Laboratory study of large stone asphalt mixtures

Document Type

Article

Publication Date

12-1-2000

Abstract

Large stone asphalt mixtures (LSAM) generally refer to hot mix asphalt mixtures with nominal aggregate sizes greater than 25 mm. An open-graded LSAM, and a 37.5 mm Superpave mix were designed based on both volumetric properties and engineering performance tests. Both mixtures were compared to their corresponding conventional Louisiana Type 508 drainable base mix and Type 5A base mix, respectively, through laboratory performance tests. The open-graded LSAM showed better rut-resistance and durability than the conventional Type 508 drainable base mix while still maintaining permeability. The 37.5 in. Superpave base mix showed improved performance and similar performance as measured from the axial creep test and from the other performance tests, respectively when compared to the conventional Type 5A base mix. The open-graded large stone asphalt mixture and conventional Type 508 drainable mixture had draindown values of less than 0.3%. Thus, draindown was not expected to be a problem for these mixtures during construction.

Publication Source (Journal or Book title)

Proceedings of the Association of Asphalt Paving Technologists

First Page

122

Last Page

147

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