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Title:

LABORATORY AGING AND ANNEALING OF ASPHALT BINDERS BY MICROWAVE RADIATION

Accession Number:

00730238

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309059100

Abstract:

A household microwave oven with a frequency of 2,450+/-13 MHz and an output power of 1000 W is used to simulate short- and long-term aging of asphalt, and for annealing, prior to sampling, to remove steric (isothermal) hardening. A quartz petri dish holds the asphalt during microwave treatment, at atmospheric pressure. To simulate thin film oven (TFO) aging, a 10-g sample is microwaved for a total of 33 min. For 11 asphalts, the average difference in G*/sin delta, at limiting high temperature, between TFO and microwave aging is +/-0.68 kPa. Simulating rolling thin-film oven (RTFO) aging is possible by microwaving for a total of 63 min. For 18 asphalts, the average difference in G*/sin delta, at limiting high temperature, between RTFO and microwave aging is +/-1.19 kPa. Aging by RTFO + pressure aging vessel (PAV) and TFO + PAV is simulated by microwaving for a total of 158 min. Microwave aging marginally underestimates long-term aging. For 18 asphalts, the average difference in intermediate temperature obtained after RTFO + PAV versus microwave aging is -2.8 deg C; for TFO + PAV versus microwave aging, the average difference is -2.7 deg C. Annealing for 2 hr at 150 deg C in a convection oven (conductive heating) is simulated by microwaving for a total of 27 min. The average difference in G*/sin delta between the two methods is +/-0.24 kPa. Molecular size index (MSI, the ratio of first to second fraction from size exclusion chromatography) correlates with stiffness at low temperature. At intermediate temperature, tan delta remains practically unchanged until MSI reaches a minimum, then increases sharply. At limiting high temperature, G* does not correlate with MSI.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1535, Characteristics of Asphalt Binders.

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Bishara, Safwat W
McReynolds, R L

Pagination:

p. 98-107

Publication Date:

1996

Serial:

Transportation Research Record

Issue Number: 1535
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309059100

Features:

Figures (2) ; References (9) ; Tables (14)

Uncontrolled Terms:

Microwave ovens

Old TRIS Terms:

Subject Areas:

Highways; Materials; I31: Bituminous Binders and Materials

Files:

TRIS, TRB

Created Date:

Dec 13 1997 12:00AM

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