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Effect of phosphorus slag on steam cured concrete

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Document pages: 14 pages

Abstract: Steam curing is an effective method to improve the hydration degree of phosphorus slag binder. By measuring the hydration heat, hydration products, nonvolatile water content, paste pore structure, compressive strength and chloride ion permeability of steam cured concrete, the role of phosphorus slag in steam cured concrete was studied. The results show that increasing the steam curing temperature will not lead to new crystalline hydration products of phosphorus containing slag composite binder. Increasing steam curing temperature can improve the early hydration heat and nonvolatile water content of phosphorus containing slag binder, and make the later hydration degree higher and pore structure finer than increasing steam curing time. in order toeam-cured concrete containing phosphorus slag, elevating curing temperature from 60°C to 80°C tends to decrease the late-age strength and increase the chloride permeability. However, at constant curing temperature of 60°C, the steam-cured concrete containing phosphorus slag can achieve satisfied demoulding strength and late-age strength and chloride permeability by extending the steam curing duration.

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