玄武岩纤维水泥土抗拉性能试验研究

福建江夏学院环保节能型高性能混凝土协同创新中心, 福建福州 350108

水泥土; 玄武岩纤维; 劈拉试验; 抗拉强度; 纤维掺量; 塑性; 加筋

Experiment research on tensile strength of basalt fiber cement-soil
Chen Feng

Coordinative Innovation Center for Environmentally Friendly and Energy Saving High Performance Concrete, Fujian Jiangxia University, Fuzhou 350108, Fujian Province, P.R.China

cement-soil; basalt fiber; splitting tensile test; tensile strength; content of fiber; plasticity; reinforcement

DOI: 10.3724/SP.J.1249.2016.02188

备注

为提高水泥土的抗拉性能,利用纤维的加筋增强效果,探讨在水泥土中掺入玄武岩纤维来改善其抗拉性能的方法. 对不同配比的玄武岩纤维水泥土进行劈拉试验,得到相应的抗拉强度及不同的破坏形态. 研究结果表明,玄武岩纤维的掺入能明显提高不同龄期水泥土试件的抗拉强度,但随着纤维掺量的增加,增强效果逐渐减弱,即过多的纤维掺量无法带来更明显的强度增长; 玄武岩纤维的掺入使水泥土的塑性增强,试件破坏时表现出一定的塑性,有利于提高工程稳定性. 根据实验结果建立了不同配比的玄武岩纤维水泥土抗拉强度与抗压强度的关系式,可为实际工程提供参考.

We explore a method to enhance the tensile strength of cement-soil by adding basalt fiber into the soil and conduct splitting tensile tests on the mixture with different proportions of basalt fiber to inspect the tensile strength and different failure modes. We establish the relationship between the tensile strength and the unconfined compression strength of cement-soil with different mixture ratios of basalt fiber. The results show that the addition of basalt fiber can effectively improve the tensile strength of cement-soil specimens at different ages and strengthen the plastic characteristics of cement-soil. However with the increase of fiber content, the enhancement effect on tensile strength is gradually weakened. Too much fiber content is incapable of bringing obvious strength enhancement. The basalt fiber cement-soil specimens give rise to a certain plasticity when they are damaged, thus improving the project stability. These results may provide reference for engineering practices.

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