Influences of Active Admixtures on Anti-Carbonization Performance of Concrete

Abstract

Abstract: The influence of strength grade (C30 and C45), age (28 d and 120 d) and mineral admixture (mineral powder and fly ash) mass content on the anti-carbonization performance of concrete mixed with high efficiency aliphatic superplasticizer(SAF) was studied. A regression model between the carbonization depth of C30/C45 concrete at 28 d/120 d age and the proportion of mineral powder/fly ash was established. The results show that the reduction of water-binder ratio and the extension of curing age improve the compactness of cement stone, which improve the compressive strength and carbonization resistance. The anti-carbonization performance of concrete increases with the increase in the amount of mineral powder and the decrease in the amount of fly ash. When the mass fraction of mineral powder in the cementing material is 37.5%, the carbonization resistance of C30 concrete is the best. When the mass fraction of mineral powder in the cementing material is 31.9%, the carbonization resistance of C45 concrete is the best. When the age increases, the greater the proportion of fly ash, the greater the decrease in carbonization depth. When the relative proportion of mineral powder and fly ash content changes, the degree of influence on low-strength concrete is greater than that of high-strength concrete.

Key words: concrete, fly ash, mineral powder, carbonization, age

CLC Number:

TU528

WANG Yilin, WANG Shunyao, LIU Qiaoling. Influences of Active Admixtures on Anti-Carbonization Performance of Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 439-446.

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