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Title:

USING A SINGLE TEST TO DETERMINE SPECIFIC GRAVITY AND ABSORPTION OF AGGREGATE BLENDS

Accession Number:

00983217

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 USA
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Order URL: http://worldcat.org/isbn/0309094690

Abstract:

The ability to measure the specific gravity of an aggregate accurately and consistently is paramount to transportation materials engineers. Current standard test methods (AASHTO T-84 and T-85) typically are not used for routine quality control purposes because of long testing times and questions about variability. Among new techniques developed for measuring specific gravity and absorption is a vacuum-sealing method, which eliminates the need for long soaking periods and for determining aggregate mass in a saturated-surface-dry moisture state. The vacuum-sealing method also has the potential to measure the specific gravity of a blend of aggregates in a single test. Specific gravity and absorption of six coarse and four fine aggregates composed of various mineralogy types were measured by both traditional and vacuum-seal methods. Ten blends, whose gradations generally met Superpave hot-mix asphalt specifications, were created by using various combinations of aggregates and tested in a single vacuum-seal test. Five replicate tests were done on all individual aggregates and blends. Aggregate-blend single-test results (specific gravity and absorption) were compared with values obtained with traditional individual test results and mathematical combinations. The comparisons yielded generally strong correlations among methods, indicating the vacuum-seal procedure has promise as a relatively rapid method for determining specific gravity and absorption in a single test of an aggregate blend. However, some real differences in test values suggest that the vacuum-seal method needs refinement before it can be seamlessly substituted for traditional methods.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1874, Geology and Properties of Earth Materials 2004.

Monograph Accession #:

00983216

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 USA

Authors:

Hall, K D

Pagination:

p. 3-10

Publication Date:

2004

Serial:

Transportation Research Record

Issue Number: 1874
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309094690

Features:

Figures (3) ; Photos (5) ; References (4) ; Tables (5)

Uncontrolled Terms:

Subject Areas:

Geotechnology; Highways; I36: Aggregates

Files:

TRIS, TRB, ATRI

Created Date:

Dec 6 2004 12:00AM

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