“刚性防水和混凝土结构自防水”系列报道之十一 城际铁路桥面混凝土防水保护层的性能研究

Performance Study on Concrete Protection Layer for Intercity Railway Bridge Deck Waterproofing

选用聚丙烯腈纤维(PAN)、聚丙烯纤维网(PPW)、聚丙烯纤维(PP)以及聚乙烯醇纤维(PVA),研究纤维种类及掺量对混凝土工作性能及抗塑性开裂性能的影响。结果表明:PP掺量0.15%或PVA掺量0.1%时,均对混凝土的塑性开裂有良好的抑制作用,同时对其工作性能影响较小,更适用于C40细石纤维混凝土桥面防水保护层。

This article studies the influence of fiber type with different dosages including polyacrylonitrile fiber （PAN）, polypropylene fiber net（PPW）, polypropylene fiber（PP） and polyvinyl alcohol fiber（PVA） on concrete serviceability and plastic shrinkage cracking resistance. The results show that when the dosage of PP is 0.15% or the dosage of PVA is 0.1%, the concrete has good resistance to plastic shrinkage cracking and a small impact on serviceability. PP and PVA are suitable for C40 fine stone and fiber concrete, which is used for concrete protection layer of bridge deck waterproofing.