New Concrete and Asphalt Mixes on the Horizonby Charles R. Marek, Vulcan Materials Co, United States,
Abstract: Significant research is currently 'in progress' which is intended to develop modified or new design methodologies that will result in improved pavement performance. As a consequence of these research efforts, Portland Cement Concrete (PCC) and Hot Mix Asphalt (HMA) pavements, and mixtures used for these pavements, that are constructed during the 21st Century will be significantly different from pavements/mixtures used today. Changes will be made in maximum particle size, percent minus 200, gradation, particle shape of coarse and fine aggregate, filler-to-binder ratio in HMA, and several other factors to improve mixture/pavement performance. Additives/modifiers will be utilized to greater degrees. This paper describes anticipated changes in (1) PCC and HMA pavement systems, (2) portland cement concrete mixtures, and (3) hot mix asphalt mixtures that will be utilized into the 21st Century. Most changes will be implemented in efforts to reduce mixture/ construction life cycle cost, improve mixture control, and improve mixture/pavement performance.
Subject Headings: Concrete pavements | Asphalt pavements | Asphalt concrete | Mixtures | Portland cement | Materials processing | Asphalts | Pavement design
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