Influence of Silica Fume on the Stresses Generated by Alkali-Silica Reaction.
Influence of Silica Fume on the Stresses Generated by
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.
alkali silica reaction; mortar; silica fume; stress
measurements; stress relaxation
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.