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A reply to the discussion of “mechanism of sulfate attack on portland cement concrete — another look” by S. Chatterji

✍ Scribed by P.K. Mehta

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
55 KB
Volume
14
Category
Article
ISSN
0008-8846

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✦ Synopsis

In regard to Dr. Chatterji's comments, the author agrees that many investigators including Lea have pointed out the detrimental effect on strength associated with gypsum formation during sulfate attack on portland cement concrete. In the earlier literature, however, the strength loss due to gypsum formation and the expansion due to ettringite formation are treated as isolated phenomena which have no effect on each other. This author feels that both the phenomena need to be considered together in order to appreciate and understand the complexity of sulfate-generated deteriorations in concrete. Therefore, it is suggested that a drop in the strength and stiffness (restraining capacity of the material) due to gypsum formation be seen as a necessary step for increasing the magnitude of expansion caused by ettringite. The concept is consistent with the experimental observations of the reverse phenomenon by many researchers, i.e. expansions associated with ettringite formation can be greatly reduced when restrained.

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