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Title: Best Practices for Polyphosphoric Acid Modification of Asphalt: Phosphate Forum of the Americas
Accession Number: 01363329
Record Type: Component
Availability: Find a library where document is available Abstract: Polyphosphoric acid (PPA) has been proven as a successful modifier for asphalt concrete (AC) either by itself or in combination with polymers. On its own, PPA increases the high-temperature performance of AC, as measured by the performance grade (PG) system, with no loss, and sometimes with an improvement, in low-temperature performance. In combination with polymers, PPA has shown its ability to use styrene-butadiene-styrene (SBS) polymers more efficiently, either by providing a product with superior properties at equal polymer loadings, or an equivalent product at lower polymer levels. In many instances, the use of PPA in combination with SBS gives rise to enhanced performance that could not be achieved with either product alone. In combination with ethylene terpolymers such as DuPont’s Elvaloy, the use of PPA accelerates the reaction of the Elvaloy, broadens the useful temperature range of the finished product, and improves the elastic response of the binder. In addition, PPA also allows the reaction of Elvaloy and asphalt to proceed at lower temperatures. This document provides general guidelines for the selection and use of PPA in asphalt modification. Testing is required to demonstrate the performance of each formulation of asphalt, polymer (if any), PPA, antistrip (if any), and aggregate.
Supplemental Notes: This paper was prepared by the Polyphosphoric Acid (PPA) Subcommittee of the Phosphate
Forum of the Americas (PFA). PFA provides a forum for information exchange on scientific
and technical matters relating to inorganic phosphate products. Members of the PPA
Subcommittee are ICL Performance Products LP and Innophos, Inc., companies that make
purified PPA, which is used as an asphalt binder modifier for asphalt roads.
Monograph Title: Monograph Accession #: 01363314
Language: English
Pagination: pp 131-135
Publication Date: 2012-1
Serial: Conference:
Workshop on Polyphosphoric Acid Modification of Asphalt Binders
Location:
Minneapolis Minnesota, United States Media Type: Digital/other
TRT Terms: Identifier Terms: Uncontrolled Terms: Subject Areas: Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials
Files: TRIS, TRB
Created Date: Feb 23 2012 1:22PM
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