摘要
选择纳米SiO2、TiO2和CaCO3改性环氧树脂(ER)、氯化橡胶(CR)、醇酸磁漆(AR)3种涂料,通过接触角测试确定纳米粒子的最佳掺量,并对最佳掺量下的纳米改性涂层进行吸水率、抗冻性能测试。结果表明:纳米SiO2的疏水性效果更好,相较于单独使用未改性的ER、CR和AR涂料的混凝土,平均吸水率降幅为43.2%。有机成膜涂料+纳米SiO2粒子复合涂层对混凝土抗冻性能改善效果更明显,在最优纳米SiO2掺量下,100次冻融循环后平均相对动弹性模量为82.5%,吸水率与相对动弹模量之间存在负相关关系,表现为吸水率越小抗冻性能越好。
Three different types of nano-particles including nano-SiO2,TiO2 and CaCO3,and three organic film-forming coatings including ER,CR and AR were selected. The optimal content of nano-particles was determined by contact angle test. The water absorption and frost resistance of the nano-modified coating with the optimal content were tested. It was showed that nano-SiO2 had the best hydrophobic improvement effect among nano-SiO2,TiO2 and CaCO3. Compared with concrete using ER,CR and AR coatings alone,the average water absorption rate decreases by 43.2%. The organic film-forming coating plus nano-SiO2 particle composite coating had the most obvious improvement effect on the frost resistance of concrete. Under the optimal nano-SiO2 content,the average relative dynamic elastic modulus is 82.5% after 100 freeze-thaw cycles. It was also found that there was a negative correlation between the water absorption rate and the relative dynamic modulus, and the concrete manifestation was that the stronger the hydrophobic property,the better the frost resistance.
作者
丁永刚
孙蕾
李学森
王俊伟
DING Yonggang;SUN Lei;LI Xuesen;WANG Junwei(College of Civil Engineering and Architecture,Henan University of Technology,Zhengzhou 450001,China)
出处
《新型建筑材料》
北大核心
2019年第8期154-158,共5页
New Building Materials
基金
国家重点研发计划项目（2016YFD0401601）
河南省粮油仓储建筑与安全重点实验室开放课题（2016KF-A01)
关键词
混凝土
纳米改性成膜涂层
接触角
疏水性能
抗冻性能
concrete
nano-modified film-forming coating
contact angle
hydrophobic property
frost resistance
