Tests and Criteria for Concrete Resistant to Chloride Ion Penetration

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Title: Tests and Criteria for Concrete Resistant to Chloride Ion Penetration

Author(s): Karthik H. Obla, Colin L. Lobo, and Haejin Kim

Publication: Materials Journal

Volume: 113

Issue: 5

Appears on pages(s): 621-631

Keywords: ACI 318; building code; chloride; corrosion resistance; diffusivity; performance-based specifications; permeability; pore solution conductivity; sorptivity

Date: 9/1/2016

Abstract:
This paper presents a portion of a state highway agency pooled fund research project to develop performance criteria for concrete that will be resistant to penetration of chlorides, cycles of freezing and thawing, and sulfate attack. This paper presents the portion of the study pertaining to penetration of chlorides. To simulate standard and service conditions, specimens were subjected to either immersion or to a cyclic wetting and drying exposure in chloride solution. Measured apparent chloride diffusion coefficients, determined in accordance with ASTM C1556, were correlated with results of rapid index test methods that provide an indication of the transport characteristics of concrete. Rapid index test methods included were rapid chloride permeability, rapid migration, conductivity, absorption, and initial and secondary sorptivity. A set of rapid index test methods and specification criteria that can reliably classify mixtures based on their resistance to chloride ion penetration are proposed.