Study on properties and mechanism of alkali-activated geopolymer cementitious materials of marble waste powder

Abstract

In order to explore the effect and mechanism of marble waste powder on the properties of alkali-activated slag composite cementitious materials. The effects of different parameters on the properties of alkali-activated slag composite cementitious materials were studied by taking the particle size, content of marble waste powder and alkali liquid modulus as the change parameters. The results show that marble powder (SW) can effectively improve the fluidity of the slurry, and the larger the particle size, the more obvious the fluidity of the slurry. The alkali liquid modulus has a significant effect on the compressive strength of cementitious materials, and low alkali liquid modulus is beneficial to improve the compressive strength of cementitious materials. Alkali-activated marble powder cementitious material found Ca6(Si2O7)(OH)6 and Ca(OH)2, and Si–O bond vibration characteristic peak vibration peak in geopolymer unit. Based on the experimental results, the mechanism and reaction process of marble powder were established.

Keywords

• Marble waste powder
• Alkali-activated
• Slag
• Metakaolin
• Mechanism of action
• Reaction process