钢-PVA混杂纤维高性能混凝土抗渗性能试验研究

Permeability Resistance Test of Steel-PVA Hybrid Fiber High Performance Concrete

为探究钢纤维掺量、聚乙烯醇(PVA)纤维掺量和矿粉掺量对钢-PVA混杂纤维高性能混凝土(HFHPC)抗渗性能的影响,本文开展了钢-PVA HFHPC抗渗性能试验,并对试验结果进行了极差分析、方差分析和回归分析。结果表明:对HFHPC抗渗性能的影响程度从高到低依次为钢纤维、矿粉和PVA纤维。在试验水平范围内,得出混凝土试件抗渗性能最佳水平组合:钢纤维体积掺量1.0%、PVA纤维体积掺量0.7%、矿粉质量取代率20%。当钢纤维掺量超1.0%时,HFHPC抗渗性能略有下降,但仍高于基准素混凝土。最后采用多元回归分析,建立了HFHPC渗透系数与钢纤维、PVA纤维和矿粉的预测模型。

In order to investigate the effects of steel fiber,polyvinyl alcohol(PVA)fiber and mineral powder contnet on permeability resistance of steel-PVA hybrid fiber high performance concrete(HFHPC).The orthogonal experiment was designed to conduct the permeability resistance test of steel-PVA HFHPC,and the test results were analyzed through range analysis,variance analysis and regression analysis.The results show that the influence degree on the impermeability of HFHPC is steel fiber,mineral powder and PVA fiber from high to low.In the range of test level,the optimal horizontal combination of impermeability of concrete specimens is as follows:steel fiber volume fraction of 1.0%,PVA fiber volume fraction of 0.7%and slag powder mass replacement rate 20%.When the steel fiber volume fraction exceeds 1.0%,the impermeability of HFHPC decreases slightly,but it is still higher than that of standard plain concrete.Finally,multiple regression analysis is used to establish the prediction model of HFHPC permeability and steel fiber,PVA fiber and mineral powder.