Abstract
Aluminum sulfate (AS), as the main composition of alkali-free accelerator, was widely used to accelerate the setting and promote the early strength in the sprayed concrete. In this study, effect of AS on the hydration reaction of C3A was investigated, which is one of the most important cement clinker minerals in the early age of cement hydration. The hydration reaction and products of C3A-AS system were characterized with hydration heat test, X-ray diffraction, thermogravimetric analysis, scanning electron microscope, and thermodynamic modeling. Results indicate that AS could hinder the hydration reaction in the very early age but then accelerate C3A hydration by producing SO4-AFm, OH-AFm, and gibbsite. The findings are expected to provide theoretical guidance for the product research and engineering application of alkali-free accelerator.
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