Carbonation resistance of sulphoaluminate cement-based high performance concrete

Abstract

The influences of water/cement ratio and admixtures on carbonation resistance of sulphoaluminate cement-based high performance concrete (HPC) were investigated. The experimental results show that with the decreasing water/cement ratio, the carbonation depth of sulphoaluminate cement-based HPC is decreased remarkably, and the carbonation resistance capability is also improved with the adding admixtures. The morphologies and structure characteristics of sulphoaluminate cement hydration products before and after carbonation were analyzed using SEM and XRD. The analysis results reveal that the main hydration product of sulphoaluminate cement, that is ettringite (AFt), decomposes after carbonation.

Keywords

sulphoaluminate cement / carbonation / high performance concrete (HPC) / admixture / ettringite

References

[1] Wang Y., Su M., Zhang L. Sulphoaluminate Cement[M], 1999 Beijing Beijing Industrial University Press

[2] Feng N. High Performance Concrete[M], 1996 Beijing China Architecture & Building Press

[3] Pera J., Ambroise J. New Application of Calcium Sulfoaluminate Cement[J]. Cement and Concrete Research, 2004, 34(4): 671-676.

[4] L Zhang, Al Glasser. New Concretes based on Calcium Sulfoaluminate Cement[C]//Proceedings of the Internations Conference on Modern Concrete Materials: Binders, Additions and Adimixers, 1999: 261–274

[5] Su Muzhen. Analysis of Sulphoaluminate Cement Durability [N]. China Building Material Newspaper, 2004: 9–2(in Chinese)

[6] Wu Zhongwei. Development Prospects and Problems of High Performance Concrete[J]. Architecture Technology, 1998, (1): 8–13(in Chinese)

[7] Diao J. Production and Application of Sulphoaluminate Cement[M], 2006 Beijing China Building Materials Industry Press