- Author
-
Ferraris, C. F.
|
Garboczi, E. J.
|
Stutzman, P. E.
|
Winpigler, J. A.
|
Clifton, J. R.
- Title
- Influence of Silica Fume on the Stresses Generated by Alkali-Silica Reaction.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Journal
-
Cement, Concrete, and Aggregates,
Vol. 22,
No. 1,
73-78,
June 2000
- Keywords
-
alkali silica reaction
|
mortar
|
silica fume
|
stress measurements
|
stress relaxation
- Identifiers
- Scanning Electron Microscope (SEM)
- 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.