摘要
研究了水灰比、纤维种类、掺量和水泥基材对挤压成型纤维水泥板及其复合梁的力学性能与耐久性能的影响。结果表明掺加纤维后板材韧性有显著改善;PVA纤维增强板材当纤维掺量达1.7%时表现应变硬化,出现多点开裂;PP纤维则呈现应变软化。两种纤维增强水泥基材料性能的差异是由于纤维自身性能的不同。以纤维增强板为底板,制作的纤维板/混凝土复合梁的极限荷载和相应挠度,与普通混凝土梁相比都得以改善;同时与普通混凝土梁相比,复合梁的抗氯离子渗透性能更好。
The effect of water to cement ratio, fiber types and content, cement types on the bending performance of the extruded fiber reinforced cementitious board were studied. And it was found that polyvinyl alcohol （PVA） fibers can significantly improve the ductility of the board compared with polypropylene （PP） fibers. As PVA fiber content achieved 1. 7%, the strain hardening and multiple cracking were occurred on the extruded board, while strain-softening were shown on PP fiber reinforced cement board. The difference between the two kinds of board was from the differences of the mechanical properties of the two fibers. In addition, taking the fiber reinforced extruded board as base, the ultimate bending strength, as well as and the corresponded deflection and the resistant to chloride iron penetrating, was improved for a composite beam with fiber board and concrete compared with those of traditional concrete beam.
出处
《土木建筑与环境工程》
CSCD
北大核心
2009年第6期81-85,共5页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金资助项目(50878119)
关键词
挤压成型
纤维增强水泥板
力学性能
耐久性能
extrusion molding
fiber reinforced cement board
mechanical property
durability
