高分子固化剂-玄武岩纤维-砂土复合材料强度特性

《复合材料学报》优先在线发表论文。

摘  要：通过单轴抗压、快速剪切和抗拉试验，对高分子固化剂-玄武岩纤维-砂土复合材料(Sand mixed with Polymers and Basalt fiber, PBS)的强度特性进行较为深入的研究，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，并结合试验结果与微观扫描电镜分析了PBS的强度增强机制。试验结果表明：PBS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，且残余抗压强度有随高分子固化剂含量增大而不断提高的趋势；随着高分子固化剂含量和玄武岩纤维含量增加，PBS强度先快速增加，当高分子固化剂和纤维含量分别达到3%和0.6%增幅变缓；随砂土密度的增大，PBS的抗压强度和抗剪强度持续增加，而抗拉强度出现先减小后增大再减小趋势，在密度为1.55g/cm3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。

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

Abstract: The strength characteristics of composite materials (PBS) composed of polymer curing agent, basalt fiber and sand were deeply studied by uniaxial compression test, direct shear test and direct tensile test, the effects of polymer curing agent content, basalt fiber content (by weight of dry sand) and sand density on the strength of composites material were compared and analyzed. And the strength enhancement mechanism of PBS was analyzed with the results of the tests and scanning electron microscope images. The tests results show that: The compressive strength, shear strength and tensile strength of PBS 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 fiber and the polymer curing agent, the strength of PBS is increasing rapidly first, and after polymer curing agent content and the fiber content reaches 3% and 0.6%, the increase is slowed down; With the increase of PBS density, the compressive strength and shear strength of composite material have been increased, and tensile strength decrease first and then to increase and then decrease, reach 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 fiber added into sand can play a reinforcing role in the sand, thereby the strength of the composite sand materials was effectively improved.

Keywords: polymer; basalt fiber; composite sand materials; strength; mechanism analysis

作者：王颖等，河海大学 地球科学与工程学院，南京

通讯作者：刘瑾，河海大学 地球科学与工程学院，南京

全文详见中国知网学术期刊优先数字出版。