Effect of warm mix additives and dispersants on asphalt rheological, aging, and failure properties

► Warm mix additives can potentially increase pavement cracking. ► Paraffin inhibitors can potentially reduce thermal cracking. ► Effects are not easily predictable and hence best evaluated through improved performance testing. Warm mix additives, asphaltene dispersants, and other chemical modifiers...

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Bibliographic Details
Published in:Construction & building materials 2012-12, Vol.37, p.493-498
Main Authors: Ahmed, Eman I., Hesp, Simon A.M., Paul Samy, Senthil Kumar, Rubab, Syed D., Warburton, George
Format: Article
Language:English
Subjects:
Analysis
Asphalt cement
Asphaltene dispersants
Chemical hardening
Chemical properties
Ductile failure
Fatigue
Fatigue testing machines
Materials
Mechanical properties
Physical hardening
Rheology
Warm mix additives
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Summary:► Warm mix additives can potentially increase pavement cracking. ► Paraffin inhibitors can potentially reduce thermal cracking. ► Effects are not easily predictable and hence best evaluated through improved performance testing. Warm mix additives, asphaltene dispersants, and other chemical modifiers are regularly added to asphalt to improve workability during construction, to increase the useful temperature interval in service, or to impart other benefits such as enhanced resistance to chemical aging or moisture damage. There is a scarcity of information on how most of these additives affect durability. This report discusses how commercial and developmental additives affect low strain rheological and high strain failure characteristics. It was found that several modifiers significantly changed both rheological and failure properties. Hence, care is warranted in order to assure an overall benefit from such technologies.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2012.07.091