Abstract
This paper aims to evaluate the influence of three kinds of sulfates from the green production of cement on its sintering and hydration. The properties of clinker and hydration were monitored by thermogravimetric and differential thermal analysis (TG–DTA), X-ray diffraction, X-ray fluorescence and isothermal conduction calorimeter. Results indicate that gypsum lowers the decomposition temperature of CaCO3 and all these Sulfates will enhance the solid-phase reaction but increase melting temperature. Sulfates reduce the content of C3S, but K2SO4 and 2CaSO4·K2SO4 is conducive to the formation of β-C2S. The hydration induction period is shortened by the sulfates. K2SO4 and 2CaSO4·K2SO4 improve the early hydration of clinker, but gypsum may lightly reduce the hydration reactivity of clinker in acceleration period. 2CaSO4·K2SO and K2SO can significantly accelerate the compressive strength development of cement clinker before 3 d; by contrast, gypsum is detrimental for that. The precipitation of hydration products (CH and C–S–H) in clinker with sulfates is more than that of clinker without sulfates at 9 h. K2SO4 can accelerate the hydration of clinker without forming ettringite.
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