纤维参数对水泥基材料减裂效果的影响  

Effect of Fiber Parameters on Crack Reduction of Cement Based Materials

作　　者：马一平[1] 余少同 游璐[1] 孟瑞 杨晓杰[1] MA Yiping;YU Shaotong;YOU Lu;MENG Rui;YANG Xiaojie(Key Laboratory of Advanced Civil Engineering Materials of Education Ministry,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学先进土木工程材料教育部重点试验室,上海201804

出　　处：《建筑材料学报》2018年第5期797-802,共6页Journal of Building Materials

基　　金："十三五"国家重点研发计划资助项目(2016YFB0303200)

摘　　要：系统研究了高性能聚乙烯醇(PVA)纤维(弹性模量≥40GPa)对水泥基材料塑性及早期硬化阶段收缩开裂减裂效果的影响.结果表明:掺入高性能PVA纤维可有效防止水泥基材料收缩开裂,随着纤维掺量和长度的增加,开裂权重值逐渐减小;直径较小的纤维在塑性阶段减裂效果更好,而高弹性模量的纤维在硬化阶段表现更加优异;在同等条件下,高性能PVA纤维的硬化减裂率明显高于聚丙烯(PP)纤维.The effect of high performance polyvinyl alcohol(PVA)fibers(E≥40 GPa)on the plastic and early hardening shrinkage cracking of cement-based materials was studied systematically.The experimental results show that weighted values of the cracking reduce with the increase of the fiber content and length.In the plastic stage,fiber with smaller diameters has a significant influence on the cracking effect while fiber with a higher elastic modulus performs better in the early hardening shrinkage stage.In addition,the crack reduction rate by PVA fiber is much higher than that of polypropylene(PP)fiber on hardening shrinkage cracking under the same conditions.

关 键 词：高性能纤维 塑性收缩开裂 早期硬化 减裂率 

分 类 号：TB321[一般工业技术—材料科学与工程]