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Publication Number:  FHWA-HRT-06-079    Date:  August 2006
Publication Number: FHWA-HRT-06-079
Date: August 2006


Identifying Incompatible Combinations of Concrete Materials: Volume I—Final Report

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Unexpected interactions between otherwise acceptable ingredients in portland cement concrete are becoming increasingly common as cementitious systems become more and more complex and demands on the systems are more rigorous. Such incompatibilities are exhibited as early stiffening or excessive retardation, potential for uncontrolled early-age cracking, and unstable or unacceptable air void systems.

Based on the experimental work described in this volume, a protocol has been developed to allow product manufacturers, concrete producers, contractors and owners to monitor their materials and concrete systems. The protocol is phased to allow relatively simple field tests to provide early warnings of potential problems, and central laboratory tests to support and confirm the field work. Tests conducted before beginning construction allows users to plan for changes in materials and environment. By monitoring materials with relatively simple field tests during construction, the users can detect when significant changes have occurred, indicating potential construction problems.

Gary Henderson
Director, Office of Infrastructure
Research and Development


This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document. This report does not constitute a standard, specification, or regulation.

The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names appear in this report only because they are considered essential to the objective of the document.


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