Experimental Research on the Impact of Water-cement Ratio and Admixture on Hydration Heat of Cementitious Material at Constant Low Temperature of 3°C

Abstract

This paper, to investigate the impact of water-cement ratio and admixtures on the hydration heat of cementitious material at constant low temperature of 3°C, measured the hydration heat values of cementitious material with various water-cement ratios and admixtures in 28d with the direct approach described in Test Methods for Heat of Hydration of Cement (GB/T 12959-2008). The results show that at constant low temperature of 3°C, the hydration heat of cementitious material rises with the increase of water-cement ratio. However, as the water-cement ratio is fixed, the hydration heat of the cementitious material decreases with the adding of fly ash and mineral powder, but there is no proportional relationship between the two. After comparing the hydration heat of cementitious material of different blending materials and amounts with the cementitious material without any admixture, it was found that at the initial stage, the admixture adding would significantly affect the hydration heat while latter the impact decreased greatly. At the 28d, the difference in hydration heat is generally within 10%.