Tricalcium aluminate during hydration...
Tricalcium aluminate reacts with Gypsum in presence of water any form calcium aluminate trisulphate hydrate which is known as entringite, which is unstable product which reacts with C3A in the absence of gypsum and create Calcium aluminate monosulphate hydrate crystal which is stable only in absence of sulphate but in the presence of sulphate mono sulphate crystal again convert in trisulphate hydrate crystal which size is more than two or 2.5 times of monosulphate crystal due to these large size crystal crack are developed in concrete and cement known as sulphate attack.
No comments:
Post a Comment