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The effect of water-reducing admixtures on drying shrinkage

Q. What is the effect of water-reducing admixtures on drying shrinkage?


A. Very little. Although the use of water-reducing admixtures will permit a reduction in water content of the concrete mixture, it will usually not result in a decrease in drying shrinkage. Actually some of the admixtures may even increase the early shrinkage; although, later shrinkage will be about the same as that of comparable mixtures without the admixture (ACI 224R).


References: SP-1(02); E4-12; ACI 212.3R-16; SP-288; ACI 224R-01

Topics in Concrete: Admixture; Concrete Fundamentals; Durability; Shrinkage

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