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Abstract In order to achieve the required strength of the assembled PC component within a specific time frame without steam curing, this study investigates the impacts of mixture and calcium formate content on the physical and mechanical properties of cement based on early strength and early setting silicate clinker. Consequently, a kind of early strength cement is developed and successfully applied in the production of assembled PC components. The early hydration heat and hydration products of early strength cement and commercial P·O 42.5R cement are compared using isothermal calorimetry, X-ray diffraction (XRD), and synchronous thermal analysis (TG-DTG). The results show that when the grinding ratio of early strength cement is 80% clinker, 5% mixed gypsum, 7.5% limestone, 7.5% high titanium slag and 2‰ calcium formate, the hydration rate of early strength cement surpasses that of P·O42.5R cement during the initial stages, and it has higher abundance of hydration products, which enhances the compactness of the cement matrix and leads to a corresponding improvement in its strength. The early strength cement significantly enhances the 12-hour compressive strength of concrete during low temperature curing. When cured at temperature of 20 to 30 ℃, the concrete formulated with early strength cement can meet the demolding requirements after a 12-hour curing period, thereby enabling energy-efficient and productive production of prefabricated PC components.
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Published: 29 August 2024
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2024, Vol. 0 
