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Title:

DENSITY OF ASPHALT CONCRETE--HOW MUCH IS NEEDED?

Accession Number:

00605671

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309050596

Abstract:

Density is one of the most important parameters in construction of asphalt mixtures. A mixture that is properly designed and compacted will contain the optimum amount of air voids. Because density of an asphalt mixture varies throughout its life, the voids must be low enough initially to prevent permeability of air and water and high enough after a few years of traffic to prevent rutting caused by plastic flow. There are three primary methods of specifying density: (a) percent of control strip, (b) percent of laboratory density, and (c) percent of theoretical maximum density (TMD). If used correctly, all three methods can result in satisfactory compaction. The initial in-place air voids must be below approximately 8% and are determined by comparing bulk density and TMD. The final in-place air voids, which must be above approximately 3%, are estimated by comparing the bulk density of laboratory-compacted samples and the TMD. The two methods that have been used to measure bulk density of asphalt mixture are physical measurements of cores and use of the nuclear gauge. The nuclear gauge is fast and nondestructive but is not as accurate as the core method.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1282, Transportation Construction 1990. 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 Accession #:

01411066

Authors:

Brown, E R

Pagination:

p. 27-32

Publication Date:

1990

Serial:

Transportation Research Record

Issue Number: 1282
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309050596

Features:

Figures (5) ; References (8) ; Tables (1)

Old TRIS Terms:

Subject Areas:

Highways; Materials; I31: Bituminous Binders and Materials

Files:

TRIS, TRB, ATRI

Created Date:

Mar 31 1991 12:00AM

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