Title: Shrinkage of Concrete with High Volume-to-Surface Ratio in a Dry Environment

Author(s): Jamin Park, Oh-Sung Kwon, Evan C. Bentz

Publication: Materials Journal

Volume:

Issue:

Appears on pages(s):

Keywords: low humidity environment; shrinkage; volume-to-surface ratio

DOI: 10.14359/51740779

Date: 5/1/2024

Abstract:
Though extensive experimental studies have been conducted for shrinkage, studies focusing on shrinkage of high volume-to-surface (V/S) ratio 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 ratio 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 ratio and low relative humidity conditions, long-term measurements of shrinkage were conducted with 28 rectangular prism-shaped concrete specimens of 76.2 × 76.2 × 285 mm (3.0 × 3.0 × 11.2 in.) or 125 × 125 × 550 mm (4.9 × 4.9 × 21.7 in.) in size with V/S ratio ranging from 16.8 to 285 mm (0.7 to 11.2 in.). The results reveal that current shrinkage prediction models, such as ACI 209R-92, fib MC2010, B3, and GL2000 models, can significantly underestimate the long-term shrinkage in relative humidity less than 20% depending on the V/S ratio. The prediction accuracy of ACI 209R-92 and fib MC2010 model depends on how model parameters on member’s geometry such as V/S ratio are determined.