Abstract
The purpose of this study was to evaluate the effects of sintering temperature and sintering time on mineral composition of high-alite white Portland cement clinker and hydration activity of the clinker. Effects of sintering temperature and sintering time on clinker mineral composition, C3S polymorph and size and hydration heat release rate were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), differential scanning calorimetry&Thermogravimetric Analysis (DSC-TG) and isothermal heat-conduction calorimetry. Results shown that, with the increase of sintering temperature (1450–1525 °C) and sintering time (60–240 min), free lime (f-CaO) in clinker decreased, C3S grain size increased, and C3S crystal type changed from T3 to M type and R type, which exhibits higher symmetry. The hydration activity of different C3S crystals ranged from high to low as follows: T3→M1→M3→R@.
Highlights
Cement-based materials have a lot of advantages such as performance stability, safety and durability, construction convenience and are in general considered environmentally friendly
C3 S is the main component of clinker, and its hydration product is the main source of cement’s strength, which determines the key performance of cement clinker
In order to study the effects of sintering temperature on a cement clinker, prepared samples were firstly preheated for 30 min in a 500 ◦ C electric muffle furnace, rapidly transferred to a 1450 ◦ C, 1475 ◦ C, 1500 ◦ C and 1525 ◦ C silicon–molybdenum resistance furnace and subjected to sintering for 120 min, cooled with deionized water to room temperature immediately after removal from the furnace
Summary
Cement-based materials have a lot of advantages such as performance stability, safety and durability, construction convenience and are in general considered environmentally friendly. Portland cement is the main raw material of cement-based materials, which have only three main phases: C3 S, C2 S, and C3 A, as compared to ordinary Portland cement. C3 S is the main component of clinker, and its hydration product is the main source of cement’s strength, which determines the key performance of cement clinker.
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