Study on strength characteristics of industrial solid waste combined with cement to stabilize saline soil under wet and frozen environment
The main environmental characteristics of saline soil areas are humidity and seasonal alternation.To study the strength characteristics of industrial solid waste cementing material stabilized soil in this environment,it simulated the actual environment through immersion,dry freezing,and wet freezing methods,and compared and analyzed the unconfined compressive strength and strength loss rate of slag-cement,coal gangue-cement,and fly ash-cement stabilizer stabilized saline soil.Meanwhile,XRD,FTIR,SEM and methods were used to reveal microscopic mechanism.The results show that immersion,dry freezing,and wet freezing environments have the least impact on the strength of slag-cement stabilized saline soil,followed by fly ash-cement stabilized saline soil,and coal gangue-cement stabilized saline soil has a stronger effect.The wet freezing environment has the greatest impact on solidified soil,followed by water immersion,and the dry freezing environment has the least impact.The wet freeze-thaw environment is the most unfavorable environment.It is recommended that the reasonable ratio of slag-cement stabilizer is 10％to 40％solid waste replacement rate,and the stabilizer dosage is 30％to 40％.The reasonable ratio of fly ash cement stabilizer and coal gangue cement stabilizer is that the solid waste replacement rate is≤10％,and the dosage of stabilizer is ≥ 40％.The chemical reaction between solid waste-cement stabilized saline soil includes cement self hardening,geopolymerization reaction,interaction between stabilizer and soil particles,and environmental interaction.The hydration products are mainly minerals such as C-S-H,C-A-S-H,C-N-A-S-H and AFt,which fill the pores,adhere to the surface of soil particles,and wrap around soil particles,thereby improving the overall strength of the soil.
wet and frozen environmentindustrial solid wastesaline soilstabilized soilstrength characteristicsmicroscopic mechanism
万方数据
维普
