Test Study on Dynamic Tensile Behaviors of Steel Grid-Polyethylene Fiber Reinforced Engineered Cementitious Composites at Low and Medium Loading Rates
LI Liang1, LUAN Yiheng1, WU Jun2, DU Xiuli1, WU Wenjie1
1 Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China 2 School of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai 201620, China
Abstract: 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 grid-PE 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 1mm/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 strain hardening behavior and has considerable ductility and energy dissipation performance at medium tensile rates.
李亮, 栾贻恒, 吴俊, 杜修力, 吴文杰. 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[J]. 材料导报, 2022, 36(5): 20120031-6.
LI Liang, LUAN Yiheng, WU Jun, DU Xiuli, WU Wenjie. Test Study on Dynamic Tensile Behaviors of Steel Grid-Polyethylene Fiber Reinforced Engineered Cementitious Composites at Low and Medium Loading Rates. Materials Reports, 2022, 36(5): 20120031-6.
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2022, Vol. 36 
