Guide to Cold Weather Concreting: Chapter 8 Protection Against Freezing for Structural Concrete-Chapter 8 of ACI 306R-16, Guide to Cold Weather Concreting (PDF)

Chapter 8 of ACI 306R-16, Guide to Cold Weather Concreting (PDF)

Pdf Summary

ACI 306R-10, developed by the ACI Committee 306, focuses on best practices for cold weather concreting, aiming to prevent damage from freezing, ensure proper strength development, and maintain suitable curing conditions. Key objectives include preventing early-age freezing damage, facilitating safe form removal, and achieving normal strength development amid temperature fluctuations.<br /><br />The guide provides strategies for handling concrete temperatures during mixing and placement, protecting it from rapid temperature changes, and adopting curing methods that support strength gain for the intended use of the structure. It offers practical methods for estimating strength development and the necessary measures for concrete that doesn't need construction support as well as structural concrete requiring supports.<br /><br />The document outlines the use of admixtures, including accelerating and antifreeze types, to aid strength development and setting under cold conditions. Additional solutions involve managing concrete temperature losses during delivery, preparing surfaces prior to concreting, and employing protective methods during freezing periods.<br /><br />Crucial recommendations include:<br />- Concrete temperature management during mixing and placement<br />- Utilizing heated enclosures and insulated materials<br />- Conducting maturity testing for accurate strength prediction<br />- Applying methods like internal heating, enclosures, and insulated forms for temperature control<br />- Removing supports only after reaching certain strength criteria as verified by field-cured specimens and in-place testing methods.<br /><br />Chapters cover various aspects, from initial preparation, protection strategies, specific equipment, materials, methods for temperature protection, to curing requirements and acceleration of setting and strength development.<br /><br />This guide is intended for professionals skilled at evaluating and applying these recommendations responsibly, emphasizing the ACI's position that any references to this document in contracts should be explicitly restated in mandatory terms by architects or engineers for contractual incorporation. To access the full document, interested parties are directed to the ACI Store.

Keywords

cold weather concreting

freezing damage prevention

strength development

curing conditions

concrete temperature management

admixtures

maturity testing

temperature control

ACI Committee 306

construction support