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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: The Ready Mixed Concrete Producers’ View of In Situ/NDT Testing
Author(s): Ken Newman
Publication: Special Publication
Appears on pages(s): 479-500
Keywords: compressive strength; nondestructive tests; quality
control; ready-mixed concrete; specifications.
Abstract:This paper examines the influence of workmanship on the properties of concrete and the difference between the results obtained from standard specimen and in-situ tests. Few reinforced concrete engineers appear to understand the relevance and meaning of the results of in-situ/NDT tests. These methods measure concrete properties in the actual structure (i.e. "real-Crete") which engineers should be interested in, whereas they still place undue emphasis on the results from standard tests (i.e. "lab-Crete"). The respective responsibilities of the ready mixed concrete producer and contractor are defined. Recommendations are made for improving the reliability of compressive testing by means of standards for testing machines and their use, for differentiating between "lab-Crete" and "real-Crete" by providing guidance on the assessment of concrete strength in existing structures, and for specifying the required concrete properties in terms of the "lab-Crete" compressive strength.
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