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A Study on Aggregate Gradation of 10 mm Dense-graded Asphalt Mixture using Slag Aggregate
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 Title & Authors
A Study on Aggregate Gradation of 10 mm Dense-graded Asphalt Mixture using Slag Aggregate
Jo, Shin Haeng; Kim, Kyungnam; Kim, Nakseok;
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The purpose of this paper is to suggest 10 mm aggregate specification for thin layer asphalt pavement using steel slag. Aggregate gradations of conventional dense-graded asphalt mixtures were made by fuller's model, whereas 10 mm dense-graded asphalt mixture was obtained tender mix due to close to the maximum density line. The proposed aggregate gradation specification was made to have enough VMA and well-interlocking refer to foreign standards. The correlation between the proposed aggregate gradation and the properties of mixtures were analyzed using Gradation Ratio (GR) and Compacted Aggregate Density (CAD). The CAD index has a high of 0.86-0.99 because the CAD index is able to reflect various aggregate properties. As the results of evaluation by CAD index the proposed aggregate gradation provides more reliable stability and VMA. The percent passing (%) of aggregate size smaller than 0.3 mm was limited 10% or more for improving crack resistance. This limitation increased for 15% of the asphalt mixture's toughness.
Steel slag;Aggregate gradation;Dense-graded asphalt mixture;Gradation ratio(GR);Compacted aggregate density(CAD);
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