01515154

Component

With the adoption of the Superpave mix design method, hot mix asphalt (HMA) pavements have been produced with coarser gradations than previously used mix designs. These coarser gradations have been successful at limiting distresses such as rutting; but, also led to other issues namely higher permeability. Previous research found that air void content, nominal maximum aggregate size (NMAS) and aggregate gradation affect the permeability of HMA mixtures significantly. To better understand the relationships between those influential factors and permeability, Superpave Gyratory Compacted specimens were prepared for laboratory permeability tests following Florida Method 5-565. Testing results confirmed partially the literature review, increases in air voids content and NMAS resulting higher permeability value of HMA mixtures. However, coarse versus fine gradation, defined by the primary control sieve, was not identified as a significant factor. An experimental model was developed to predict permeability as a function of air voids and NMAS.

This paper was sponsored by TRB committee AFK50 Characteristics of Asphalt Paving Mixtures to Meet Structural Requirements.

01503729

14-2881

English

18p

2014

Transportation Research Board 93rd Annual Meeting

Digital/other

Figures; References; Tables

Aggregate gradation; Air voids; Asphalt mixtures; Hot mix asphalt; Mix design; Permeability; Rutting; Superpave

Nominal maximum aggregate size

Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways

Transportation Research Board Annual Meeting 2014 Paper #14-2881

TRIS, TRB, ATRI

Jan 27 2014 2:59PM