INFLUENCE OF HCL CORROSION ON THE MECHANICAL PROPERTIES OF CONCRETE

One of the main causes for deterioration in concrete structures is the corrosion of concrete due to exposure to harmful chemicals, including acid rain, some ground waters, industrial effluents, and seawater. In the presence of waters containing chlorides, cement mass is chemically exposed to the pH of the incoming water that produces a progressive neutralization of the alkaline nature of the cement paste, removing alkalis and dissolving portlandite and CSH gel. This article reports on a study of corrosion damage in three types of concrete (C25, C45, and C55), resulting from HCl with various contents. The study compared the mechanical properties of different types of concrete and their corrosion damage, focusing on the influence of HCl corrosion on the strength and stiffness of concrete. The test samples that were cured for 360 days were exposed in an aggressive environment (with 5%, 10%, 15%, and 20% HCl content, respectively) for 24 h. The mass loss, the dynamic modulus loss, the flexural strength, and the compressive strength were measured using a series of the etched samples. The authors conclude that the damage that results from HCl corrosion is dangerous for the safe application of concrete structures, especially when the structure is subjected to tensile or bending load. After HCl corrosion, the flexural strength loss of the high-strength concrete is larger than that of the normal-strength concrete, which indicates that the sensitivity to HCl corrosion increases with increasing strength grade of concrete. On the other hand, the loss of both the mass and the elastic modulus, caused by HCl corrosion, was in reverse proportion to the strength grade of concrete.

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    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Huang, P
    • Bao, Yue
    • Yao, Y
  • Publication Date: 2005-3

Language

  • English

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  • Accession Number: 00989037
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 29 2005 12:00AM