Proposing new methods to appraise segregation resistance of self-consolidating concrete based on electrical resistivity

The static segregation of self-consolidating concrete (SCC) can lead to some problems in the long-term properties of concrete. While there are few methods to evaluate the risk of segregation, which some of them are not precise and applicable, proposing new methods can be beneficial. In this experiment, two methods based on electrical resistivity were used in order to appraise and compare different mixtures of self-consolidating concrete. In order to verify the attained results, column technique (ASTM C 1610) was also used. Seven mixtures containing fly ash and silica fume as partial replacements of cement were analyzed. Slump, J-ring flow and compressive strength of the samples were measured. The results revealed that increase in fly ash replacement resulted in higher segregation index (SI), higher periodic segregation index (PSI) and higher instant segregation index (ISI) at specific times. However, substitution of silica fume lead to lower SI, lower PSI and lower ISI at specific times. In overall, the results indicated that general trend of the mixtures is in good agreement with each other, and positive correlation between SI with PSI and ISI exist. (C) 2017 Elsevier Ltd. All rights reserved.