纤维混杂超高性能混凝土流动性与抗压强度研究

Study on Flowability and Compressive Strength of Hybrid Fiber Reinforced Ultra⁃high Performance Concrete

纤维能够提升超高性能混凝土(UHPC)的抗压强度,同时影响UHPC的流动性。通过有机纤维与钢纤维混杂、长短PVA纤维混杂等方式,研究有机纤维种类和掺量对UHPC拌合物性能和抗压强度的影响,分析混杂方式对UHPC扩展度的影响。研究表明,随着纤维掺量的增加,UHPC扩展度降低,工作性能变差;有机纤维对UHPC基体的流动性影响较小。有机纤维与钢纤维混杂UHPC比同掺量钢纤维UHPC抗压强度有所降低,最大降低幅度为15%。

Fibers can enhance the compressive strength of ultra-high performance concrete(UHPC),meanwhile,affect its liquidity.The effects of organic fiber types and mixing amounts on the performance and compressive strength of UHPC mixtures were investigated by mixing organic fibers with steel fibers and mixing long and short PVA fibers,and the effects of the blending methods on the expansion of UHPC were analyzed.The study shows that with the increase in fiber admixture,UHPC extensibility decreases and the working performance worsens.Organic fibers have little effect on the liquidity of UHPC matrix.The compressive strength of UHPC mixed with organic fiber and steel fiber is lower than that of UHPC mixed with steel fiber with the same mixing amount,and the maximum reduction is 15%.