NIST Time|NIST Home|About NIST|Contact NIST

HomeAll Years:AuthorKeywordTitle2005-2010:AuthorKeywordTitle

Influence of Silica Fume on the Stresses Generated by Alkali-Silica Reaction.


pdf icon Influence of Silica Fume on the Stresses Generated by Alkali-Silica Reaction. (3171 K)
Ferraris, C. F.; Garboczi, E. J.; Stutzman, P. E.; Winpigler, J. A.; Clifton, J. R.

Cement, Concrete, and Aggregates, Vol. 22, No. 1, 73-78, June 2000.

Keywords:

alkali silica reaction; mortar; silica fume; stress measurements; stress relaxation

Abstract:

Present test methods for determining the suitability of a given combination of cement and aggregates with respect to the potential for alkali-silica reaction (ASR) are based on the measurement of the expansion of the concrete/mortar under prescribed conditions. The scope of this study was to determine the influence of the addition of silica fume as a cement replacement on the stresses generated by the specimen, a parameter that could be useful for the engineer. Cylindrical specimens were placed in a frame equipped with a load cell that fixed the axial strain at approximately zero and measured the axial stress generated over time. A replacement of cement by silica fume at a dosage of 15% by mass for two different w/c ratios led to a significant decrease of the measured stress. SEM observations helped to provide a tentative explanation for the stress and expansion reduction mechanisms with the addition of silica fume.