231R-10 Report on Early-Age Cracking: Causes, Measurement and Mitigation

231R-10 Report on Early-Age Cracking: Causes, Measurement and Mitigation

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Description

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.

 

Document Details

Author: ACI Committee 231

Publication Year: 2010

Pages: 46.00

ISBN: 9780870313592

Categories: Cracking

Formats: PDF

Table of Contents

Chapter 1—Introduction and scope

1.1—Introduction

1.2—Scope

Chapter 2—Notation and definitions

2.1—Notation

2.2—Definitions

Chapter 3—Causes of early-age deformation and cracking

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

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

5.1—Introduction

5.2—Expansive additives

5.3—Shrinkage-reducing admixtures

5.4—Internal curing

Chapter 6—References

6.1—Referenced standards and reports

6.2—Cited references

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