Abstract:

Flue-gas desulfurization gypsum and fly ash can be blended into a new cementitious material with chemical 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.

Key words: composite cement-soil, flue-gas desulfurization gypsum, fly ash, orthogonal experiment, unconfined compressive strength, curing period