Concrete Drying Shrinkage: Facts of Fallacies


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Title: Concrete Drying Shrinkage: Facts of Fallacies

Author(s): Paul P. Kraai

Publication: Special Publication

Volume: 76


Appears on pages(s): 25-52

Keywords: aggregates; cement types; concretes; cracking (fracturing); drying shrinkage; plastic shrinkage; tests.

Date: 10/1/1982

Concrete drying shrinkage, as measured by ASTM C-157--Length Change of Hardened Cement Mortar and Concrete, represents a total value which is influenced by the cement type, aggregate source, and the test method. Based on available test data, percentage values can be assigned to each of the above contributions. One purpose of this paper is to show that ASTM C-157 is primarily a laboratory test and not a field test. A second purpose is to relate laboratory shrinkage to structure shrinkage. A third purpose is to relate the above shrinkagfe data to the volume change of field concrete which is also significantly influenced by ambient conditions.