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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Adoption of Resistivity Tests for Concrete Acceptance
Author(s): Robert Douglas Hooton and Gita Charmchi
Publication: Special Publication
Appears on pages(s): 269-280
Keywords: electrical resistivity; durability; indicator test; chloride resistance
Abstract:For concrete in severe environments, measurement of its resistance to fluid ingress is fundamental to evaluating its potential durability. As a rapid index of concrete’s resistance to fluid penetration there is interest in standardization of a bulk electrical resistivity test. In this study, tests were conducted on a range of concrete mixtures using a bulk resistivity test as well as the ASTM C1202 coulomb test and the Nordtest NT492 rapid migration test. With the objective of development of a performance-based standard for bulk resistivity, rather than specifying the details of the equipment to be used, a verification cell using precision resistors was used to determine the accuracy of results obtained using three different commercially available resistivity test devices. In addition, the influence of conductive coupling gels or water on the resistivity values were evaluated. The results from the verification cell tests demonstrate that all three commercially available test devices are accurate within 4.5% at low resistivity levels (39 ohm-m) and within 1.0% at higher resistivity levels (390 ohm-m). As well, use of water soaked sponges to couple the concrete to the electrodes gave essentially the same results as when a conductive gel was used. For the concretes tested, exponential relationships were obtained between bulk resistivity and either ASTM C1202 coulomb results (r2 = 0.992) or Nordtest NT492 migration results (r2 = 0.86).
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