M.Sc. Tezi Görüntüleme | |||||||||||||||||||||
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| Summary: In this study the effects of mineral additives in mitigating of alkali-silica reaction has been investigated. To perform this investigation, a quarry aggregate and a river aggregate was tested. The aggregate obtained from a quarry was reactive while the river aggregate was potentially reactive according to the measurements obtained in accordance with ASTM C 1260 accelerated mortar bar method. In the experimental program, mortar bars were produced using fly ash, silica fume and metakaolin at different ratios replaced by cement for both aggregates to determine the effectiveness in mitigating alkali-silica reactivity in relation with the mineral replacement. Cement was replaced at ratios of 20%, 40%, and 60% by fly ash in the mortars incorporating quarry aggregate while it was replaced at ratios of 5%, 10%, and 15% by silica fume and it was replaced at ratios of 5%, 10%, and 15% by metakaolin. In mortars produced with river aggregate, cement was replaced at 10%, 20%, and 30% by fly ash while it was replaced at 5%, 7.5%, and 10% by silica fume and it was replaced at 5%, 7.5%, and 10% by metakaolin. For comparison, mortars were also produced without mineral additives.Consequently, the mitigating effect of using mineral additives, being more pronounced for increased replacement ratios for fly ash; is a clear indication in improving the alkali-silica reactivity as replacement ratios increase regardless of the type of mineral additives used. Keywords: Aggregate, Alkali-Silica Reaction, ASTM C 1260 Accelerated Mortar Bar Test, Mitigating Alkali-Silica Reaction, Mineral Additives. | |||||||||||||||||||||