SYMPOSIA PAPER Published: 01 January 1980
STP36064S

Microstructure of Concrete in Aggressive Environments

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All the constituents of concrete can be attacked. Some degradations occur after a long period of time. So, it is important to know the chemical and physical mechanisms of the corrosion and the behavior of built structures. In our studies on the durability of concrete, chemical and technological tests have been completed by microstructure examination with scanning electron microscopy and X-ray diffraction. In the present stage of our research into the attack of concrete by seawater, several factors can be noted. The formation of expansive ettringite is related to the content, the crystalline form, and the granularity of tricalcium aluminate. The carbonation reaction transforms ettringite into thaumasite. The dissolving of lime-rich compounds like hydrated silicates C-S-H brings about their progressive transformation into Ca-Mg silicates. Some aggregates have been found to have reacted with alkalis. A dense concrete with a high cement content will offer a good resistance to chemical and physical attacks.

Author Information

Regourd, M
Centre D'Etudes et de Recherches de L'Industrie des Liants Hydrauliques, Paris, France
Hornain, H
Centre D'Etudes et de Recherches de L'Industrie des Liants Hydrauliques, Paris, France
Mortureux, B
Centre D'Etudes et de Recherches de L'Industrie des Liants Hydrauliques, Paris, France
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Details
Developed by Committee: E06
Pages: 253–268
DOI: 10.1520/STP36064S
ISBN-EB: 978-0-8031-4768-3
ISBN-13: 978-0-8031-0325-2