Investigation of early hydration of high aluminate cement-based binder at different ambient temperatures

Abstract

Abstract The effect of spent FCC catalyst on early hydration (up to 48 h) of high aluminate cement (Al2O3 >70%) at different ambient temperatures (10, 20, and 30 °C) was investigated. Cement pastes with constant ratio of water/binder = 0.35 (binder = cement + addition) and containing 0, 5, 10, and 15% mass of addition as replacement of cement were studied. The hydration kinetics was determined by calorimetric measurements and the structure of hardened binders after 2 days of curing at an appropriate temperature was also investigated using X-ray, SEM, and thermal analysis methods. Due to the fact that hydration of aluminate cements is highly sensitive to temperature conditions as well as certain changes of temperature are inevitable in practice, the evaluation of the impact of the waste catalyst addition in such conditions is justified. On the basis of obtained results, it was stated that the temperature determines the early hydration of high aluminate cement and decides about the influence of waste alumin...