Study on properties of alkali slag limestone powder cement mortar based on the central composite design method

This paper aims to investigate the central composite design used to study the performance of alkali-activated slag-limestone powder cement mortar and optimize the mix proportion parameters. The results show that the alkali content significantly influences the fluidity, flexural strength and compressive strength of mortar. The interaction of alkali content and limestone powder significantly affects the 28-day compressive strength and water absorption. The established models of fluidity, strength and water absorption are accurate and effective, and the errors are less than 5%. The optimization results demonstrated that 7.55% alkali and 10% limestone powder incorporated in alkali-activated slag mortar has the highest desirability.