混杂纤维活性粉末混凝土耐高温性能研究

Research on High-temperature Resistance Performance of Hybrid-fiber Reactive Powder Concrete

为了研究钢纤维、聚丙烯纤维混杂对活性粉末混凝土耐高温性能的影响,文章通过试验研究了钢纤维和聚丙烯纤维单掺、混杂对混凝土经受高温后的抗压强度和抗折强度的影响。结果表明:单掺两种纤维时,混凝土抗压强度和抗折强度都随温度的升高表现出先增大后减小的变化趋势;钢纤维能显著提高混凝土经受高温后的强度,且掺量越多提高幅度越大,而聚丙烯纤维只是在温度高于200℃时才对活性粉末混凝土的耐高温性能有改善作用;纤维混杂显著提高了混凝土的耐高温性能,钢纤维对经受高温后的抗折强度和抗拉强度的改善效果远大于聚丙烯纤维。

In order to study the effect of steel fiber and polypropylene fiber hybrid on the high-temperature resistance performance of reactive powder concrete,this article,through the experiments,studied the effect on the compressive strength and flexural strength of concrete after the high temperatures by the individual addition and hybrid mixing of steel fiber and polypropylene fiber.The results showed that：when individually adding these two fibers,the compressive strength and flexural strength of concrete exhibited the changing trend of first increase and then decrease with the increasing temperature;the steel fiber can significantly improve the strength of concrete after subjected to high temperatures,and the more addition content,the greater the increase rate,while the polypropylene fibers can improve the high-temperature resistance performance of reactive powder concrete only when the temperature is above 200 ℃;the fiber hybrid significantly improved the high temperature resistance performance of concrete,and the steel fiber had much greater improving effect on the tensile strength and flexural strength after subjected to high temperatures than polypropylene fibers.