A Study on the Prediction of Adiabatic Temperature Rise in Binary Blended Concrete using Hydration Reaction Model

Granulated slag and fly ash, silica fume are among the industrial by-products and have been widely used as mineral admixture in high performance concrete and high strength concrete. Due to the reaction between calcium hydroxide and fly ash or slag, compared with Portland cement, the hydration of concrete containing fly ash or slag, silica fume is much more complex. In this paper, it is considered that hydration products, Ca(OH)2 is consumed with pozzolan reaction of mineral admixtures. A numerical model is proposed to simulate the hydration of concrete containing fly ash or slag, silica fume. The heat release rate of fly ash or slag, silica fume blended concrete is determined from the contribution of both cement hydration and reaction of mineral admixtures. Furthermore, a temperature rise in blended concrete is evaluated based on the degree of hydration of cement and mineral admixtures. The proposed model is verified with experimental data on the concrete with different water-to-binder ratios and mineral admixtures substitution ratios