Investigation of Nevşehir Perlite Aggregate in Terms of Alkali Silica Reaction
Abstract
The alkali silica reaction (ASR) is a highly complex chemical reaction that adversely affects the durability of reinforced concrete elements today. Alkaline silica gel is formed in the pores in the concrete when sufficient moisture is reached as a result of the combination of the alkalis in the cement and the amount of reactive silica in the aggregate. With this formation, alkali silica reaction begins. As a result of the water absorption of alkali silica gels, the internal stresses of the concrete increase and it causes damage by creating capillary cracks in the concrete. In this study, the effect of perlite aggregate obtained from Nevşehir region on alkali silica reaction was investigated. In this regard, accelerated mortar bar test (ASTM C 1260) method was carried out. Mixtures were prepared by replacing the crushed limestone aggregate with the perlite aggregate at 0, 10, 20, 30, 40, 50, 60 and 70 wt.% ratios. The length change values of these samples at 7, 14 and 28 days were measured. It was observed that the perlite aggregate substituted for the limestone aggregate in the mortar bars increased the alkali silica reaction.
Keywords
Alkali silica reaction, perlite aggregate, accelerated mortar bar test method, The length changes
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