Title:
Effect of Specimen Size and Shape on Drying Shrinkage of Concrete
Author(s):
Jamal A. Almudaiheem and Will Hansen
Publication:
Materials Journal
Volume:
84
Issue:
2
Appears on pages(s):
130-135
Keywords:
cement pastes; concretes; drying shrinkage; mortars (material); research; shape factor; shrinkage; specimens; Materials Research
DOI:
10.14359/1860
Date:
3/1/1987
Abstract:
The effects of specimen size and shape on development of drying shrinkage over time and ultimate drying shrinkage of 0.4 water-cement ratio paste, mortar, and concrete were investigated. The specimen covered volume-to-surface (V/S) ratios of 0.05 to 0.75 in. For each system a unique relationship between drying shrinkage and weight loss was obtained independent of V/S ratio. This suggests that ultimate drying shrinkage of a structural member may be estimated from the development of drying shrinkage over time of a miniature concrete specimen of the same mix composition. The effect of member size and shape on the development of drying shrinkage over time can be predicted with good accuracy using a modified Ross equation. This expression, which is empirical, includes a shrinkage half-time coefficient N, that was estimated for concrete specimens of V/S ratios up to 6 in. by including long-term shrinkage results from the literature. This coefficient was found to be linearly proportional to the V/S ratio on a semilogarithmic scale.