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6360832 
Journal Article 
Mechanism and kinetics of hydration of C3A and C4AF. Extracted from cement 
Plowman, C; Cabrera, JG 
1984 
Yes 
Cement and Concrete Research
ISSN: 0008-8846 
14 
2 
238-248 
The early hydration of C3A + C4AF extracted from cement and mixes with quartz, gypsum and pulverised fuel ash (PFA) has been studied by x-ray diffraction. The investigation has shown that the hydration of both aluminates is essentially a mechanism which obeys a modified diffusion equation. The values obtained for the reaction rates show that the hydration of C3A takes place at seven times the rate of hydration of C4AF. PFA was shown to be a very effective retarder. A mechanism to explain retardation is also proposed.