Variability and Specification Requirements of Drying Shrinkage of Concrete

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Title: Variability and Specification Requirements of Drying Shrinkage of Concrete

Author(s): A. Leshchinsky, J. Pattison and L. Dobkin

Publication: Special Publication

Volume: 170

Issue:

Appears on pages(s): 1271-1282

Keywords: Concretes; drying; shrinkage; variability.

Date: 7/1/1997

Abstract:
In hot climate countries drying shrinkage of concrete is one of the major characteristics influencing its durability. In Australia, the majority of project specifications for concrete with requirements on durability set up criteria for drying shrinkage. Incorrect specification of this characteristic affects concrete durability and/or increases costs of construction. The paper analyses different sources of drying shrinkage variability, namely, metrological, within-sample, batch-to-batch, day-to-day, etc. The variabiiity of drying shrinkage resuits is compared with that of compressive strength data. Project specification requirements in terms of frequency of testing and acceptance criteria of drying shrinkage are discussed. The authors provide recommendations on drying shrinkage for project specification requirements which (a) decrease the consumer’s risk from the stand point of guarantee of getting the specified drying shrinkage and (b) decrease the concrete producer’s risk in the case of non-compliance of concrete in terms of drying shrinkage.