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This research was based on a two-part basic research investigation studying the effects of cement paste-aggregate interfaces (or interfacial transition zones - ITZ) on strength and durability of concrete. Part I dealt with the theoretical study and Part II dealt with the experimental. This report, Part I, the theoretical part, illustrates the effect of ITZ on the concrete properties by assuming its elastic moduli to be varied continuously in the region. A four-phase composite model is employed and three functions are chosen to model the moduli variation in the ITZ. A theoretical solution for an n-layered spherical inclusion model is used to estimate the overall effective moduli of the modified four-phase model. The influence of material and geometric characteristics of the ITZ, as well as that of the aggregate on the overall effective moduli is investigated. The effects of three different moduli variations in ITZ on the overall moduli are compared. Their potential application is discussed. Finally, by comparing the prediction of the proposed models to a set of data on mortar, it is found that the elastic modulus at the interface is about 20-70% lower than that in the bulk paste for portland cement mortar, and 10-40% lower for silica fume mortar.

Strength and Durability of Concrete: Effects of Cement Paste-Aggregate Interfaces, Part I: Theoretical Study on Influence of Interfacial Transition Zone on Properties of Concrete Materials