复合水泥土无侧限抗压强度正交试验研究

摘要

Flue-gas desulfurization gypsum and fly ash can be blended into a new cementitious material with chemi-cal activity.According to its application in the engineering,contents of flue-gas desulfurization gypsum,fly ash and cement were taken as variable parameters in the experiment.The effects of the three factors on compressive strength of cement-soil with different curing ages were explored through orthogonal experiment.Meanwhile,differences among these factors were analyzed.The results show that,cement blending ratio has the maximum impact on the unconfined compressive strength of cement-soil,whereas flue-gas desulfurization gypsum and fly ash have almost no effect on the unconfined compressive strength of cement-soil in the age of 3 days,and a little impact at late stage.Moreover,the influence of flue-gas desulfurization gypsum is more significant than that of fly ash within 28 days,but after that,the impact of fly ash is more significant than that of flue-gas desulfurization gypsum.%脱硫石膏与粉煤灰混合后可复合成一种新型活性胶凝材料，针对其在工程中的运用情况，采用正交试验法研究了不同养护龄期下水泥掺量、脱硫石膏及粉煤灰对水泥土抗压强度的影响，分析了各因素水平之间的差异。研究结果表明：水泥掺量对水泥土无侧限抗压强度影响最大，脱硫石膏与粉煤灰在3 d 时对水泥土的无侧限抗压强度基本无影响，后期随着龄期的增大对其有一定影响；同时脱硫石膏在28 d 前对水泥土的无侧限抗压强度影响比粉煤灰稍显著，28 d 后粉煤灰的影响则稍显著。