混凝土表层改性纳米SiO_(2)复合涂层研究进展

Research progress of modified nano-SiO_(2) composite coating onconcrete surface

近年来,纳米SiO_(2)因具备活性高、稳定性好等特点被广泛应用提升混凝土性能方面的研究,通过硅烷类偶联剂改性后的纳米SiO_(2)可有效分散在涂层中以改善混凝土的耐久性。主要介绍了硅烷偶联剂对纳米SiO_(2)的改性机理,较为系统地探讨了改性纳米SiO_(2)复合涂层与混凝土水化性能、疏水性能、抗碳化性能和抗氯离子性能的影响关系,指出了现有研究存在的不足,指明了该方向的发展趋势。

In recent years,nano-SiO_(2) has been widely used to improve the performance of concrete due to its high activity and good stability.Nano-SiO_(2) modified by silane coupling agent can be effectively dispersed in polymer coating to enhance the durability of concrete.This paper mainly introduces the modification mechanism of nano-SiO_(2) by silane coupling agent,and systematically discusses the influence relationship between the modified nano-SiO_(2) composite coating and the hydration performance,hydrophobic performance,carbonization resistance and chloride ion resistance of concrete.Finally,the shortcomings of existing research are pointed out,and the development trend of this direction is indicated.