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Effect of synthetic hydrated calcium aluminate additive on hydration properties of OPC

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Document pages: 8 pages

Abstract: The effects of CaO (SiO2 + Al2O3) = 0.55; Al2O3 (SiO2 + Al2O3) = 0.1,0.15) with different crystallinity on the early hydration kinetics of OPC were studied. In addition, the formation mechanism of compounds during OPC hydration was also emphasized. The results showed that the synthesized CAH accelerated the initial reaction and shortened the induction period. In addition, compared with pure OPC samples, the second and third exothermic reactions began earlier, and higher heat flow values were obtained during the latter reaction. In the later stage of hydration, the synthesized CAH affects the hydration of OPC like ordinary pozzolanic additives; In addition, the value of accumulated heat is also greater. It should be noted that the properties of synthetic CAHsamples accelerated the dissolution of gypsum and stimulates the earliest C3S hydration.

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