Application of Rapid Chloride Permeability Test to Quality Control of Concrete


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Title: Application of Rapid Chloride Permeability Test to Quality Control of Concrete

Author(s): S. Misra, A. Yamamoto, T. Tsutsumi, and K. Motohashi

Publication: Special Publication

Volume: 145


Appears on pages(s): 487-502

Keywords: blast furnace slag; chlorides; compressive strength; concretes; corrosion; coulombs; curing; diffusivity; durability; fly ash; permeability; reinforcing materials; silica fume; structural design; tests; General

Date: 5/1/1994

It is important to have an accurate understanding of the chloride permeability of concrete, especially in the case of RC structures that are susceptible to reinforcement corrosion. The Rapid Chloride Permeability Test (RCPT, AASHTO T-277 831) has often been used during the past several years for a quick evaluation of the chloride permeability of concrete and for comparing the performance of different concrete mixtures. Presents a summary of some of the valuable experimental results published and also briefly discusses the authors' own experience with this method, gathered during a research program presently underway to monitor the chloride permeability of various concretes at different levels of hydration under varying conditions. A study of the literature reveals that AASHTO T-277 has been used for a large variety of concrete mixtures, including those using supplementary cementitious materials, curing conditions, etc., and several attempts have been made to relate the coulombs (obtained using AASHTO T-277) to other parameters and characteristics of concrete, such as resistivity, pore structure, etc. Some of the results from the authors' study included in the paper also show that it may be better at times to work with other voltages than 60 V, and an appropriate conversion factor can be determined to compare the results at different voltages. Further, it was found that, in general, the coulombs decrease as the compressive strength increases, and concrete containing supplementary cementitious material gives lower coulombs at a given strength, which reduce further as the replacement level increases. Paper also discusses some of the possible applications of AASHTO T-277 as a tool for quality control, inspection, and design in concrete engineering.