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Title:

PREDICTION OF ASPHALT CEMENT CONTENT OF COMPACTED HOT-MIX ASPHALT SPECIMENS USING NUCLEAR GAUGES

Accession Number:

00731122

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/030905916X

Abstract:

Determining asphalt cement (AC) content of hot-mix asphalt (HMA) for quality control/quality assurance using extraction methods is a lengthy, time-consuming, and hazardous process. A demand for a faster and safer method led to the development of different nuclear gauges capable of predicting the AC content of HMA samples. Measuring the AC content of compacted specimens by nuclear gauges is a new technique whose feasibility was evaluated. A total of 216 Marshall compacted specimens were cast and tested in an attempt to develop correction models. The study program investigated the effect of various HMA parameters on the measured AC content, including aggregate gradation and type, air void content, moisture content, and specimen weight. Specimens were prepared at two different mix design formulas using AC-30 and compacted at two different compaction efforts to investigate the effect of air voids. Specimens (1200 g each) used for calibration were prepared at 3 to 7% AC content, whereas specimens prepared for measurements were prepared at 4 to 6%. Quartzite and diabase aggregate were used as open and dense graded in prepared mixes. Three levels of moisture content in HMA were evaluated. Different calibration models were developed for different asphaltic mixtures. The evaluated nuclear gauge for measuring AC content for compacted HMA specimens produced satisfactory results when the parameters of tested specimens and calibration specimens were the same. The study found that specimen weight is the most significant factor. Other parameters have different degrees of influence on the measured AC content. Statistical models were developed to correct for the evaluated parameters.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1545, Asphalt Pavement Surfaces and Asphalt Mixtures.

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Alattar, I A
Al-Qadi, I L

Pagination:

p. 169-177

Publication Date:

1996

Serial:

Transportation Research Record

Issue Number: 1545
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

030905916X

Features:

Figures (8) ; References (5) ; Tables (4)

Old TRIS Terms:

Subject Areas:

Data and Information Technology; Highways; Materials; I31: Bituminous Binders and Materials

Files:

TRIS, TRB

Created Date:

Feb 3 1997 12:00AM

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