Influence of Fly Ash and Silica Fume on Anti-Corrosion Characteristics of Mortar in Sulfuric Acid

Abstract:

A long term immersion test of mortar in sulfuric acid is carried out to investigate the effects of fly ash (FA) and silica fume (SF) on anti-corrosion characteristics. The mortar specimens have water to binder ratios (W/B) ranging from 0.5 to 0.7 and are divided into two series. Series one uses admixture of FA with replacement ratio from 0~0.3 and series two uses admixture of SF with replacement ratio from 0~0.1. The specimens are soaked in sulfuric acid with a pH value of 3.50 for 150 days. The portable pH meter is used to monitor the pH changing of the soak solution. The titrating sulfuric acid with concentration of 0.125mol/l is added to maintain the original pH value of the solution and then sulfuric acid consumption of specimens is recorded. A partial correlation analysis of experiment results shows that the effects of FA and SF on mortar resistance to sulfuric acid would change with the water binder ratio.

• Periodical: Advanced Materials Research (Volumes 261-263)
• Pages: 306-312
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.261-263.306
• Online since: May 2011
• Authors: Hong Guang Min, Zhi Gang Song, Yan Tao Li, Yi Jie Shen
• Keywords: Corrosion, Fly Ash (FA), Mortar, Silica Fume (SF), Sulfuric Acid

References

[1] D. Israel, D.E. Macphee, E.E. Lachowski. Acid Attack on Pore-reduced Cements [J]. Journal of Materials Science, Vol. 32(15) (1997), pp.4109-4116.

DOI: 10.1023/a:1018610109429

[2] Q. Zhou, J. Hill, E.A. Byars, et al. The Role of pH in Thaumasite Sulfate Attack [J]. Cement and Concrete Research, Vol. 36(1) (2006), pp.160-170.

DOI: 10.1016/j.cemconres.2005.01.003

[3] J. Hill, E.A. Byars, J.H. Sharp, et al. An Experimental Study of Combined Acid and Sulfate Attack of Concrete [J]. Cement & Concrete Composites, Vol. 25(8)(2003), pp.997-1003.

DOI: 10.1016/s0958-9465(03)00123-9

[4] E. Hewayde, E.N. Allouche, G.F. Nakhla. Experimental Investigations of the Effect of Selected Admixtures on the Resistance of Concrete to Sulfuric Acid Attack [C]: 2003 ASCE International Conference on Pipeline Engineering and Construction, vol. 1. Baltimore, Maryland, USA: Pipelines, pp.504-513(2003).

DOI: 10.1061/40690(2003)33

[5] Xiao Jia, Zhou Shiqiong. Effect of Low-calcium Fly Ash on Cement Mortar Strength in Acid Rain Condition [J]. Journal of Building Materials, Vol. 8(2005), pp.440-445.

[6] Chen Feng, Xiao Jia, Tang Xianyan. Experiment Study of Effect of Fly Ash on Anti-Corrosion Performance of Cement Mortar under Simulated Acid Rain Environment [J]. Coal Ash China, Vol. 6(2006), pp.11-13.

[7] Hou Xiaoyan. The Change of Strength of Fly Ash Cement Mortar under Simulated Acid Rain Environment [J]. Henan Building Materials, Vol. 2(2007), pp.37-38.

[8] GB/T 17671-1999, Method of Testing Cements-Determination of Strength [S]. Beijing, China: China Standards Press(1999).

[9] GB/T 2419-2005, Test Method for Fluidity of Cement Mortar [S]. Beijing, China: China Standards Press(2005).

[10] Song Zhigang, Zhang Xuesong and Min Hongguang. Corrosion of Mortar by Sulfuric Acid - Experiment and Theoretic Analysis [J]. Journal of Wuhan University of Technology (Material Science). To be pressed.

[11] Ma Qingguo. Statistics for Managers: Data Acquisition, Statistics, SPSS Tools and Applied Research [M]. Beijing, China: Science Press(2002).