Abstract：In order to improve the comprehensive utilization of limestone powder, this paper investigates the changes in the working properties, compressive strength, pore structure and hydration products of fly ash concrete by changing the admixture and fineness of limestone powder. The results show that compared with the test group without limestone powder, the 10% admixture of limestone powder can improve the slump and expansion of concrete, improve the pore structure of hardened paste, and increase the 7 d and 28 d strength by 9.5% and 6.0%. Finer limestone powder can promote the hydration reaction process of concrete and increase the compressive strength of concrete, but the specific surface area of 650 m2/kg will have an adverse effect on working performance of concrete.
2025, Vol. 0 
