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Home > Tools > Frequently Asked Questions
Q. Why is the slump test not an absolute measure of consistency or workability? A. It does not distinguish between mixtures of different character. For example, a harsh coarse mixture and one with a large proportion of fine aggregate having the same slump cannot be said to have the same consistency. This is even more true in the case of workability. With air-entrained concrete, however, with its inherently greater plasticity and cohesiveness, the slump is a better measure of both consistency and workability. References: SP-1(02); ACI 238.1R-08; ASTM C143 Topics in Concrete: Concrete Fundamentals; Testing of Concrete
Q. Why is the slump test not an absolute measure of consistency or workability?
A. It does not distinguish between mixtures of different character. For example, a harsh coarse mixture and one with a large proportion of fine aggregate having the same slump cannot be said to have the same consistency. This is even more true in the case of workability. With air-entrained concrete, however, with its inherently greater plasticity and cohesiveness, the slump is a better measure of both consistency and workability.
References: SP-1(02); ACI 238.1R-08; ASTM C143
Topics in Concrete: Concrete Fundamentals; Testing of Concrete
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