钢网片-聚乙烯纤维增强水泥基复合材料中低速动态拉伸性能试验研究  

Test Study on Dynamic Tensile Behaviors of Steel Grid-Polyethylene Fiber Reinforced Engineered Cementitious Composites at Low and Medium Loading Rates

作　　者：李亮[1] 栾贻恒 吴俊[2] 杜修力[1] 吴文杰 LI Liang;LUAN Yiheng;WU Jun;DU Xiuli;WU Wenjie(Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China;School of Urban Railway Transportation,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]上海工程技术大学城市轨道交通学院,上海201620

出　　处：《材料导报》2022年第5期49-54,共6页Materials Reports

基　　金：国家自然科学基金面上项目(52078288);北京市自然科学基金项目(8212001)。

摘　　要：本工作开展了钢网片-聚乙烯(PE)纤维增强水泥基复合材料的中低速动态拉伸性能试验研究,研究了其破坏状态、强度特性和能量吸收特性,并研究了纤维体积含量、钢网片层数和拉伸速率对其动态拉伸性能的影响。试验结果表明:PE纤维和钢网片的添加提高了水泥基复合材料的抗拉强度、变形能力与耗能能力。相对于基体材料,钢网片-PE纤维水泥基复合材料具有较为显著的增强和增韧效应。钢网片的主要作用是提高材料的抗拉强度,PE纤维的主要作用是提高材料的变形能力和耗能能力。纤维体积含量、钢网片层数和拉伸速率均对钢网片-PE纤维水泥基复合材料的动态拉伸性能有一定程度的影响。随着PE纤维体积含量的增加,材料的抗拉强度和耗能能力逐渐提高,当拉伸速率为1 mm/min时,纤维体积含量为0.5%的试件峰值应力比基体试件提高了约17%。随着钢网片层数的增加,材料的抗拉强度有较大幅度的提高,添加一层和两层钢网片的试件峰值应力比基体试件分别提高了约65%和192%;但此时材料的变形能力降低。随着拉伸速率的增大,材料的抗拉强度逐渐提高。在中等拉伸速率条件下,材料仍表现出明显的应变硬化性质,具有良好的韧性和耗能能力。The dynamic tensile tests of the steel grid-polyethylene(PE)fiber reinforced engineered cementitious composites(ECC)were carried out at low and medium loading rates.The failure state and characteristic of tensile strength and energy dissipation of the steel grid-PE fiber reinforced ECC were investigated.The effects of fiber volume content,number of steel grid layers and tensile rate on the dynamic tensile behaviors of the steel grid-PE fiber reinforced ECC were also investigated.It is indicated by the test results that:the ultimate tensile strength,ductility and energy dissipation performance of the ECC are improved by the addition of steel grids and PE fibers.Compared to the matrix material,the steel gridPE fiber reinforced ECC shows remarkable improvement phenomena of ultimate tensile strength and energy dissipation.The steel grid mostly enhances the ultimate tensile strength of the ECC,and the PE fiber mostly improves the ductility and energy dissipation performance of the ECC.The fiber volume content,number of steel grid layers and tensile rate all impact the dynamic tensile behaviors of the steel grid-PE fiber reinforced ECC to a certain extent.The ultimate tensile strength and energy dissipation performance of the reinforced ECC can be enhanced with the increase of fiber volume content.For the tensile rate of 1 mm/min,an increase of about 17%is recorded for the peak stress of the reinforced ECC with a fiber volume content of 0.5%compared to the matrix material.The ultimate tensile strength of the reinforced ECC reveals remarkable enhancement with the increase of the number of steel grid layers.The peak stress of the reinforced ECC with one layer or two layers of steel grid increases by about 65%and 192%compared to the matrix material,respectively.But the deformation capability of the reinforced ECC shows deterioration with the increase of the number of steel grid layers.The ultimate tensile strength of the reinforced ECC can be enhanced with the increase of tensile rate.The reinforced ECC reveals obvious st

关 键 词：水泥基复合材料 钢网片 聚乙烯纤维 动态拉伸性能 耗能能力 

分 类 号：TU528.585[建筑科学—建筑技术科学]