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Title: 231R-10 Report on Early-Age Cracking: Causes, Measurement and Mitigation
Author: ACI Committee 231
Year of Publication: 2010
Number of Pages: 46
This document is: Active
Nonmember Price: $74.50
ACI Member Price: $45.00
Order Code: 23110
Abstract: Click here to view the first two pages of this publication - pdf file format
Early-age cracking is a challenge for the concrete industry. Materials selection, environmental conditions, and field practices all have considerable influence on the propensity for early-age cracking to occur. This document focuses on thermal- and moisture-related deformations; both are materials-related and contribute to early-age cracking. The document provides detailed reviews on the causes of deformation and cracking, test methods for assessing shrinkage and thermal deformation properties, and mitigation strategies for reducing early-age cracking. Keywords: autogenous shrinkage; cracking; early-age; heat of hydration; measurement; mitigation methods; microstructure; shrinkage; shrinkage cracking; sustainability; thermal cracking; thermal properties.
Contents: Chapter 1—Introduction and scope, p. 231R-2 1.1—Introduction 1.2—Scope Chapter 2—Notation and definitions, p. 231R-2 2.1—Notation 2.2—Definitions Chapter 3—Causes of early-age deformation and cracking, p. 231R-3 3.1—Thermal deformation 3.2—Autogenous shrinkage 3.3—Drying shrinkage 3.4—Creep and stress relaxation from deformation restraint 3.5—Mitigation of shrinkage Chapter 4—Test methods and assessment,p. 231R-10 4.1—Introduction 4.2—Shrinkage measurements 4.3—Ring test 4.4—Rigid cracking frames 4.5—Coefficient of thermal expansion (αT) measurement 4.6—Analysis tools assessing stresses and cracking Chapter 5—Shrinkage control, p. 231R-27 5.1—Introduction 5.2—Expansive additives 5.3—Shrinkage-reducing admixtures 5.4—Internal curing Chapter 6—References, p. 231R-39 6.1—Referenced standards and reports 6.2—Cited references
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