Title:
Advanced Assessment of Cracking due to Heat of Hydration and Internal Restraint
Author(s):
Se-Jin Jeon
Publication:
Materials Journal
Volume:
105
Issue:
4
Appears on pages(s):
325-333
Keywords:
crack; heat of hydration; internal restraint; temperature; thermal stress
DOI:
10.14359/19893
Date:
7/1/2008
Abstract:
The control of temperature difference across a section is an effective strategy to minimize hydration-heat-induced cracking in structures where internal restraint is dominant. Some related provisions, however, tend to overestimate the probability of crack occurrence compared with construction experience of real structures. The background of the provisions was investigated to examine the validity of the equations. It was found that they were based on a simple elastic model in which the change of elastic modulus at early ages was not considered. An advanced assessment strategy is proposed that takes into account the hypoelastic model that can incorporate an incremental constitutive equation. The reasonable form of the crack prediction equations with regard to the heat of hydration and internal restraint is discussed considering various mixtures and construction conditions. In addition, a predictive equation for the temperature difference is proposed using the equivalent thickness concept as affected by the curing condition and ambient temperature.