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高硫尾矿配制成的膏体表现出不同程度的强度劣化,高硫膏体强度劣化能引起充填体质量的巨大变化.通过不同硫含量的膏体强度劣化实验,同时结合X射线衍射物相分析和环境扫描电镜分析,对高硫膏体的劣化规律和劣化机理进行了分析.得出含硫尾矿在一定程度上能促进膏体早期强度增长,却抑制了后期强度发育,硫含量越高,膏体后期强度劣化越显著.硫化物氧化生成的硫酸盐能促进膨胀性钙矾石和石膏类物质的生成.同时酸性环境造成了C-S-H的脱钙和CH的分解,已形成的胶凝体系遭到破坏,进一步促进了充填体的劣化.通过孔隙计算模型对晶体膨胀应变和裂纹发育过程进行了分析,阐述了膨胀性物质的线弹性应变发育机理.
Paste prepared from high-sulfur tailings showed different degrees of strength degradation, high-sulfur paste strength can cause a huge change in the quality of the filling body.Through different sulfur content of the paste strength degradation experiments, combined with X-ray diffraction phase Analysis and environmental scanning electron microscopy analysis of the degradation of high-sulfur paste and deterioration of the mechanism was concluded that sulfur-containing tailings to some extent, can promote the early strength of the paste growth, but inhibit the late strength development, the more the sulfur content High, the more obvious post-paste strength degradation.Sulfate oxidation of the sulfate can promote the formation of expansive ettringite and gypsum species.At the same time, acidic environment caused by CSH decalcification and decomposition of CH, the gel system has been formed Was destroyed, which further promoted the deterioration of the filling body.The pore expansion model and crack growth process were analyzed by pore calculation model, and the development mechanism of linear elastic strain of expansive material was expounded.