Effect of Aggregate on Shrinkage of Concrete and a Hypothesis Concerning Shrinkage

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Title: Effect of Aggregate on Shrinkage of Concrete and a Hypothesis Concerning Shrinkage

Author(s): Gerald Pickett

Publication: Journal Proceedings

Volume: 52

Issue: 1

Appears on pages(s): 581-590

Keywords: no keywords

Date: 1/1/1956

Abstract:
A theoretical formula is derived for effect of aggregate on shrinkage of con-crete during drying. Experiments designed to test the validity of the formula are reported. In addition to indicating the validity of the formula, the data give the following indicbations: (1) First shrinkage is greater than any subsequent expansion or shrinkage resulting from moisture change. (2) At a given aggregate content the shrinkage is approximately proportional to water-cement ratio. (9) After first shrinkage, subsequent volume changes are approximately independent of water-cement ratio. (4) When shrinkages of specimens of the higher water-cement ratio are plotted against the square root of period of drying, the shapes of the curves for second shrinkage are appreciably different from those for first shrinkage in that they have considerable curvature near the origin. An explanation of these effects is given.