纤维增强流动性再生混凝土强度和收缩性能试验研究

Experimental Study on Strength and Shrinkage Performance of Fiber-reinforced Fluid Recycled Concrete

为了探究钢纤维和聚丙烯纤维对流动性再生混凝土强度和收缩性能的影响,以流动性普通混凝土为基准,研究和分析了再生骨料、钢纤维和聚丙烯纤维掺量的改变对其强度和收缩性能的影响变化。结果表明:随着再生骨料掺量的增加,不同混凝土强度均有所降低,且随着龄期增加收缩率均呈上升趋势;钢纤维可以增强再生混凝土的强度,聚丙烯纤维可以改善再生混凝土韧性;两种纤维对抑制流动性再生混凝土收缩都同样显著,合理的纤维掺量可使再生骨料掺量小于40%的混凝土的收缩率达到普通混凝土水平。

To investigate the effect of steel fiber and polypropylene fiber on strength and shrinkage properties of fluidity recycled concrete, based on the fluidity ordinary concrete, the effects of different recycled aggregate, steel fiber and polypropylene fiber on the strength and shrinkage performance of fluid recycled concrete were studied. The results show that with the increase of recycled aggregate content, the strength of different concrete decreases and the shrinkage rate increases at different ages. Steel fiber can enhance the strength of recycled concrete, and polypropylene fiber can improve the toughness of recycled concrete. They are also significant for the suppression of fluidity of recycled concrete.The reasonable fiber content can make the shrinkage of recycled concrete with less than 40% recycled aggregate reach the level of ordinary concrete.