Effect of high temperature curing on hydration degree and micro-morphology of complex binders

The hydration degree and microstructure of complex binders during high temperature curing were studied by determining the non-evaporable water content and the reaction degree of fly ash, observing the micro-morphology and testing spectrum. The results show that heat activation obviously enhances the pozzolanic reaction of fly ash, which elevates the early hydration degree of complex binders remarkably. More hydration products are generated on the surface of fly ash particles, which makes the microstructure of pastes more denser than that cured at room temperature. However, high temperature curing has insignificant influence on the mass ration of CaO to SiO₂ of C-S-H gel in pastes and contributes little to the improvement of the later hydration degree and microstructure of complex binders.