摘要
北方地区冬季除冰盐的使用严重影响桥面铺装混凝土的耐久性。因此将硫铝酸盐快硬水泥(SAC)、聚合物改性快硬水泥(JS)和普通硅酸盐水泥(P.O)三种混凝土置于质量浓度为0%和3.5%的NaCl溶液中进行快速冻融循环试验,分析不同条件下混凝土的冻融损伤发展规律,并结合扫描电镜观察,对不同混凝土在水冻和盐冻环境下的内部损伤机理进行分析。试验表明:(1)相比于盐冻,水冻下混凝土并未发生明显质量变化,冻融破坏速度缓慢且程度低;(2)两种环境下混凝土抗冻性能均为P.O>JS>SAC;(3)盐冻环境下会产生更多的腐蚀产物Friedel盐,从而加剧混凝土的表面溃散。
The use of deicing salt in the winter of northern China can seriously affect the durability of concrete for bridge deck overlays.In order to solve this problem,the law of freezing-thawing damage development under different situation has been studied.Rapid hardening sulphoaluminate cement(SAC),polymer-modified fast-hardening cement(JS)and ordinary Portland cement(P.O)were placed in NaCl solution with mass concentration of 0%and 3.5%to conduct fast freeze-thaw cycles experiment.Besides,with the help of SEM,the internal damage mechanism of different kinds of concrete under water and salt freezing environment were analyzed.Results showed that compared with the concrete in salt freezing situation,the sample in water freezing si-tuation did not show apparent mass loss,which meant that the freezing-thawing damage rate was slow and the damage was in a low degree.The antifreeze characteristic sequence of concrete both in two situations is P.O>JS>SAC.In salt freezing situation,more Fridel salt was yielded as corrosion products,which aggravated the collapsing of concrete.
作者
南雪丽
王超杰
刘金欣
韩博
杨蓝蓝
NAN Xueli;WANG Chaojie;LIU Jinxin;HAN Bo;YANG Lanlan(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology, Lanzhou 730050;School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2017年第23期177-181,共5页
Materials Reports
基金
甘肃省科技计划资助(1508RJZA107)
关键词
聚合物
硫铝酸盐水泥
冻融循环
抗冻性
polymer
sulphoaluminate cement
freeze-thaw cycles
frost resistance
作者简介
南雪丽:女,1977年生,博士,副教授,主要从事道路材料的研究,E-mail:490985302@qq.com。
