Paper Title:
Sulfate Crystallization Attack on Cement-Based Materials
  Abstract

The physical crystallization action of sulfate in cement based material, which often occurs by dry-wet cycle, capillary rising and evaporating action, can damage seriously cement-based materials as compared to chemical corrosion by sulfate. The deterioration mechanism of cement-based materials by sulfate crystallization attack, experimental investigations of the process of sodium sulfate crystallization and the factors affecting the process, and the invading track of salt solution by capillary effect are presented in this paper. Results show that the crystal type and crystallization velocity of sodium sulfate is influenced greatly by relative humidity and ambient temperature. There is a close relationship between invading depth and the porosity of concrete. Addition of mineral admixture to concrete can significantly reduce the invading depth of sodium sulfate solution and thereby enhance the resistance of concrete to sulfate crystallization attack.The profile of invading track of salt solution by capillary effect is similar to the shape of concave parabola.

  Info
Periodical
Key Engineering Materials (Volumes 400-402)
Edited by
Jingsi Huo, Yan Xiao, Zongjin Li and Shuaib Ahmad
Pages
89-99
DOI
10.4028/www.scientific.net/KEM.400-402.89
Citation
Y. J. Xie, K. L. Ma, G. C. Long, "Sulfate Crystallization Attack on Cement-Based Materials", Key Engineering Materials, Vols. 400-402, pp. 89-99, 2009
Online since
October 2008
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Price
$32.00
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