In this work, the effect of mineral admixture type and dosage on the rheological and mechanical behaviors of a newly developed backfilling material, cemented foam backfill (CFB), is comprehensively investigated. Fly ash (FA), ground granulated blast-furnace slag (GGBS) and quicklime are selected as mineral admixtures, while H₂O₂ and CaCO₃ whisker are used as foaming agent and foaming stabilizer respectively. CFB samples are prepared with solid content between 70% and 76%, replacement rates of cement with FA or GGBS between 0% and 30% and cured at 7, 14 and 28 days. In addition, 5 wt % of FA or GGBS is replaced by an equal amount of quicklime to accelerate pozzolanic reaction in a portion of CFB samples. Then, fresh CFB is subjected to the rheological property (i.e., apparent viscosity and equivalent Bingham yield stress) test, while hardened CFB is subjected to porosity and mechanical tests. Additionally, thermogravimetric and X-ray diffractogram analyses are conducted on 7- and 28-day hydrated binder pastes (pure cement, cement + FA/GGBS, cement + FA/GGBS + quicklime) to reveal the influence of mineral admixture type and dosage on the hydration product of CFB.

在这项工作中，全面研究了矿物掺合料的类型和用量对新开发的回填材料（胶结泡沫回填）的流变和力学行为的影响。选择粉煤灰（FA），磨碎的高炉矿渣（GGBS）和生石灰作为矿物掺合料，而H ₂ O ₂和CaCO ₃晶须分别用作发泡剂和发泡稳定剂。CFB样品的固含量为70％至76％，FA或GGBS替代水泥的比例为0％至30％，并在7、14和28天固化。此外，用等量的生石灰代替5 wt％的FA或GGBS，以加速部分CFB样品中的火山灰反应。然后，对新鲜的CFB进行流变性能（即表观粘度和等效的宾厄姆屈服应力）测试，而对硬化的CFB进行孔隙率和机械测试。此外，还对7天和28天的水合粘结剂糊料（纯水泥，水泥+ FA / GGBS，水泥+ FA / GGBS +生石灰）进行了热重分析和X射线衍射分析，以揭示矿物掺合料类型和用量对混合料的影响。 CFB的水合产物。