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Title:

EFFECT OF STYRENE-BUTADIENE-STYRENE BLOCK COPOLYMER ON FATIGUE CRACK PROPAGATION BEHAVIOR OF ASPHALT CONCRETE MIXTURES

Accession Number:

00646121

Record Type:

Component

Availability:

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

Abstract:

The effect of styrene-butadiene-styrene (SBS) additive percentage on the fatigue crack propagation behavior of AC-5 asphalt concrete mixture was studied. Beams were prepared from AC-5 asphalt binder containing 6, 10, and 15% SBS by weight. Flexural fatigue tests were conducted on three identical specimens at each additive percentage. Parameters controlling the crack propagation process were evaluated--namely, the energy release rate and the change in work expended on damage formation and history-dependent viscous dissipation processes. The modified crack layer model was used to extract the specific energy of damage characteristic of the mixture's resistance to crack propagation and the dissipative coefficient. It has been found that the 15% SBS mixture displayed superior fracture toughness as reflected in the specific energy of damage and the dissipative coefficient. As the additive percentage was increased, the fracture toughness of the mixture increased. Also, the ultimate strength and modulus increased. Within the range of additive percentage tested it appears that both the polystyrene endblocks and butadiene rubbery midblocks are working together to improve the ultimate strength and fracture toughness of the asphalt concrete mixture. Scanning electron microscope examination revealed an obvious change in the morphology of the fracture surface as the percentage of additive in the binder increased. This change is manifested in ridge formation in the binder-rich areas of the mixture. This change is also indicative of better adhesion between the binder and the aggregate as well as better cohesion within the binder, which in turn contributes to the increased toughness of the asphalt concrete mixture.

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:

Aglan, H
Othman, A
Figueroa, L
Rollings, R

Pagination:

p. 178-186

Publication Date:

1993

Serial:

Transportation Research Record

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

ISBN:

0309055652

Features:

Figures (6) ; Photos (7) ; References (17) ; Tables (1)

Subject Areas:

Highways; Materials; I31: Bituminous Binders and Materials

Files:

TRIS, TRB

Created Date:

Apr 18 1994 12:00AM

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