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Title:

EFFECT OF AGGREGATE GRADATION ON MEASURED ASPHALT CONTENT

Accession Number:

00646103

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309055652

Abstract:

It is necessary to closely control the asphalt content in hot-mix asphalt (HMA) mixes to obtain optimum serviceability and durability. However, coarser mixes (binder and base courses) made with larger maximum particle-sized aggregate tend to segregate. The resulting variation in the aggregate gradation of the sampled HMA mix can significantly affect the measured asphalt content. A study was done to evaluate the effect of aggregate gradation on the measured asphalt content. Actual mix composition (asphalt content and gradation) data from a major Interstate paving project were obtained and analyzed. A total of 547 binder course and 147 wearing course mix samples were obtained behind the paver and subjected to extraction analysis. A substantial amount of segregation was observed in the binder course mix, which provided the opportunity to correlate the aggregate gradation with the measured asphalt content. Some of the deviation in the measured asphalt content of the binder course mixes from the job mix formula (JMF) was determined to be the result of the change in gradation of the mix from JMF. The percentages of material passing the 4.75-mm (No. 4) and 2.36-mm (No. 8) sieves are correlated with measured asphalt contents. For segregated binder course mixes, equations were developed to adjust the measured asphalt content to account for the change in gradation from the JMF as measured on the 12.5-mm (1/2-in.) and either 4.75-mm (No. 4) or 2.36-mm (No. 8) sieves.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1417, Asphalt Concrete Mixtures. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Title:

Asphalt concrete mixtures

Monograph Accession #:

01398728

Language:

English

Authors:

Kandhal, Prithvi S
Cross, Stephen A

Pagination:

p. 21-28

Publication Date:

1993

Serial:

Transportation Research Record

Issue Number: 1417
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309055652

Features:

Figures (9) ; References (3) ; Tables (8)

Old TRIS Terms:

Subject Areas:

Highways; Materials; I31: Bituminous Binders and Materials

Files:

TRIS, TRB

Created Date:

Apr 18 1994 12:00AM

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