EFFECT OF PVA FIBERS ON THE PROPERTIES OF CEMENT- BASED MATERIALS
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摘要: 对一种高性能聚乙烯醇(PVA)纤维在不同掺量下对混凝土和易性、力学性能和抗渗性能的影响展开研究,分析纤维种类及掺量对控制砂浆塑性收缩裂缝的作用机理。结果表明:掺入适量PVA纤维不会对混凝土的和易性产生影响,但当纤维掺量达到6.5 kg/cm3时,会对混凝土的和易性产生负面作用;PVA纤维可以适当提高混凝土抗压强度,显著增加其劈裂抗拉强度,但当掺量超过一定值时,力学性能会有所下降;在水泥基材料中掺入PVA和聚丙烯(PP)纤维,均可有效改善材料的抗裂性能,从而提高其抗渗性能,其中PVA纤维对抗渗性能改善效果更加明显。Abstract: It was investigated that the effects of Polyvinyl Alcohol ( PVA) fiber on the workability,mechanical properties and impermeability of concrete. The influences of PVA and Polypropylene ( PP) fiber on the plastic shrinkage crack of mortar were also studied. Results show that PVA fiber has no negative effect on the workability in a certain range,but exerts an adverse effect when the addition is up to 6. 5 kg/cm 3. The PVA fiber in concrete can improve the compressive strength performance,especially the splitting tensile strength of concrete. When PVA and PP fibers are mixed into cement-based materials,crack resistance and impermeability are effectively improved.
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Key words:
- PVA fiber /
- crack /
- compressive strength /
- splitting tensile strength /
- impermeability
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