01081191

Component

http://www.trb.org/Publications/Blurbs/159352.aspx

Several techniques are available to recover a binder from a bitumen emulsion for further characterization. Some of these consist of allowing a thin film of emulsion to stand in an oven at a given temperature; other methods consist of heating the emulsion, and then the residual binder, under various conditions. Processes which enable the recovery of the binder without changing its characteristics are especially useful when performing an assessment study, during which it is often necessary to determine the characteristics of the binder before emulsification. Furthermore, as regards latex emulsions, these techniques represent the only method to yield young age-modified binder properties. As latex is incorporated in the aqueous phase of the emulsion, the modified binder is formed only after the emulsion breaks. This study was carried out in the laboratory, on “reference” emulsions: pure bitumen, fluxed bitumen, styrene-butadiene-styrene (SBS)-modified binder and latex emulsion. For each emulsion, the binder was recovered using the various techniques above, and then characterized. These various methods have been evaluated and classified according to their influence on binder characteristics. One of the processes proved to be especially interesting. It consists of breaking the emulsion by the addition of ethanol and then allowing the recovered binder to dry in an oven. This study showed that the various recovery methods yield binder representing several states of aging: “recovered” binder, whose characteristics are near those of the binder before emulsification; “stabilized” binder, where the binder aging simulates a 6- to-12-month aging period; and “aged” binder, where the simulated aging represents several years of aging.

01081184

English

pp 1-10

2007-10

Transportation Research Circular

Web

Figures (1) ; Photos (1) ; References (2) ; Tables (2)

Aging (Materials); Asphalt emulsions; Bituminous binders; Ethanol; Latex; Life cycle analysis; Oven drying; Procedures

Binder recovery

Administration and Management; Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB

Nov 20 2007 11:40AM

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