关键词: 水泥-水玻璃, 防渗灌浆材料, 水封洞库, 国家石油储备, 耐久性

Abstract: In the aim of supporting the engineering application of grouting material in underground water-sealed cavern at Zhanjiang national petroleum storage project, we conducted tests on the sulfate corrosion resistance, freezing thawing resistance and drying shrinkage of grouting material composed of cement and water glass(sodium silicate)in line with current test standards. The cement-sodium silicate grouting material used in the tests were designed at different mix proportions. A large number of sample results showed that after corrosion resistance test, the loss rate of cement-sodium silicate grouting material's rupture strength was higher than -50%; after freezing thawing test, the loss rate of compressive strength at optimum mix ratio was less than 25%, and the mass loss rate was less than 3%; the drying shrinkage rate of grouting material with optimized mix ratio at the 56^th day was less than 7%. In addition, the quality control requirements for cement-sodium silicate grouting material were discussed by analyzing the fluctuation of durability under different parameters.

Key words: cement-water glass, grouting material, water-sealed cavern, national petroleum storage, durability