挤压纤维增强水泥板及复合梁抗弯与耐久性能.pdf

学兔兔 第31卷第6期 土木 建 筑 与 环 境 工 程 Vo1．31 NO．6 2009年 12月 Journal of Civil．Architectural Environmental Engineering Dec．2009 挤压纤维增强水泥板及复合梁抗弯与耐久性能 张 君，李启宏，侯东伟 (清华大学 土木5-程系结构工程与振动教育部重点实验室，北京 100084) 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。 关键词：挤压成型；纤维增强水泥板；力学性能；耐久性能 中图分类号：TU528 文献标志码：A 文章编号：1674～4764(2009)06—0081—05 Mechanical Properties and Durability of Extruded Fiber Reinforced Cement Mortar Board and Its Composite Beam ZHANG Jun，u Qi—hong，HOU Dong—wei (Department of Civil Engineering，Key Laboratory of Structural Engineering and Vibration of Education Ministry，Tsinghua University，Beijing 100084，P．R．China) Abstract：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 0n 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 fi ber reinforced extruded board as base，the ultimate bending strength，as well as and the corresponded deflection and the resistant to chloride iron penetrating， w