随着胶凝砂砾石坝(CSG Dam)的应用,对CSG材料的力学性能研究亦有所增加。为改善CSG材料的强度及破坏变形率等力学性能,选取天然砂砾石为原材料,采取等骨料级配及砂率,通过掺和纤维及选用不同胶凝材料用量、龄期等参数以正交试验方法研究设计配合比,并通过试验及回归方程分析CSG材料力学性能。结果表明:CSG材料掺和PVA纤维能较好地改善原材料的延性,且将试件破坏形态由脆性破坏转化为延性破坏,特别是掺入3%PVA纤维时,试件的抗压及劈拉强度均达到最大值。研究成果可为CSG今后在坝体材料上的推广运用提供科学依据。
Abstract
Research on the mechanical properties of cemented sand and gravel (CSG) materials has been increasing along with the application of CSG Dam. In order to improve the mechanical properties such as strength and deformation rate of CSG materials, we added fibers into natural sand and gravels with identical aggregate gradation and sand ratio, and investigated into the mix proportion by adjusting cement content and age through orthogonal experimental design. According to tests and regression equation, we conclude that the dosage of PVC-fiber effectively improved the ductility of CSG material, and converted the brittle fracture of CSG specimens into ductile fracture. In particular, the compression and split strength of specimens reached the maximum when PVC fiber proportion was 3%.
关键词
胶凝砂砾石 /
PVA纤维 /
抗压强度 /
影响因素 /
正交试验 /
力学性能
Key words
cemented sand and gravel /
PVC-fiber /
compressive strength /
influential factors /
mechanical properties
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基金
吉林省教育厅"十三五"科学技术研究项目(2016251);延边大学青年基金项目(2015004);延边大学大学生创新创业项目(ydbksky2016004)
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