The Effect of Different Admixture on the Properties of Refractory Concrete with Portland Cement

Abstract

The effect of admixtures, such as disperse chamotte, microsilica, low – density liquid glass and alumina cement (Gorkal 40) on Portland cement hydration by measuring the temperature due to exothermic reaction is investigated. The admixtures differently affect Portland cement hydration: microsilica and alumina cement accelerate, while low density (1025 – 1050 kg/m3) liquid glass retards Portland cement hydration. When the density of the liquid glass reaches 1100 kg/m3, it accelerates the Portland cement hydration as well. Thermal shock resistance of refractory concrete with Portland cement, chamotte aggregates and various admixtures is studied. It was found that a complex admixture of disperse chamotte, microsilica and low – density liquid glass allows the thermal shock resistance of concrete to be increased, thereby indirectly demonstrating the capability of these admixtures to effectively bind CaO.