　　要：通过单轴抗压、快速剪切和抗拉试验,对高分子固化剂(PCA)-玄武岩纤维/砂土复合材料(Sand mixed with polymers and basalt fiber,PBS)的强度特性进行较深入的研究,对比分析了高分子固化剂含量、玄武岩纤维含量(与砂的质量比)和砂土密度对复合砂土材料强度的影响,并结合试验结果和SEM分析了PCA-BF/砂土的强度增强机制。试验结果表明:PCA-BF/砂土的抗压强度、抗剪强度和抗拉强度与纯砂土相比均有明显增强,且残余抗压强度随高分子固化剂含量增大而不断提高;随着高分子固化剂含量和玄武岩纤维含量增加,PCA-BF/砂土强度先快速增大,当PCA和纤维含量分别达到3%和0.6%时增幅变缓;随砂土密度的增大,PCA-BF/砂土的抗压强度和抗剪强度持续增大,而抗拉强度先减小后增大再减小,在砂土密度为1.55g/cm3时达到最大抗拉强度。高分子固化剂能够在砂粒之间形成空间网络,使分散的砂土颗粒连接成为一体,且纤维与土体混合后能够起到拉筋作用,从而共同作用有效改善了复合砂土材料的强度特性。The strength characteristics of materials composed of polymer curing agent(PCA)-basalt fiber(BF)/sand composite were deeply studied by uniaxial compression test,direct shear test and direct tensile test,the effects of polymer curing agent content,basalt fiber content(mass ratio to dry sand)and sand density on the strength of the composites were compared and analyzed.And the strength enhancement mechanism of PCA-BF/Sand was analyzed based on the results of the tests and SEM images.The test results show that:The compressive strength,shear strength and tensile strength of PCA-BF/Sand are obviously enhanced after mixed with basalt fiber and polymer curing agent,and the residual compressive strength increases with the increase of content of polymer curing agent.With the increase of the content of basalt fiber and the polymer curing agent,the strength of PCA-BF/Sand increases rapidly first,and when the polymer curing agent content and the fiber content reach 3%and 0.6%,the increase is slowed down.With the increase of PCA-BF/Sand density,the compressive strength and shear strength of the composites have been increased,and the tensile strength decreases first and then increases and then decreases and reaches maximum at a density of 1.55g/cm3.With evaporation of water,polymer curing agent formed space network between sand particles,therefore,scattered sand were connected with each other to become an integral whole,and the basalt fiber added into sand can play a reinforcing role in the sand,thereby the strength of PCA-BF/Sand composite was effectively improved.

关 键 词：高分子固化剂 玄武岩纤维 复合砂土材料 强度 机制分析 

分 类 号：TU122[建筑科学—建筑理论]