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Alkali-silica reaction (ASR) is a chemical reaction that cause to cracking and led to deterioration of concrete in a short time because of led to huge expansion in the concrete. The increase of temperature, humidity and pressure increases these reactions. In this study, the alkali silica reaction (ASR) development was investigated in silica fume blended mortars produced with different aggregates. In the production of mortars, natural sand, crushed sand, waste concrete sand and waste marble sand were used. Silica fume was replaced with cement in ratio of 0%, 10%, 20%, 30% and 40% by weight in the in the mixtures. ASR test was conducted according to ASTM C 1260 standards. Mortar bars (25×25×285 mm) have been exposed to high alkali environment and high temperatures for 14 days. Then, the influence of aggregate type and silica fume was determined on the effect of ASR by measuring the length change of mortar bars. According to the results obtained, the maximum expansion was seen in mortars with the natural sand, and the minimum expansion was observed in mortars produced with limestone aggregate origin. On the other hand, by use of silica fume in ratio of 10%-30%, it was observed that expansion of all the mortars was significantly decreased. [ABSTRACT FROM AUTHOR]