Anti-crack performance of phosphorus slag concrete |
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Authors: | Xia Chen Li Zeng Kunhe Fang |
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Institution: | (1) States Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, Hubei, China |
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Abstract: | Anti-crack performance of concrete with phosphorus slag and fly ash singly and compositely added is investigated in terms
of physical performance, hydration heat, dry shrinkage and creep, and index K is introduced to evaluate the crack resistance of phosphorus slag concrete. Results show that strength of phosphorus slag
concrete increases with fineness increasing and when surface specific area is greater than 300 m2/kg the tendency slows down. Strength decreases with phosphorus slag content increasing and there is an optimal content existing
between 30% and 50%. Both phosphorus slag and fly ash have obvious effect on elongating time setting, reducing hydration heat
to a large extent and increasing creep value. Crack resistance of phosphorus slag concrete is divided into three stages, namely
early hazardous stage, growth stage and later mature stage. With microstructure analysis, mechanism of effect of phosphorus
slag on concrete performances and P and F on cement hydration is explored. It is concluded after comprehensive evaluation
that the crack resistance of phosphorus slag concrete is approximate to, even to some extent better than that of fly ash concrete.
Foundation item: Supported by the Guizhou Goupitan Hydro-Power Plant Project |
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Keywords: | phosphorus slag creep anti-crack performance mechanism |
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