Title:
Shrinkage of Concrete with High Volume-to-Surface Ratio in Dry Environment
Author(s):
Jamin Park, Oh-Sung Kwon, and Evan C. Bentz
Publication:
Materials Journal
Volume:
121
Issue:
4
Appears on pages(s):
81-90
Keywords:
low-humidity environment; shrinkage; volume-to-surface ratio (V/S)
DOI:
10.14359/51740779
Date:
8/1/2024
Abstract:
Though extensive experimental studies have been conducted
for shrinkage, studies focusing on shrinkage of high volume-to surface ratio (V/S) concrete in low-relative-humidity conditions are
relatively scarce. Accordingly, most shrinkage prediction models
are applicable for relatively medium- to high-humidity conditions
with a V/S of 100 mm (3.9 in.) or less. In this study, to evaluate
the prediction accuracy of current shrinkage prediction models for
conditions with high V/S and low-relative-humidity conditions,
long-term measurements of shrinkage were conducted with 28 rectangular prism-shaped concrete specimens 76.2 x 76.2 x 285 mm
(3.0 x 3.0 x 11.2 in.) or 125 x 125 x 550 mm (4.9 x 4.9 x 21.7 in.)
in size with V/S ranging from 16.8 to 285 mm (0.7 to 11.2 in.). The
results reveal that current shrinkage prediction models, such as the
ACI 209R-92, fib Model Code 2010 (MC2010), B3, and GL2000
models, can significantly underestimate the long-term shrinkage in
relative humidity less than 20%, depending on the V/S. The prediction accuracy of the ACI 209R-92 and fib MC2010 models depends on how model parameters on the member’s geometry, such as the V/S, are determined.