PDF(Pubmed)
Abstract：
Steel slag is an industrial solid waste, which can provide a new calcium source for microbial mineralization as it contains abundant calcium elements. This study treated cemented backfill material with microorganisms and steel slag to enhance its performance. The influence of microbial treatment on the strength, microstructure, and pore characteristics of the backfill was assessed using a strength test, nuclear magnetic resonance, scanning electron microscopy, and X-ray diffraction. The results indicate that (1) the microbial mineralization and the hydration reaction take place at the same time; (2) when the proportion of bacterial solution exceeded 50%, microorganisms excessively consumed Ca2+, which hindered the following hydration reaction; (3) the additional amount of bacterial solution added into the steel-slag-based cemented backfill material should be less than 50%, which increases the strength by up to 22.10%; (4) the excessive bacterial solution sharply reduces the strength of the backfill even by 21.41%; and (5) the addition of bacterial solution affects the pore characteristics. A 50% bacterial solution can make backfill reach its lowest porosity. The strength has an inversely proportional relationship with porosity, diameter, and roundness (σ = ax + b, a < 0).
摘要：
钢渣是一种工业固体废弃物,它含有丰富的钙元素，为微生物矿化提供了新的钙源。本研究用微生物和钢渣处理胶结回填材料以提高其性能。微生物处理对强度的影响，微观结构，回填的孔隙特征是使用强度测试评估的，核磁共振,扫描电子显微镜，和X射线衍射。结果表明:(1)微生物矿化和水化反应同时发生;(2)当细菌溶液的比例超过50%时,微生物过度消耗Ca2+，阻碍了后续的水化反应；（3）钢渣基胶结回填材料中细菌溶液的添加量应小于50%，其强度增加高达22.10%;(4)过量的细菌溶液急剧降低回填的强度甚至21.41%;(5)细菌溶液的添加影响孔隙特性。50%的细菌溶液可以使回填达到其最低孔隙率。强度与孔隙率成反比关系，直径,和圆度(σ=ax+b，a<0)。
