不同类型纳米粒子改性涂层对混凝土疏水和抗冻性能的影响

关键字：不,同类型,纳米,粒子,改性,涂层,对,混凝土,

（河南工业大学 土木建筑学院，河南 郑州  450001）

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。 

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

中图分类号：TU56+1.65        文献标识码：A        文章编号：1001-702X（2019）08-0154-05

 

Influence of different types of nano-modified coatings on hydrophobic and frost resistance of concrete

DING Yonggang，SUN Lei，LI Xuesen，WANG Junwei

（College of Civil Engineering and Architecture，Henan University of Technology，Zhengzhou 450001，China）

Abstract：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. 

Key words：concrete，nano-modified film-forming coating，contact angle，hydrophobic property，frost resistance