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Title:

Sensitivity of Nozzle-Based Foamed Asphalt Binder Characteristics to Foaming Parameters

Accession Number:

01518322

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States
Order URL: http://www.trb.org/Main/Blurbs/171939.aspx

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Order URL: http://worldcat.org/isbn/9780309295369

Abstract:

Foam-based warm-mix asphalt technologies decrease the overall viscosity of the asphalt mixture at lower temperatures so that it is workable during construction. However, after construction, viscosity increases rapidly as the foam disappears and the temperature drops. Although the production of the foamed binder is a relatively simple process, in which hot binder is mixed with a limited amount of water (typically 1% to 3% by weight of the binder), the rheology of the foamed binder is complex. The characteristics of foamed binders depend on various factors such as the binder type, grade, and modification; the foaming technology used; amount of water; and temperature. This study investigated the sensitivity of the characteristics of foamed binders to parameters such as injected air pressure and water content. The foamed binder characteristics, including the expansion ratio, half-life, foam index, bubble size distribution, and surface area index, were measured with a novel automated laboratory device called the asphalt foam collapse test. The measurements were conducted in several conditions, including (a) constant water content and variable air pressure, (b) variable water content and constant air pressure, and (c) variable air pressure and water content. It was concluded that both water content and air pressure significantly affected foamed binder characteristics and their internal morphology.

Monograph Accession #:

01552182

Report/Paper Numbers:

14-3961

Language:

English

Authors:

Ozturk, Hande I
Kutay, M Emin

Pagination:

pp 120–129

Publication Date:

2014

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Issue Number: 2444
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

9780309295369

Media Type:

Print

Features:

Figures (7) ; Photos; References (19) ; Tables (1)

Subject Areas:

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

Files:

TRIS, TRB, ATRI

Created Date:

Jan 27 2014 3:22PM

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