玄武岩纤维TRC板拉伸性能试验研究

采用短切钢纤维体积掺量为0%、0.8%、1.6%的3种精细混凝土基体分别制备玄武岩纤维TRC板,并对纤维编织网施加不同水平的预拉力,通过单轴拉伸试验,考察了各类TRC板试件的应力-应变关系和裂缝形态.试验结果表明:随着纤维编织网层数的增加,TRC板试件的开裂荷载减小,极限荷载和极限应变均增大,裂缝形态得到很大改善.随着纤维编织网上预拉力水平的增加,TRC板试件的开裂荷载增大,极限荷载并未产生明显变化,极限应变减小,裂缝逐渐表现出不良的形态.TRC板试件的拉伸性能与短切钢纤维掺量和预拉力水平均存在一定的相关性;当基体混凝土中掺加体积分数为1.6%的短切钢纤维且纤维编织网上施加的预拉力大小合适时,TRC板试件表现出相对较好的拉伸性能.

Experimental Study on Tensile Performance of Basalt TRC Plate

Three kinds of fine-grained concrete matrix with chopped steel fibers of 0%,0.8% and 1.6% volume ratios were used to fabricate the basalt TRC plates,and various prestressing were exerted on basalt textile layers. The stress-strain relationship and cracking patterns of TRC plate were investigated by means of uniaxial tensile tests. The obtained results indicate that,with the increase of the number of textile layers,cracking strength of TRC plate decreases,the peak load and strain capacity tend to increase,and cracking patterns are greatly improved. In addition,the increased cracking strength,reduced strain capacity and undesirable cracking patterns are observed with the increase of prestressing,while no obvious change occurs for peak load. Furthermore,the tensile performance of basalt TRC plate is correlated with volume ratios of chopped steel fibers and prestressing. When chopped steel fibers with 1.6% volume ratio are mixed in the matrix and appropriate prestress force is applied to textile layers,the basalt TRC plate exhibits relatively good tensile performance.