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Effect of steam curing method on performance of concrete with large amount of mineral admixture

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Document pages: 11 pages

Abstract: By analyzing the demoulding strength, chemical bound water content and chemical bound water content, the effects of increasing the constant temperature and prolonging the constant temperature time on the performance, reaction degree, strength development, chloride permeability and volume stability of steam cured concrete containing a large amount of fly ash (FA) or ground blast furnace slag (GGBS) are compared. For the materials and test conditions reported in this study, increasing the constant temperature is more conducive to the concrete containing FA than prolonging the constant temperature time, which can be seen from the significantly higher demoulding strength and the increase of FA reaction degree. With the increase of constant temperature, the degree of hydration is a binder containing FA or GGBS initially increases and subsequently decreases. Although concrete containing FA can obtain satisfactory form removal strength with steam curing at 80°C, the late strength development of concrete containing FA is slow for the same curing conditions. The effect of the late performance of resistance to chloride ion permeability improved by FA is better than the effect improved by GGBS. The risk of destroying the structure of concrete containing a large portion of FA or GGBS due to delayed ettringite formation (DEF) is minimal when specimens were steam-cured at 80°C.

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