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采用高弹模聚乙烯纤维(PE)和低弹模聚丙烯粗合成纤维(CPP)混杂技术制备混杂纤维混凝土,对其抗压和抗弯性能进行测试,并采用双因素方差分析法对弯曲韧性影响因素的显著性特征进行了分析,同时还对混杂纤维的增强增韧机理进行了探讨.结果表明:在不同的粗集料掺量下,混杂纤维混凝土抗压强度普遍高于素混凝土,其提高幅度主要集中在15%~30%之间;掺入混杂纤维后混凝土试件的荷载-挠度曲线整体较为饱满,多数曲线表现为变形缓慢软化,部分出现变形硬化特征;纤维掺量对混凝土的韧性有非常显著的影响,而粗集料掺量影响较小;CPP/PE纤维可以从不同层次结构对混凝土进行增韧,产生正混杂效应,从而使制备的混杂纤维混凝土具有优异的韧性.
The hybrid fiber concrete was prepared by the hybrid technology of high modulus polyethylene (PE) and low modulus polypropylene (CPP) synthetic fiber. The compressive and flexural properties of the hybrid fiber reinforced concrete were tested. The two-factor analysis of variance The paper analyzes the salient features of influencing factors and the toughening mechanism of hybrid fibers.The results show that the compressive strength of hybrid fiber reinforced concrete is generally higher than that of plain concrete under different coarse aggregate contents, The range of increase is mainly between 15% and 30%. The load-deflection curves of the concrete specimens with mixed fibers are relatively full, most of the curves show softening deformation and some deformation and hardening characteristics. Toughness has a very significant impact, while the amount of coarse aggregate less affected; CPP / PE fibers from different levels of the structure of the concrete toughening, resulting in a positive hybrid effect, so that the prepared hybrid fiber concrete has excellent toughness.