01598964

Component

The resistance of concrete to chloride ion penetration is one of the most important durability properties. The diffusion coefficient is the best measurement of chloride penetration resistance, but can only be determined from chloride ponding tests which may take several months to complete. Accelerated test methods like rapid chloride penetrability test (RCPT) and bulk resistivity have proven effective in rapidly estimating chloride penetration resistance in portland cement concrete. These methods effectively measure the electrical properties of concrete, which are sensitive to the porosity and the conductivity of the pore solution. Due to the high ionic concentration in alkali-activated concrete (AAC), electrical test methods like RCPT and bulk resistivity may result in unsafely high electrical currents at worst or misleading results at best. This paper discusses the results and interpretation of such electrical test methods for AAC and investigates modifications to the RCPT procedure which may improve its applicability to AAC. The results indicate that increasing the RCPT specimen length from 51 mm to 153 mm reduces the electrical current to safe levels. The initial current and cumulative charge vary approximately linearly with specimen length, and the results show excellent agreement with bulk resistivity and porosity data.

This paper was sponsored by TRB committee AFN30 Standing Committee on Durability of Concrete.

01584066

16-5098

English

16p

2016

Transportation Research Board 95th Annual Meeting

Digital/other

Figures; References; Tables

Alkali; Chlorides; Durability; Electrical conductivity; Electrical resistivity; Ions; Permeability; Porosity; Portland cement concrete

Rapid Chloride Permeability Test

Highways; Materials

Transportation Research Board Annual Meeting 2016 Paper #16-5098

TRIS, TRB, ATRI

Jan 12 2016 6:13PM