纳米高岭土改性混凝土与钢筋的黏结性能  

Bonding behavior between steel bars and concrete modified with nano-kaolinite clay

作　　者：张世义[1] 范颖芳[1] 李宁宁[1] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,大连116026

出　　处：《东南大学学报（自然科学版）》2015年第2期382-386,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51178069);高等学校青年骨干教师基金资助项目(2011JC031);中央高校基本科研业务费专项资金资助项目(3132014073);辽宁省"百万人才工程"资助项目(2010921064);大连海事大学优秀博士培育基金资助项目(2014YB03)

摘　　要：为考察纳米高岭土对混凝土与钢筋间黏结性能的影响,利用电流加速腐蚀试验方法,研究了不同腐蚀时间下钢筋锈蚀率与纳米高岭土掺量的关系,分析了纳米高岭土改性混凝土与钢筋之间的黏结滑移关系及黏结强度的变化情况.研究结果表明:纳米高岭土改善了钢筋与混凝土间的黏结性能,降低了混凝土试件的刚度,纳米高岭土掺量为3%的混凝土试件与钢筋间的黏结强度较普通混凝土试件提高约56.55%;混凝土中内掺纳米高岭土能够延缓钢筋锈蚀,纳米高岭土掺量为5%的混凝土试件在腐蚀36 h后,钢筋锈蚀率较普通混凝土试件降低约52%;腐蚀48 h后,纳米高岭土掺量为3%的混凝土试件与钢筋间的黏结强度约为普通混凝土试件的2.16倍.To study the effect of nano-kaolinite on the bonding behavior of concrete and steel bars,the relationship betw een the corrosion ratio of steel bars and the nano-kaolinite content at different corrosion times are studied by the electrochemical accelerated corrosion method. And the bond-slip relationship and the change of the bond strength betw een concrete with nano-kaolinite and steel bars are analyzed. The results show that the addition of nano-kaolinite can improve the bonding behavior of concrete and steel bars and reduce the stiffness of concrete specimen. For the concrete specimen with nano-kaolinite content of 3%,the bonding strength of concrete and steel bars increases by about56. 55% compared with ordinary concrete specimen. Besides,the addition of nano-kaolinite can delay steel corrosion in concrete. After corrosion for 36 h,the corrosion ratio of steel bars in the concrete specimen with nano-kaolinite content of 5% decreases by about 52% than that of ordinary concrete specimen. After corrosion for 48 h in the concrete specimen with nano-kaolinite content of3%,the bonding strength betw een concrete and steel bars is about 2. 16 times that of ordinary concrete specimen.

关 键 词：纳米高岭土 黏结性能 黏结强度 锈蚀率 

分 类 号：TU502[建筑科学—建筑技术科学]