Fundamentals of permeability in asphalt mixtures

Document Type

Article

Publication Date

12-1-1999

Abstract

Permeability is an important property of asphalt mixtures. However, there is confusion concerning the measured value of coefficient of permeability obtained from different sources. It is not uncommon that reported values for comparable materials have ≤ 100 times difference. An investigation was carried out at the Louisiana Transportation Research Center to study the drainability of five types of asphalt mixtures used for pavement surface layers and as base course layers. These mixes include a conventional design of Louisiana Type 8 dense-graded mixtures, 19-nm Superpave wearing course mixtures, a traditional open-graded Louisiana Type 501 asphalt treated base mixture, and a newly developed open graded large stone asphalt mixture. A dual mode flexible wall permeameter was developed to measure water permeability or the hydraulic conductivity of asphalt mixtures. The device worked on constant head and falling head principles, and was capable of determining the material hydraulic conductivity when the common Darcy's Law is no longer valid. A statistical model to determine the hydraulic conductivity was developed for the drainable asphalt mixtures.

Publication Source (Journal or Book title)

Proceedings of the Association of Asphalt Paving Technologists

First Page

479

Last Page

500

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