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A laboratory study of the resistance of CAC concretes to chemical attack by sulphate and alkali carbonate solutions
Results obtained from a laboratory investigation of the resistance of specimens cut from the interior and exterior of a metre cube of CAC concrete to a range of sulphate and alkali carbonate solutions are presented. A further study on the effects of curing condition on the resistance of 100 min cubes of CAC concrete to chemical attack is introduced. There was no evidence of deterioration in any of the exterior specimens from the metre cube stored in sulphate solutions. This agrees with practical experience, which indicates excellent resistance of CAC concrete to sulphates, superior to that of similar PC concretes. However, the rate of deterioration of the converted interior concrete was significantly greater than would be expected for PC concrete. These findings imply that large masses of highly converted CAC concrete could deteriorate more rapidly than expected under circumstances where the protection of the surface is breached (for example by physical damage or cracking). The good performance of the specimens in the alkali carbonate solutions agrees with other studies that have shown only relatively poor quality CAC concretes to he affected by alkaline solutions. This may explain why cases of alkaline attack of CAC concrete are relatively uncommon.
A laboratory study of the resistance of CAC concretes to chemical attack by sulphate and alkali carbonate solutions
Results obtained from a laboratory investigation of the resistance of specimens cut from the interior and exterior of a metre cube of CAC concrete to a range of sulphate and alkali carbonate solutions are presented. A further study on the effects of curing condition on the resistance of 100 min cubes of CAC concrete to chemical attack is introduced. There was no evidence of deterioration in any of the exterior specimens from the metre cube stored in sulphate solutions. This agrees with practical experience, which indicates excellent resistance of CAC concrete to sulphates, superior to that of similar PC concretes. However, the rate of deterioration of the converted interior concrete was significantly greater than would be expected for PC concrete. These findings imply that large masses of highly converted CAC concrete could deteriorate more rapidly than expected under circumstances where the protection of the surface is breached (for example by physical damage or cracking). The good performance of the specimens in the alkali carbonate solutions agrees with other studies that have shown only relatively poor quality CAC concretes to he affected by alkaline solutions. This may explain why cases of alkaline attack of CAC concrete are relatively uncommon.
A laboratory study of the resistance of CAC concretes to chemical attack by sulphate and alkali carbonate solutions
Laboruntersuchung zur Beständigkeit von CAC-Beton gegenüber Sulfatangriff und Alkalicarbonat
Dunster, A. (author) / Holton, I. (author)
2001
16 Seiten, 1 Bild, 9 Tabellen, 11 Quellen
Conference paper
English
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