固硫灰渣–水泥基泡沫轻质土性能与机理

Performance and Mechanism of Sulfur-Fixing Ash-Cement Based Foam Lightweight Soil

采用固硫灰渣替代水泥制作泡沫轻质土,可有效降低成本。通过比选不同的活性激发方式对固硫灰渣活性的影响,进一步提高了固硫灰渣在泡沫轻质土中的掺量。采用化学激发的方式最有效,DEIPA激发剂的最佳掺量为0.04%,与未改性前相比提高了26%。过筛处理对材料的强度和流值没有明确区别。机械磨细虽然能提高材料的早期强度,但是过细的粒径会导致材料消泡。因此推荐采用化学激发的方式提高固硫灰渣的掺量。分析了固硫灰渣基泡沫轻质土材料的吸水率、密度、强度、软化系数等,给出推荐固硫灰渣掺量为280 kg/m3。随着养护龄期的增加,材料的吸水率逐渐降低,密度相对稳定。强度随着水泥掺量的增加而增加,在干燥环境下,强度无明显变化。软化系数均大于0.85,水稳系数较高。Using desulfurized slag to replace cement in the production of foamed lightweight soil can effectively reduce costs. By comparing different methods of activating the activity of desulfurized slag, the amount of desulfurized slag added to the foamed lightweight soil was further increased. The chemical activation method is the most effective, with the optimal dosage of DEIPA activator being 0.04%, an increase of 26% compared to before modification. Screening treatment does not have a clear difference in the strength and flow value of the material. Although mechanical grinding can improve the early strength of the material, overly fine particle size will cause the material to deflate. Therefore, chemical activation is recommended to increase the amount of desulfurized slag added. The water absorption rate, density, strength, and softening coefficient of the desulfurized slag-based foamed lightweight soil material were analyzed, and it is recommended that the desulfurized slag content be 280 kg/m3. As the curing age increases, the water absorption rate of the material gradually decreases, while the density remains relatively stable. The strength increases with the increase in cement content, and there is no significant change in strength under dry conditions. The softening coefficient is all greater than 0.85, and the water stability coefficient is high.