摘要
针对聚丙烯粗合成纤维与水泥基体界面粘结性能差的问题,采用聚丙烯酰胺溶液对其进行浸泡处理,并通过纤维拔出试验、显微硬度测试、X射线衍射分析和扫描电镜分析等,分析了聚丙烯酰胺对粗合成纤维/基体界面性能的影响.结果表明:经聚丙烯酰胺处理后,纤维/基体界面粘结性能提高,纤维拔出曲线更为饱满,脱粘现象延后,并且随着聚丙烯酰胺处理液中聚丙烯酰胺含量的增大,其效果更为明显;处理后的界面区CH晶体减少,界面显微硬度增大,过渡层厚度变薄,CH、C-S-H和AFt交织生长,水化产物结构致密度提高,纤维与水泥基体界面薄弱区明显得到改善.
In order to overcome the poor bond performance of macro-synthetic polypropylene fiber / cement matrix,macro-synthetic polypropylene fiber was soaked in polyacrylamide solution,and fiber pullout test,microhardness test,X-ray diffraction analysis and scanning electron microscopy analysis were subsequently carried out to evaluate the effect of polyacrylamide on the interfacial properties of fiber / cement matrix. The results show that fiber / matrix interfacial bond properties improve due to the treatment with polyacrylamide solution; for instance,the fiber pullout curve becomes fuller and the interfacial debond postpones. Moreover,significant improvement can be observed with the increase of polyacrylamide content in the solution. It is also found from microanalysis that the treatment results in a decrease of CH crystal in the interfacial region,an increase of interface microhardness,a thinner transition layer as well as a densified hydration products structure with alternate CH,C-S-H and AFt. Thus,the weak area between the fiber and the cement matrix improves significantly.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第2期133-138,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
教育部高等学校博士学科点专项科研基金博导类资助课题(20130205110013)
中国博士后科学基金资助项目(2014M552397
2013M532005)
陕西省自然科学基金资助项目(2014JM7272)
长安大学中央高校基本科研业务费专项资金资助项目(2013G3312018
2014G1311081)
道路与交通工程教育部重点实验室开放基金资助项目(K201402)~~
关键词
粗合成纤维
聚丙烯酰胺
纤维/基体界面性能
macro-synthetic fiber
polyacrylamide
fiber / matrix interfacial property
