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Uncompacted voids and particle index tests for evaluating coarse aggregate Hossain, M Shabbir ; Parker, Frazier Jr ; Kandhal, Prithvi S

By: Contributor(s): Publication details: Transportation Research Record, 2000Description: nr 1721, s. 100-5Subject(s): Bibl.nr: VTI P8167:1721Location: Abstract: Coarse-aggregate angularity and surface texture are properties specified under the Superpave mix design system. To control specification requirements, the fractured-face count test is suggested. The use of a more objective test was investigated. Uncompacted voids and index of aggregate particle shape and texture tests were studied to measure coarse-aggregate angularity. The gradation of the sample has an obvious influence on both test results. Ways to separate the effect of gradation from aggregate angularity were studied. Viable options include testing a standard graded sample and computing a weighted average from tests of individual size fractions based on the gradation of the blend. When comparing aggregate sources, either option produces a comparable evaluation, but testing standard graded samples saves time. On the other hand, the weighted average is more appropriate for evaluating an aggregate blend. The index of aggregate particle shape and texture test and the uncompacted voids test provide comparable measures of coarse aggregate angularity and surface texture.
Item type: Reports, conferences, monographs
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Coarse-aggregate angularity and surface texture are properties specified under the Superpave mix design system. To control specification requirements, the fractured-face count test is suggested. The use of a more objective test was investigated. Uncompacted voids and index of aggregate particle shape and texture tests were studied to measure coarse-aggregate angularity. The gradation of the sample has an obvious influence on both test results. Ways to separate the effect of gradation from aggregate angularity were studied. Viable options include testing a standard graded sample and computing a weighted average from tests of individual size fractions based on the gradation of the blend. When comparing aggregate sources, either option produces a comparable evaluation, but testing standard graded samples saves time. On the other hand, the weighted average is more appropriate for evaluating an aggregate blend. The index of aggregate particle shape and texture test and the uncompacted voids test provide comparable measures of coarse aggregate angularity and surface texture.

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