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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 influence of steel fiber and polypropylene fiber hybrid on the high temperature performance of reactive powder concrete, the effect of single and mixed steel fiber and polypropylene fiber on the compressive strength and flexural strength of concrete under high temperature was studied. The results show that the compressive strength and flexural strength of concrete increase at first and then decrease with the increase of temperature when the two kinds of fibers are singly blended. The strength of concrete after high temperature is significantly increased, The more the increase rate is larger, while the polypropylene fiber only improves the high temperature resistance of the reactive powder concrete when the temperature is higher than 200 ℃; the fiber mixing significantly improves the high temperature performance of the concrete, the steel fiber withstands the high temperature The improvement of flexural strength and tensile strength is much better than that of polypropylene fiber.