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    Relationship of Aggregate Characteristics to the Effect of Water on Bituminous Paving Mixtures

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    This paper reviews some of the literature concerning the adhesion of bituminous materials to aggregates in the presence of water. It deals with the classification of rocks and their mineralogical and chemical composition. The important properties of the aggregates which are believed to affect the water resistance of bituminous-coated aggregates are discussed. In addition to composition, these are surface texture, surface coatings, particle size and surface area, porosity and absorption, chemical reactivity, and surface energy. The significance of these properties is then evaluated in relation to three prevalent theories regarding the water resistance of bituminous-coated aggregates, that is, the chemical reaction theory, the interfacial energy theory, and the mechanical theory. The environment of the aggregate in the pavement is also considered.

    Author Information:

    Rice, JM
    Research and Testing Engineer, National Crushed Stone Assn., Washington, D. C.

    Committee/Subcommittee: D04.22

    DOI: 10.1520/STP39327S