酸碱环境下硅溶胶的长期耐久性研究

Study on long-term durability of silica sol under acid-base environment

为探究硅溶胶在酸碱环境中的适用性,使其能够在工程注浆领域更好地应用,开展了室内硅溶胶质量、体积、抗压强度、溶脱率试验,并利用所得试验数据分析了硅溶胶在酸碱环境中的耐久性。研究结果表明:在pH=3的酸性环境中,硅溶胶凝胶体的损失非常小,与在pH=7的蒸馏水中养护的凝胶体区别不明显,显示了硅溶胶在酸性环境中良好的稳定性;在pH=11的碱性环境中,凝胶体的损失比中性和酸性环境都大,说明硅溶胶在碱性环境中的稳定性稍差。

The quality,volume,compressive strength and dissolution rate tests of silica sol are carried out in laboratory,and the durability of silica sol in acid and alkali environment is analyzed by using the obtained test data in order to explore the applicability of silica sol in acid and alkali environment so that it can be better applied in the project grouting field.The results show that the loss of silica sol gel is very small,and the difference is not obvious from the gel cured in pH=7 distilled water in pH=3 acidic environment.It displays that the silica sol is stable in acidic environment.The loss of gel is larger than that of neutral and acidic environment in pH=11 alkaline environment.It indicates that the stability of silica sol is worse in alkaline environment.