An analysis of the deterioration mechanism of a grouting stone under the ion erosion
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摘要:
针对水泥-水玻璃注浆结石体（C-S结石体）在离子侵蚀环境下劣化机理研究较少之问题，通过无侧限抗压强度试验，分析了C-S结石体在3种不同浓度的硫酸盐、氯盐及二者混合液侵蚀后，不同龄期条件下的宏观力学性能变化规律；采用SEM、EDS和XRD相结合的方法观察C-S结石体细观结构及化学成分变化，揭示C-S结石体离子侵蚀损伤机理。研究结果表明：（1）侵蚀时间少于28 d时，离子溶液对C-S结石体强度增长并未产生明显影响；（2）侵蚀时间28 d到90 d时，高浓度离子溶液中C-S结石体劣化显著，
${\rm{ SO}}_4^{2-} $ ${\rm{ SO}}_4^{2-} $ ${\rm{ SO}}_4^{2-}$ ${\rm{ SO}}_4^{2-} $ ${\rm{Cl}}^- $ ${\rm{Cl}}^- $ Abstract:Research on the degradation mechanism of cement-water glass grouting stones (C-S stones) in an environment of ion erosion is lacking. The unconfined compressive strength test is conducted to analyze the change law of macro-mechanical properties of the C-S calculus body under different age conditions after the erosion of three different concentrations of sulfate. A combination of SEM, EDS and XRD is used to observe the mesostructure and chemical composition changes of the stone body, and reveal the mechanism of ion erosion damage of the grouting stone body. The results show that within 28 days of erosion, different concentrations of ionic solutions has no significant effect on the growth of stone strength. From 28 to 90 days of erosion, the growth of stone strength in high concentration solution is significantly degraded, and when the concentration of
${\rm{ SO}}_4^{2-} $ ${\rm{ SO}}_4^{2-} $ ${\rm{ SO}}_4^{2-} $ ${\rm{ SO}}_4^{2-} $ ${\rm{Cl}}^- $ ${\rm{Cl}}^- $ -
Key words:
- C-S stone /
- compressive strength /
- ion erosion /
- mesostructure /
- deterioration mechanism
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图 6 浓度20 g/L 时
${\bf{SO}}_{\boldsymbol{4}}^{{\boldsymbol{2}}-}$ 离子侵蚀条件下C-S结石体细观图像Figure 6.
图 8 浓度20 g/L时
${\bf{SO}}_{\boldsymbol{4}}^{{\boldsymbol{2}}-}$ &${\bf{Cl}}^{\boldsymbol{-}}$ 混合液侵蚀条件下C-S结石体细观图像Figure 8.
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