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- W629908084 abstract "To achieve maximum resistance to shear stresses and rutting in asphalt mixtures, a better understanding is required of the relationships between aggregate gradation and the shear resistance and volumetric properties of asphalt mixtures. Laboratory tests were performed on mixtures produced with 18 coarse aggregate (>2.0mm) gradations ranging from a Stone Matrix Asphalt (SMA) mixture to a gradation corresponding to the maximum density line. Gyratory shear (Gs) measurements indicated that mixutre shear resistance was most strongly related to the gradation of the coarse aggregate fraction (>2.0mm) of the mixtures evaluated. Coarseness, shape, and position of the gradation curve relative to the maximum density line were all found to influence mixture shear resistance. The voids in the mineral aggregate (VMA) of the mixture or of the coarse aggregate fraction were not found to be related to shear resistance. It was also found that optimal gradations can be achieved that result in shear resistances equal to or greater than those of SMA mixtures, yet the mixtures were dense enough to possibly not require polymers and/or fibers to prevent draindown. Mixtures including both coarse and fine aggregate fractions substantiated the results of tests performed on coarse aggregate only. In other words, the coarse aggregate gradation controlled the shear resistance of the mixtures even when the fine aggregate dilated the coarse aggregate structure. For the covering abstract of this conference, see IRRD number 872672. (A)" @default.
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- W629908084 date "1995-01-01" @default.
- W629908084 modified "2023-09-23" @default.
- W629908084 title "OPTIMIZING AGGREGATE GRADATION TO MAXIMIZE SHEAR RESISTANCE OF ASPHALTIC MIXTURES" @default.
- W629908084 hasPublicationYear "1995" @default.
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