Abstract

The results confirm that the self-desiccation of normal density (ND) high strength concrete may prevent delayed ettringite formation (DEF). However, when using lightweight aggregate (LWA), the initial water content of the LWA grains seems to be sufficient to give some DEF. The results also confirm that the critical temperature, provided that the moisture content is sufficiently high, is in the range of 65 to 70°C for ND concrete with Norwegian cements. The critical temperature for LWA concrete seems to be somewhat higher; above 70°C. The LWA expansion due to DEF seems to be somewhat lower than the expansion of ND concrete, provided they have the same binder and paste quality. The volume increase coincides with an extensive compressive strength reduction. The reported results confirm that addition of silica fume (5%) in combination with the investigated cements, seems to prevent or eliminate the DEF.

Author Information

Rønne, M
SINTEF Civil and Environmental Engineering, Cement and Concrete, Trondheim, Norway
Hammer, TA
SINTEF Civil and Environmental Engineering, Cement and Concrete, Trondheim, Norway
Pages: 10
Price: $25.00
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Details
Stock #: CCA10434J
ISSN: 0149-6123
DOI: 10.1520/CCA10434J