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00806THE INFLUENCE OF CHEMISTRY AND MICROSTRUCTURE ON CORROSION TESTING OF CONCRETE

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Product Number: 51300-00806-SG
ISBN: 00806 2000 CP
Author: Jack Tinnea, J. Francis Young
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This paper discusses the physical and chemical properties of Portland cement that may influence corrosion testing in concrete. Mix design factors, such as water/cement ratio and aggregate proportion, have a large influence on the transport properties of concrete. Heating and drying of the concrete also impacts transport. An introduction to cement hydration products, microstructure, and capillary pore structure is provided. These several threads are brought together into a discussion of how accelerated laboratory techniques may produce results that differ from what may happen in field situations. It is commonplace to neglect the fact that concrete is a composite material and that the cementitious binding matrix is a chemically active component of the system. This neglect can lead to undesirable sample preparation techniques prior to corrosion testing and inappropriate interpretation of test data. It is the purpose of this paper to provide an introductory tutorial on the chemistry and physics of concrete and to highlight particular material behavior and characteristics that can have a profound impact on corrosion testing. It is our hope that this overview will lead to improved testing protocols and more reliable test data.
This paper discusses the physical and chemical properties of Portland cement that may influence corrosion testing in concrete. Mix design factors, such as water/cement ratio and aggregate proportion, have a large influence on the transport properties of concrete. Heating and drying of the concrete also impacts transport. An introduction to cement hydration products, microstructure, and capillary pore structure is provided. These several threads are brought together into a discussion of how accelerated laboratory techniques may produce results that differ from what may happen in field situations. It is commonplace to neglect the fact that concrete is a composite material and that the cementitious binding matrix is a chemically active component of the system. This neglect can lead to undesirable sample preparation techniques prior to corrosion testing and inappropriate interpretation of test data. It is the purpose of this paper to provide an introductory tutorial on the chemistry and physics of concrete and to highlight particular material behavior and characteristics that can have a profound impact on corrosion testing. It is our hope that this overview will lead to improved testing protocols and more reliable test data.
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