Concrete Strength-Quality Assuranceby Bryant Mather, US Army Engineer Waterways, Experiment Station, United States,
Abstract: The usual criterion for establishing grades of structural concrete is the compressive strength measured in an arbitrary manner on a standardized specimen stored in a stipulated fashion for approximately a month after making. In some parts of the world the specimen is a cube and in other parts of the world the specimen is a cylinder. There have been extensive debates as to which shape is to be preferred. More recently there have been debates as to how the strength at 28 days can be predicted from procedures performed at early ages, especially 24 hours, on the grounds that a month isn't soon enough to obtain assurance that the concrete will develop the strength used as an index of quality. The intent of this paper is to suggest that the only time that really is soon enough to know that the grade of any concrete batch is correct is before the concrete is discharged from the concrete mixer into the forms.
Subject Headings: Compressive strength | Quality control | Standards and codes | Concrete structures | Structural concrete | Structural strength
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