高性能纤维增强水泥基复合材料的力学性能试验研究

Experimental study on the mechanical properties of high performance polyvinyl alcohol fiber reinforced cementitious composites

采用聚乙烯醇纤维(Polyvinyl Alcohol,简称PVA纤维)制备高性能纤维增强水泥基复合材料(PVA-ECC),通过立方体抗压强度和梁四点弯曲试验分别研究不同PVA纤维体积掺入量、不同砂胶比以及粉煤灰掺入量对PVA-ECC材料的抗压强度与弯曲性能的影响。结果表明:随着纤维掺入量的增加PVA-ECC抗压强度逐渐降低,但弯曲延性增强。砂胶比的降低使得纤维更好的分散,延性效果得到明显改善。粉煤灰掺量的增加改善了PVA-ECC搅拌时的流动度,梁的抗弯承载力有所降低,但延性提高。

High performance fiber-reinforced cement-based composites（PVA-ECC）were produced based on polyvinyl alcohol fi-bers（ PVA）. The influences of the fiber volume content,sand-binder ratio and fly ash contenton the compressive strength and bending performance of the PVA-ECC material by using cubic compression test and four-point bending test. The results show that the com-pressive strength gradually decreases with an increase in fiber volume content. But the ductility is improved. The lower sand-binder ra-tio can help to improve fiber dispersion,and the ductility is obviously improved. An increase in the fly ash content improves PVA-ECC mixing flowability,reduces the flexural strength,and increases the ductility.