Abstract: As a by-product of industrial production, the annual production of stone powder is much greater than the consumption, and too much stone powder can cause serious environmental problems. The mortar with a large amount of stone powder can improve the utilization rate of stone powder, but the corresponding strength decreases. The addition of single early strength agent in mortar has a limited increase in early strength. In this work, the effects of three kinds of composite early strength agents DEIPA-Na2SO4, DEIPA-Al2(SO4)3, DEIPA-Al2(SO4)3)-Na2SO4 on strength and hydration of mortar with limestone powder were studied. The results by hydration heat, X-ray diffraction, differential thermogravimetric analysis, mercury intrusion porosimetry and scanning electron show that these three composite early strength agents can increase the hydration temperature, promote the formation of early hydration products, reduce porosity, and greatly improve the early compressive strength of mortar with limestone powder, but DEIPA-Na2SO4 and DEIPA-Al2(SO4)3-Na2SO4 have a negative impact on the long time strength, while DEIPA-Al2(SO4)3 still has a promoting effect.
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2025, Vol. 39 
