工程科学学报2017，Vol.39Issue(10)：1493-1497,5.DOI:10.13374/j.issn2095-9389.2017.10.005;
高硫膏体强度劣化机理实验研究
Experimental study on the strength deterioration of sulfidic paste backfill
摘要
Abstract
Paste made from high-sulfur tailings shows strength deterioration to different degrees and this can cause great changes in the quality of the filling body. The deterioration and degradation mechanism of high-sulfur paste with different sulfur contents was analyzed using XRD (X-ray diffraction) phase analysis and an ESEM. The results showed that sulfur tailings promoted the growth of early strength to a certain extent, but inhibited the development of later strength, and the greater the sulfur content, the more obvious the effect. In addition, sulfate produced by sulfide oxidation can promote the formation of expansive ettringite and gypsum. Mean-while, the acidic environment caused decalcification of C- S- H and dissolution of CH, destroys the cementitious system and further promotes the degradation of the filling body. The crystal expansion strain and crack development process were analyzed using a pore calculation model. The linear development of elastic strain in swelling material was clarified.关键词
膏体充填/高硫尾砂/强度劣化/微观结构/硫铁矿Key words
paste backfill/sulfide tailings/strength degradation/microstructure/pyrite分类
矿业与冶金引用本文复制引用
程海勇,吴爱祥,王洪江,王贻明..高硫膏体强度劣化机理实验研究[J].工程科学学报,2017,39(10):1493-1497,5.基金项目
国家自然科学基金资助项目(51574013, 51374034, 51674012) （51574013, 51374034, 51674012）
