玄武岩-聚乙烯醇混杂纤维水泥基材料的耐久性研究

确定了玄武岩-聚乙烯醇混杂纤维水泥基材料的最优配合比,将玄武岩-聚乙烯醇混杂纤维水泥基材料与普通C40混凝土在相同条件下进行耐久性对比实验。结果表明,玄武岩-聚乙烯醇混杂纤维水泥基材料在300次冻融循环后,质量损失不到1.5%,而在不到150次冻融循环中,普通C40混凝土的质量损失已接近5%;混杂纤维水泥基材料28和56 d的渗透系数为普通C40混凝土的53%和26%,混杂纤维水泥基材料具有较强的抗渗透能力,抗渗性随着龄期增长逐渐增强;碳化时间<28 d时,混杂纤维水泥基材料的碳化深度大于普通C40混凝土,但碳化时间56 d时,混杂纤维水泥基材料的碳化深度为普通C40混凝土的90%;混杂纤维水泥基材料28和56 d的电通量分别为普通C40混凝土的65%和49%,混杂纤维水泥基材料的抗氯离子性能明显高于普通C40混凝土。玄武岩-聚乙烯醇混杂纤维水泥基材料的各项耐久性指标均优于普通C40混凝土。

Study on durability of basalt -polyvinyl alcohol hybrid fiber cement-based materials

The optimal mix proportion of basalt PVA hybrid fiber cement-based materials was determined,and the durability of basalt PVA hybrid fiber cement-based materials was compared with common C40 concrete under the same conditions.The results showed that the mass loss of basalt PVA hybrid fiber cement-based materials was less than 1.5%after 300 freeze-thaw cycles,while that of ordinary C40 concrete was close to 5%in less than 150 freeze-thaw cycles.The permeability coefficients of 28 and 56 days of hybrid fiber cement-based materials were 53%and 26%of that of ordinary C40 concrete.Hybrid fiber cement-based materials had strong permeability resistance,and the permeability resistance gradually increased with age.When the carbonation time was less than 28 days,the carbonation depth of hybrid fiber cement-based materials was greater than that of ordinary C40 concrete,but when the carbonation time was 56 days,the carbonation depth of hybrid fiber cement-based materials was 90%of that of ordinary C40 concrete.The electric flux of hybrid fiber cement-based materials in 28 and 56 days was 65%and 49%of that of common C40 concrete,respectively.The chloride resistance of hybrid fiber cement-based materials was significantly higher than that of common C40 concrete.The durability indexes of basalt PVA hybrid fiber cement-based materials were better than that of common C40 concrete.