Form and mechanism of sulfate attack on cement-based material made of limestone powder at low water-binder ratio under low temperature conditions

Abstract

The development of strength and the form of attack of cement-based material made of limestone powder at low water-binder ratio under low-temperature sulfate environment were studied. The results indicate that when water-binder ratio is lower than 0.40, the cement-based material with limestone powder has insignificant change in appearance after being soaked in 10% magnesium sulfate solution at low temperature for 120 d, and has significant change in appearance after being soaked at the age of 200 d. Expansion damage and exfoliation occur on the surface of concrete test cube at different levels. When limestone powder accounts for about 28 percent of cementitious material, with the decrease of water-binder ratio, the compressive strength loss has gradually decreased after the material is soaked in the magnesium sulfate solution at low temperature at the age of 200 d. After the specimen with the water-binder ratio of less than 0.4 and the limestone powder volume of greater than 20% is soaked in 10% magnesium sulfate solution at low temperature at the age of 200 d, gypsum attack-led destruction is caused to the concrete test cube, without thaumasite sulfate attack.

Keywords

low water-binder ratio / limestone powder / cement-based material / low-temperature sulfate attack concrete

References

[1] Xiao J., Deng D.-h., Tang X., . Effects of Fly Ash on the Chloride Diffusivity of Concrete with Limestone Powder[J]. Journal of Central South University of Forestry & Technology, 2007, 27(5): 79-82.

[2] Song Shaomin, Liu Juanhong, Xu Guoqiang. Summarize and Research on Application of Limestone Powder in Concrete[J]. China Concrete, 2009(12):38–43

[3] Chen J., Cui H., Chen Hanbin. Study on Performance of Concrete Mixed with Ultra-fine Limestone Flour[J]. Construction Technology, 2004, 33(4): 39-41.

[4] Li B., Chen Feng. Study on the Mechanical Property of Portland Limestone Cement[J]. Journal of Building Materials, 1998, 1(2): 186-191.

[5] Tian Qian. Mineral Additives of Self-compacting High Performance Concrete[J]. China Concrete and Cement Products, 2000(5):18–20

[6] Crammond N. J. The Thaumasite Form of Sulfate Attack in the UK[J]. Cement and Concrete Composites, 2003, 25: 809-818.

[7] Erlin B., Stark D. C. Identification and Occurrence of Thaumasite in Concrete[J]. Highway Research Record, 1965, 11: 108-113.

[8] Slater D., Floyd M., Wimpenny D. E. A Summary of the Highways Agency Thaumasite Investgation in Gloucestershire:the Scope of Work and Main Findings[J]. Cement and Concrete Composites, 2003, 25: 1 067-1 076.

[9] Crammond N. The Occurrence of Thaumasite in Modern Construction-A Review [J]. Cement and Concrete Composites, 2002, 24: 393-402.

[10] Collepardi M. Thaumasite Formation and Deterioration in Historic Buildings[J]. Cement and Concrete Composites, 1999, 21: 147-154.

[11] Wang Z., Gao X., Ma Baoguo. Deterioration Mechanism of Limestone Filler Cement Mortar Exposed to Sulfate Attack at Lower Temperature[J]. Journal of Shenyang Jianzhu University (Natural Science), 2008, 24(1): 95-99.

[12] Gao X., Ma B., Zhu Hongbo. Sulfate Attack on Cement Mortar Containing Limestone Powder at lower Temperature[J]. Chinese Journal of Materials Research, 2005, 19(6): 644-650.

[13] Gao L., Yao Y., Wang Ling. Effects of Temperatures on Thaumasite Formation[J]. Journal of the Chinese Ceramic Society, 2005, 33(4): 525-527.

[14] Deng D., Xiao J., Yuan Qiang. Effect of Limestone Powder on the Sulfate-Resistance of Materials Based on Cement and Its Mechanisum[J]. Journal of the Chinese Ceramic Society, 2006, 34(10): 1 243-1 248.