Research on Relationship between Gradation Type and Segregation Degree of Asphalt Mixture

In order to investigate the relationship between the type of gradation and the degree of segregation of asphalt mixture, five kinds of gradations were employed based on the design gradation of the asphalt pavement in an expressway. By detecting the spot gradations, texture depths, and densities of the mixture in different positions on the asphalt pavement, the degree of segregation in the process of construction could be determined. It was found that the mixtures with S type gradation or micro-arch type above the maximum density curve can assure stability in the production and transportation. Mixtures with maximum density curve changed in production and transportation, but not in the construction. For gap-graded gradation, the mixture's gradation curve scatters a not in the construction. For mixtures with Reserve-S type, the pavement's uniformity changes obviously in the construction. For mixtures with micro-arch type below the maximum density curve, the gradation provides better stability and the pavement uniformity is good.

並列關鍵字

Asphalt mixture ； Fractal dimension ； Gradation ； Highway engineering ； Segregation

國際替代計量

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