Deterioration Mechanism of New Grouting Materials Under Coupling Effect of Heat Damage and Sulfate Attack

Pengxu Li, J. Xia, Wenting Zhao
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Abstract

Aiming at the typical high temperature sulfate environment in underground engineering, the degradation mechanism of the new grouting material under the coupling action of heat damage and sulfate erosion was studied. Forty-four groups of specimens with different water-binder ratios were prepared. The changes of appearance, mass, compressive strength and sulfate ion content of the specimens under the action of different temperature (20°C, 30°C, 60°C, 90°C) and different sulfate concentration (0, 5%, 10%) were detected, the microstructure was observed by electron microscope (SEM), the content model of sulfate ion was established. The results show that: in the environment of sulfate erosion, high temperature has a significant effect on the deterioration of new grouting materials, the higher the temperature, the more obvious the deterioration. With the increase of water-binder ratio, the deterioration of new grouting materials becomes more and more serious. At the early stage of erosion, ettringite and other materials are gradually formed and continuously filled with pores and microcracks. At the later stage of erosion, the expansion stress of ettringite and the crystallization pressure of sulfate make the material gradually expand and destroy. The model of sulfate ion content established is in good agreement with the experimental results.
热损伤与硫酸盐侵蚀耦合作用下新型注浆材料劣化机理研究
针对地下工程中典型的高温硫酸盐环境,研究了热损伤与硫酸盐侵蚀耦合作用下新型注浆材料的降解机理。制备了44组不同水胶比的样品。检测了不同温度(20℃、30℃、60℃、90℃)和不同硫酸盐浓度(0、5%、10%)作用下试样的外观、质量、抗压强度和硫酸盐离子含量的变化,通过电镜(SEM)观察其微观结构,建立了硫酸盐离子含量模型。结果表明:在硫酸盐侵蚀环境下,高温对新型注浆材料的劣化有显著影响,温度越高,劣化越明显。随着水胶比的增大,新型注浆材料的劣化现象越来越严重。在侵蚀初期,钙矾石等物质逐渐形成,并不断充满孔隙和微裂纹。在侵蚀后期,钙矾石的膨胀应力和硫酸盐的结晶压力使物质逐渐膨胀破坏。所建立的硫酸盐离子含量模型与实验结果吻合较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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