Journals Proceedings

Abstract

In this study, the effect of NaCl and MgCl2 salts in lightweight concrete (LWC) with raw perlite aggregate was investigated. For this purpose, 360 concrete samples with Ø100/200 mm cylindrical shape were produced. In concrete mixture, the Micro Silica Fume (SF) and Fly Ash (FA) were replaced with cement at the rate of 10% and 20% of its weight, respectively. The produced concrete samples before were waited in standard water curing for 28 days and then they were subjected to Sodium Chloride and Magnesium Chloride solutions at the rate of 3.5% and 5.0% further in mixtures of these at the rate of 1.75%+1.75% for 28, 90, 56 days. Besides, the standard water curing was applied to samples. The compressive strength, unit weight and water absorption standard tests were made on three samples for each condition and average results obtained from tests were given in this paper. The results showed that; the effect of MgCl2 solutions on samples with additives of 10% SF and 20% FA was fewer compared to standard samples. Besides, NaCl solution and the mixture of these two salts had little effect on LWC. On the other hand, the more MgCl2 solution penetrated into the concrete; because of the specimens with 20% FA can absorb more water. As a result, in MgCl2 solution for 90 days, the standard samples were most affected; meanwhile the samples with 20% FA and the samples with % 10 SF were affected the least, respectively.