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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 > Tools > Frequently Asked Questions
Q. When is the slump test useful in detecting changes in the concrete? A. When the aggregates and cement content remain unchanged, the slump test gives a good measure of changes in consistency. Where the materials are being accurately measured, a change in the slump as the work proceeds indicates either a change in the grading of the aggregates or a change in water content or air content of the concrete. The slump test under these conditions can be a good basis for control. The use of water-reducing admixtures, however, makes it difficult to determine if the changes in consistency are due to a change in the mixing water content or the effects of the admixture. References: SP-1(02); ACI 238.1R-08; ASTM C143 Topics in Concrete: Concrete Fundamentals; Testing of Concrete
Q. When is the slump test useful in detecting changes in the concrete?
A. When the aggregates and cement content remain unchanged, the slump test gives a good measure of changes in consistency. Where the materials are being accurately measured, a change in the slump as the work proceeds indicates either a change in the grading of the aggregates or a change in water content or air content of the concrete. The slump test under these conditions can be a good basis for control. The use of water-reducing admixtures, however, makes it difficult to determine if the changes in consistency are due to a change in the mixing water content or the effects of the admixture.
References: SP-1(02); ACI 238.1R-08; ASTM C143
Topics in Concrete: Concrete Fundamentals; Testing of Concrete
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