Welcome to the 201 Series!

EVALUATION OF SUPERPAVE AGGREGATE SPECIFICATIONS

 The comprehensive research program was conducted in three concurrent phases which examined the Superpave fine aggregate angularity (FAA) test, the restricted zone requirement, and the voids in the mineral (VMA) specification.

Focusing on the specifications for fine aggregate angularity (FAA) and the restricted zone, this project determined the effects of these criteria on the properties and performance of asphalt mix designs. Using different aggregates, with a known proven performer as a control, mixes above, below and through the restricted zone were evaluated for rutting characteristics. Fine aggregates were collected from 25 state DOTs, representing a wide range of FAA value and know (subjective) performance. They were evaluated, using several techniques, for angularity, surface texture and aspect ratios. Results show that the Compacted Aggregate Resistance Test shows better sensitivity to fine aggregate angularity than the current voids test. Other techniques were also evaluated. Results show that the Superpave Restricted Zone is not needed to control gradation. The finding correlates well with other studies.

As a result of this study several reports were written. In this 201 series you will find the following reports: 

201-1, “Evaluation of Superpave Fine Aggregate Angularity Specification,” Arif Chowdhury, Joe Button, Vipin Kohle and David Jahn.

201-2, “Effects of Superpave Restricted Zone on Permanent Deformation,” Arif Chowdhury, Joe Button, and Jose Grau.

201-3F, “Effects of Aggregate Gradation and Angularity on VMA and Rutting Resistance,” Dae-Wook Park, Arif Chowdhury, and Joe Button.

Please click on the above references to go to the individual reports.