SEDL / STP / STP1240-EB / STP14109S

Influence of Silica Fume on the Immobilization Properties of Cementitious Mortars Exposed to Freeze-Thaw Cycles

Quaresima, R
Professors, University of L'Aquila,

Scoccia, G
Professors, University of L'Aquila,

Volpe, R
Professors, University of L'Aquila,

Medici, F
Professors, University of Rome “La Sapienza”, Rome,

Merli, C
Professors, University of Rome “La Sapienza”, Rome,

Pages: 12    Published: Jan 1996

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Abstract

This study deals with the durability of immobilization matrices, drawing comparisons among the release characteristics of cementitious mortars with or without silica fume, before and after freezing-thawing cycles. Three different dosages of silica fume have been experimented, using silica fume as a substitute of cement. The results obtained from the leaching tests have emphasized, in all the matrices which had undergone the freeze-thaw cycles, an increase of the percentage of tracer released with respect to the same matrices before the freezing-thawing cycles. As a consequence of the freezing-thawing cycles, the velocity of release has also increased in all the experimented matrices. However, the tests have reconfirmed the positive effect of the addition of silica fume.