橡胶粉对PVA纤维增强水泥基复合材料韧性的影响  

Effect of rubber powder on the toughness of PVA fiber reinforced cement-based composites

作　　者：胡苗[1] 周娟兰[1] 李永鹏 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]郑州市市政工程勘测设计研究院,河南郑州450052

出　　处：《混凝土》2015年第4期108-110,114,共4页Concrete

基　　金：国家"十二五"科技支撑计划项目(2011BAE27B04);教育部博士点基金项目(20130205110013);长安大学中央高校基本科研业务费专项资金资助(2013G3312018;2014G1311081)

摘　　要：为了研究橡胶粉对纤维增强水泥基复合材料韧性的影响,采用橡胶粉制备PVA纤维增强水泥基复合材料,对其强度和韧性性能进行测试,并采用SEM对试件断面微观形貌进行了分析。结果表明,加入橡胶粉以后,复合材料的抗压强度出现降低,抗折强度先增大后下降,而韧性性能迅速上升;试件底部出现了多缝开裂;当橡胶粉用量为15%时,试件出现了明显应变硬化现象;当橡胶粉用量过大时,韧性反而下降。此外,结合微观力学原理,对橡胶粉的增韧机理进行了阐述。It studied the effect of rubber powder on the toughness of PVA fiber reinforced cement-based composites. Rubber powder was used to prepare PVA fiber reinforced cement-based composites and its strength and toughness properties was tested. The micromorphology of the cross-section for specimens was analyzed using SEM. The results showthat the compressive strength of the composite is lower and flexural strength increased first but then decreased,toughness performance is rising rapidly; the multiple cracking appears at the bottom of specimens; the specimen appeared obvious strain hardening phenomenon when the amount of rubber powder is15%; but,the toughness become worse with excessive amount of rubber powder. Finally,the toughening mechanism of rubber powder was analyzed combined with micro-mechanics principles.

关 键 词：橡胶粉 PVA纤维 水泥基复合材料 韧性 

分 类 号：TU528.041[建筑科学—建筑技术科学]