水泥-石灰-粉煤灰稳定废弃花岗岩石粉力学性能研究

Study on the Mechanical Properties of Cement Lime Fly Ash Stabilized Waste Granite Powder

为研究花岗岩石粉资源化利用的可行性,采用水泥、石灰和粉煤灰对花岗岩石粉进行改良处理,通过击实试验、无侧限抗压强度试验、pH值检测分析不同掺量、不同固化剂对改性花岗岩石粉力学性能的影响。得到:改性花岗岩石粉的最佳含水率降低,最大干密度升高,同为掺量为3%时,水泥改性花岗岩石粉的最佳含水率相较石灰改性花岗岩石粉降低,最大干密度却增加;浸水条件下的改性花岗岩石粉的无侧限抗压强度要低于未浸水的。水泥(石灰)改性花岗岩石粉的无侧限抗压强度随水泥(石灰)掺量的增加呈上升(下降)趋势,粉煤灰掺量改变对粉煤灰改性花岗岩石粉的无侧限抗压强度的影响近乎于0;改性花岗岩石粉的pH值要高于花岗岩石粉。

In order to study the feasibility of resource utilization of granite stone powder,cement,lime and fly ash were used to improve the treatment of granite stone powder,and the effects of different admixtures and curing agents on the mechanical properties of modified granite stone powder were analyzed by compaction test,unconfined compressive strength test and pH value test.There were obtained:(1)The best moisture content of modified granite stone powder is lower than that of granite stone powder,the maximum dry density is higher than that of granite stone powder,the best moisture content of cement modified granite stone powder is lower than that of lime modified granite stone powder when the same dosage is 3%,but the maximum dry density is increased.(2)The unconfined compressive strength of modified granite powder under water immersion condition is lower than that of non-immersion modified granite powder,the unconfined compressive strength of cement(lime)modified granite powder shows an increasing(decreasing)trend with the increase of cement(lime)admixture,and the effect of the change of fly ash admixture on the unconfined compressive strength of fly ash modified granite powder is close to 0.(3)The pH of the modified granite rock powder should be higher than that of the granite rock powder.