Ultrasonic characterization of model mixtures of hydrated aluminous cement

In an aluminous cement, which mainly consists of CA, the stable phases arising during hydration are C3AH6 and AH3. This communication presents a chemical route for the synthesis of C3AH6 which is based on hydration of C3A. Mixtures of CA, C3AH6 and AH3 are characterised by ultrasonic testing. The ultrasonic velocity obtained on these mixtures is lower than what is observed in hydrated aluminous cement of similar chemical composition. Interfaces are thought to play a significant role in the ultrasonic response of aluminous cements.