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为了研究碳酸根离子对富水充填材料的影响,通过强度检测、扫描电镜观察、X射线衍射分析和红外光谱测试,分析富水充填材料在碳酸钠溶液中浸泡后的宏观及微观结构变化,并对其腐蚀及劣化机理进行探讨.富水充填材料在质量分数为10%的碳酸钠溶液中浸泡后,抗压强度随浸泡时间延长大幅度降低,浸泡90 d后抗压强度比标养28 d抗压强度降低72.5%,浸泡28 d后出现泥化现象.X射线衍射图谱显示,富水充填材料在质量分数为10%的碳酸钠溶液中浸泡后有碳硫硅钙石生成,且随浸泡时间延长碳硫硅钙石的生成量增大.红外光谱结果未发现[Al O6]存在,证实在碳酸钠溶液中富水充填材料硬化体中钙矾石急剧减少,转变为烂泥状的碳硫硅钙石;碳硫硅钙石作为无胶结力物质,会对富水充填材料硬化体造成严重破坏,表明碳酸盐溶液对富水充填材料具有腐蚀作用.
In order to study the effect of carbonate ions on the water-rich filler material, the macroscopic and microstructure changes of the water-rich filler after soaking in sodium carbonate solution were analyzed by intensity detection, scanning electron microscopy, X-ray diffraction analysis and infrared spectroscopy The mechanism of corrosion and deterioration was discussed.When the water-rich filler was soaked in 10% sodium carbonate solution, the compressive strength of the water-filled filler decreased greatly with the soaking time, and the compressive strength of the water- Compressive strength decreased by 72.5%, soaking 28 days after the mud phenomenon X-ray diffraction pattern shows that the water-rich filling material in the mass fraction of 10% sodium carbonate solution after the formation of boehite, and with the soaking Prolonging the production of carbosulfite increased.FIR spectroscopy did not find the presence of [Al O6], confirming the rapid reduction of ettringite in a water-rich filler material in sodium carbonate solution into a slushy sulfosilithium Calcium carbonate; As a non-cementitious material, glauberite can cause serious damage to the hardened body of the water-rich filler material, indicating that the carbonate solution has a corrosive effect on the water-rich filler material.