Abstract:

One of the most important chemical reactions affecting the durability of concrete is the alkali silica reaction (ASR). There are plenty of cherts in many of the quarries in Gümüşhane province. These cherts are used as concrete component together with fine and coarse aggregates obtained by separating from the bedrock by drilling and blasting method. In this study; The cherts (Akçakale, Gümüşhane ve Besyo) taken from 3 different regions of our province of Gümüşhane were brought to the concrete laboratory in our Gümüşhane University. Later, 3 different cherts and reference concrete mixtures taken from different regions were prepared and concrete samples were prepared according to ASTM C 1260 accelerated mortar bar standard. ASR measurements of the mortar samples belonging to the chert mixtures of each region at the end of 3, 7, 14 and 28 days were performed. The results are; it has shown that all samples produced with cherts have a higher length change value than the reference sample, and the length change values increase depending on the curing period. It is observed that 14-day lengthening results exceed the lengthening limit for 0.1 % hazardous aggregates specified in ASTM C 1260 and 28-day lengthening results exceeding the lengthening values of more than 0.2 %. As a result; It was understood that Akçakale, Gümüşhane and Besyo cherts were harmful to ASR considering the curing times of 14 and 28 days.

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