Experimental Study and Hydration Mechanism Analysis of Geopolymer Multielement Net Slurry Self-Leveling Slurry Material

Abstract

In this project, cement-based composites reinforced with slag powder (abbreviated as SP), steel slag powder (abbreviated as SSP), and desulfurization gypsum (abbreviated as FGD) were used as the research objects, and the preparation, mechanical properties, and strengthening mechanism of the composites were systematically studied. A laser particle analyzer (Malvern Instruments Analysis) was used to determine that the particle sizes of the raw SSP, SP, and FGD materials were concentrated between 5 and 40 μm, indicating that they were fine-grained minerals. SSP and SP are highly active alkaline substances. With the two ratios of 6:3:1 (SP/SSP/FGD) and 7:2:1 (SP/SSP/FGD), the macroscopic mechanical properties and mechanism analysis results revealed that the alkali activator was incorporated into the composite material and that the compressive strength activation effects of the activators from strong to weak were as follows: Ca(OH)₂, Na2SiO₄, and NaOH. Microscopic scanning revealed that many AFt and C–S–H gels formed after hydration of the cementitious system. After water curing, efflorescence occurred on the surface of the test block, resulting in the formation of many pores inside the cementitious system.