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为满足实验室研究水泥基材料的碳硫硅钙石型硫酸盐侵蚀(thaumasite form of sulfate attack,TSA)破坏的需要,研究了一种快速生成碳硫硅钙石的途径。将内掺10%硫酸镁的水泥-石灰石粉净浆样品浸泡在(5±2)℃水中,进行硫酸盐侵蚀加速试验,观察侵蚀后样品外观,并用X射线衍射、红外光谱分析腐蚀产物。结果表明:浸泡6个月后,样品失去强度,变为一种白色、柔软且无黏结力的烂泥状物质,腐蚀产物以碳硫硅钙石、石膏为主,并含有少量钙矾石,具有典型的TSA破坏特征。与硫酸盐溶液外部侵蚀相比,内掺法显著加速水泥基材料TSA破坏。X射线衍射结合红外光谱分析可以有效鉴定碳硫硅钙石存在。
In order to meet the need of laboratory research on the damage of the thaumasite form of sulfate attack (TSA) in cement-based materials, a rapid way to generate the carbosulfite has been studied. The cement-limestone powder with 10% magnesium sulfate was immersed in (5 ± 2) ℃ water to accelerate the sulfate attack. The appearance of the sample after erosion was observed. The corrosion products were analyzed by X-ray diffraction and infrared spectroscopy. The results showed that after six months’ immersion, the sample loses its strength and becomes a white, soft and non-sticky sludge material. The corrosion products mainly consist of glauberite and gypsum and contain a small amount of ettringite. Typical TSA damage characteristics. Compared with the external erosion of sulfate solution, the internal mixing method significantly accelerated the destruction of TSA in cement-based materials. X-ray diffraction combined with infrared spectroscopy can effectively identify the existence of boehmite.