Abstract
The effects of simulated groundwater with different concentrations of sodium sulfate (0 g/L, 5 g/L, 15 g/L, and 25 g/L) as mixed water on the early performance of alkali-free accelerator-cement-mineral admixture system were investigated. The results show that sulfate groundwater promotes the setting time and strength of the alkali-free accelerator-cement-mineral admixture system. Combined with isothermal calorimeter, X-ray diffraction, and scanning electron microscopy, the hydration process and hydration products of sulfate-containing groundwater were analyzed. In addition, the hydration degree of each hydration stage was calculated by hydration heat curve, and the hydration mechanism of different concentrations of sulfur-containing groundwater on cement pastes mixed with AS (alkali-free accelerator) was proposed by microscopic analysis.
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