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Title:

Emulsion Residue Recovery Techniques: How Do We Get Emulsion Residue Representative of In-Service Binder?
Cover of Emulsion Residue Recovery Techniques: How Do We Get Emulsion Residue Representative of In-Service Binder?

Accession Number:

01081219

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/00978515

Abstract:

ASTM and AASHTO have specifications for emulsified asphalt (D977, M140) and cationic-emulsified asphalt (D2397, M208), but not for polymer-modified emulsions. These specifications require the distillation test (ASTM D6997) to acquire emulsion residue for further testing. Many makers of polymer-modified emulsions believe the high temperatures seen in the standard distillation test (ASTM D 6997) harm the polymer additives. The producers want any specification for polymer-modified emulsions to show the benefits of their polymer. This requires a residue recovery technique that does not harm polymer modifiers. There is a desire by some [both departments of transportation (DOTs) and producers] to develop more uniform specifications for polymer-modified asphalt emulsions. Some even want to develop more performance-based specifications to apply to all seal coat binders. Both of these require the acceptance of a mechanism of acquiring asphalt emulsion residue that is representative of on-the-road binder. This paper describes an experiment conducted at the Texas Department of Transportation (TxDOT) to compare six asphalt emulsion residue recovery techniques. Emulsion residues were recovered with each technique and tested by Dynamic Shear Rheometer (DSR). The paper describes the test procedures and compares techniques using DSR results. Additionally, it makes comparisons relative to equipment cost, test time, sample volume, binder aging, level of testing effort, and interferences (external factors that can affect testing). Based on this work, the stirred air-flow test (SAFT) appears to produce residue properties that are the most unaffected by the recovery technique. Future work may produce refinements in other techniques to address current perceived deficiencies.

Monograph Accession #:

01081184

Language:

English

Authors:

Hazlett, Darren G

Pagination:

pp 15-23

Publication Date:

2007-10

Serial:

Transportation Research Circular

Issue Number: E-C122
Publisher: Transportation Research Board
ISSN: 0097-8515

Media Type:

Web

Features:

Figures (4) ; References (4) ; Tables (2)

Uncontrolled Terms:

Recovery; Stirred air-flow test

Subject Areas:

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

Files:

TRIS, TRB

Created Date:

Nov 20 2007 12:07PM

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