Experimental Assessment of Electrically Accelerated Chloride Permeability Tests for Concrete

Document Type : Research Paper

Authors

1 Ph.D., Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran

2 Professor, Department of Civil & Environmental Engineering, Amirkabir University of Technology, Tehran

3 Assistant Professor, Concrete Technology and Durability Research Center, Amirkabir University of Technology, Tehran

Abstract

The present study is an exploratory research that appraise and compare the performance of four rapid tests for assessing the chloride penetration of concrete; RCPT, RCMT, SR and MRCPT. Due to the concern raised by some scholars about the effect that the conductivity of the pore solution impinges upon the results on some of these rapid tests, Silica fume was used as Supplementary cementitious material in portions of 7.5% and 15%. All four methods exhibited substantial decrease in the chloride permeability of the concrete samples with silica fume as compared to control samples, at the age of 28 days. The increase in performance caused by Silica fume usage was significant for RCPT and SR methods, moderate for RCMT and marginal for MRCPT. The results show that the variation in the conductivity of the pore solution significantly alters the results of SR and RCPT tests, and marginally alters those of MRCPT.

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