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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: CONFUSION ON CHLORIDE LIMITS IN SPECIFICATIONS THAT CHALLENGE THE INDUSTRY
Author(s): Colin L. Lobo
Publication: Special Publication
Appears on pages(s): 1-8
Keywords: Building code; Chlorides; Corrosion; Durability; Exposure classes; Specification; Specification limits.
Abstract:Chloride limits in concrete are intended to ensure that composition of concrete mixtures do not cause corrosion of reinforcement. This paper provides a brief overview of the requirements in industry standards and discusses some of the test methods used for chloride limits. Estimation of total chloride content in concrete mixtures calculated from the materials and mixture proportions is outlined. It is suggested that the calculated chloride content is a conservative estimate of the available chlorides for corrosion and can be used as an alternative to testing for water soluble chlorides in concrete. The results of a survey of ready mixed concrete producers indicate that chloride limits in concrete are not often required or enforced. Requirements in specifications for concrete vary considerably, are not consistent with Code requirements and often result in contradictory interpretation and requirements.
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