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Published in:
2020 | OriginalPaper | Chapter
Influence of Thermal Preconditioning on the Mechanism of External Sulphate Attack
Authors : S. Boudache, E. Rozière, A. Loukili, H. Colina
Published in: External Sulphate Attack – Field Aspects and Lab Tests
Publisher: Springer International Publishing
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Abstract
During external sulphate attack, the penetration of sulphates within the material is the rate-limiting step. Thus laboratory tests can last a few years before giving usable results. It is possible to shorten the response time by stimulating the penetration of sulphates. One way to achieve that is to dry the material at 60 °C then to saturate it with a sulphate solution before the test. The impact of this thermal pre-conditioning on the sulphate attack phenomenology still remains unclear. Two external sulphate attack tests have been set on two mortar cylinders each. The monitoring of the degradation process made it possible to investigate the influence of the thermal pre-conditioning. The mechanism of external sulphate attack appeared similar for the two tests. Although the mortar cylinders with thermal pre-conditioning showed stronger degradation earlier according to certain parameters (mass, volume, radius), there was no difference regarding the beginning of the expansion.