Details:

Creators:
Carter, Chester B. ; Prowell, Brian D
Carter, Chester B. ; Prowell, Brian D Less -
Corporate Creators:
Virginia Transportation Research Council (VTRC)
Subject/TRT Terms:
[+]
Aggregate Gradation Aggregate Mixtures Aggregates Asphalt Content Asphalt Ex Ignition Furnace Mix Design Quality Assurance Recycled Materials Sand Equivalent Test Specific Gravity Superpave
Publication/ Report Number:
VTRC 00-IR1
Resource Type:
Research Paper
Geographical Coverage:
Virginia
Edition:
Interim report. 7/98-4/00
Corporate Publisher:
Virginia Transportation Research Council (VTRC)
Abstract:
The Superpave mix design system includes four consensus aggregate properties to ensure aggregate quality: coarse aggregate angularity, flat and elongated particles, fine aggregate angularity, and sand equivalent. In addition to determining these consensus aggregate properties, ascertaining aggregate gradations and specific gravities are also required to complete an optimal mix design. A method of extracting the asphalt from recycled asphalt pavement (or from quality control/quality assurance samples) that would produce a clean aggregate sample for analysis was needed. The Virginia Department of Transportation (VDOT) has used the ignition method for determining asphalt content and for the recovery of aggregates for gradation analysis since 1995. This study evaluated the effect on aggregate properties of samples extracted using the ignition furnace. For the purposes of the study, recycled asphalt pavement was artificially produced by mixing virgin aggregates with asphalt and aging the mixture prior to extraction in the ignition furnace. Consensus aggregate properties, specific gravity tests, and gradation analysis were performed on three replicates each of the virgin and recovered aggregates. Only the sand equivalent test and aggregate-specific gravities showed regular significant differences. It was found that the specific gravity values measured for aggregates recovered using the ignition furnace were closer to the measured values for the virgin aggregates than the effect specific gravity method which has been traditionally used for estimating a bulk gravity for recycled asphalt pavement. As a result of this study, recommendations were made to the VDOT to change testing requirements on recycled asphalt pavement.
Format:
PDF
Funding:
00050297
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:39557df1bdd4a30b055d252ea1c779a81554f56a4bb766739d5c329a31c884d1
Download URL:
https://rosap.ntl.bts.gov/view/dot/14270/dot_14270_DS1.pdf
File Type:

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