玄武岩纤维布的力学性能和强度利用率研究

RESEARCH ON MECHANICAL PROPERTIES AND STRENGTH EFFICIENCY OF BASALT FIBER FABRIC-REINFORCED EPOXY COMPOSITES

针对不同生产厂家、不同编织方式、不同单位面积质量的玄武岩纤维布,开展市场抽样并分成10个试验组。对其进行复合材料拉伸性能试验,获得抗拉强度、弹性模量、伸长率及应力-应变关系等力学性能参数。随后采用其中单向、双向布各一组进行外包加固素混凝土柱的轴压试验,重点分析破坏时环向断裂应变与材性试验极限应变的比值。研究表明:单向布的力学性能及质量稳定性良好且优于双向布,双向布的抗拉强度标准值较单向降低了25%左右;玄武岩纤维布强度利用率随着层数的增加而增加,与编织方式无关;1层、2层加固素混凝土方柱的有效应变系数分别约为21%、40%,加固圆柱分别约为31%、48%。

For different weaving methods, different mass per unit area , different manufacturers of basal I fiber fabric reinforced (BFRP ), the sampling survey was conducted and 10 experimental groups were made. The tensile strength, elastic modulus , elongation and stress-strain relationship of BFRP composites were obtained by tensile tests. Then two groups of unidirectional and bidirectional fabric composites were selected and used for the axial compression test of confined concrete cylinders. The results showed that: the mechanical properties and quality stability of unidirectional fabric was well and superior to that of bidirectional fabric. The standard tensile strength of bidirectional fabric composite was 25% lower than that of unidirectional fabric.With same layers, the effect of weaving method had little effect on the strength efficiency of composite materials, and the strength efficiency increased with the increase of confined layers. The efficiency strain factors of single-layer and double-layer of basalt fiber fabric composite confined concrete square columns were 21 % and 40% and confined concrete cylinders were 31 % and 48%.