高硫膏体强度劣化机理实验研究

发布时间：2018-03-28 05:37

本文选题：膏体充填　切入点：高硫尾砂　出处：《工程科学学报》2017年10期

【摘要】：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.
[Abstract]:The paste prepared with high sulfur tailings shows varying degrees of strength deterioration, and the strength deterioration of high sulfur paste can cause great changes in the quality of filling body. At the same time, combined with X-ray diffraction phase analysis and environmental scanning electron microscope analysis, the degradation law and degradation mechanism of high sulfur paste are analyzed. It is concluded that sulfur containing tailings can promote the early strength of paste to a certain extent. The higher the sulfur content is, the higher the sulfur content is. The later strength deterioration of paste is more obvious. Sulfate produced by sulfide oxidation can promote the formation of expansive ettringite and gypsum. At the same time, acid environment causes decalcification of C-S-H and decomposition of Ch, and the formed gelation system is destroyed. The process of crystal expansion strain and crack development was analyzed by pore calculation model, and the mechanism of linear elastic strain development of expansive material was expounded.
【作者单位】：北京科技大学土木与资源工程学院;
【基金】：国家自然科学基金资助项目(51574013,51374034,51674012)
【分类号】：TD853.34

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