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Title: Use of Phosphoric Acid as Modifier for Hot-Mix Asphalt
Accession Number: 01363322
Record Type: Component
Availability: Find a library where document is available Abstract: The use of polyphosphoric acid (PPA) to stiffen paving asphalt has become quite ubiquitous. Recently, several premature paving failures have been attributed to its usage; however much of this has been based on incomplete information or speculation. Subsequently this has created uncertainty regarding hidden pitfalls surrounding its use. The primary concerns are the effect of different grades of phosphoric acid, the reactivity of asphalts from different sources and whether PPA accelerates aging, or increases the moisture sensitivity of binders. This paper discusses research conducted to address many of these issues. Data are presented to show the effect of increasing levels of acid modification on moisture sensitivity. Both the absorption of moisture into the binder and mastic samples were examined. Preconceived notions about the use of phosphoric acid with alkaline antistrip additives are also addressed. Use with antistrip additives is perfectly feasible if the proper screening tests are conducted before use.
Monograph Title: Monograph Accession #: 01363314
Language: English
Authors: Arnold, Terry SYoutcheff, JackNeedham, Susan PPagination: pp 40-51
Publication Date: 2012-1
Serial: Conference:
Workshop on Polyphosphoric Acid Modification of Asphalt Binders
Location:
Minneapolis Minnesota, United States Media Type: Digital/other
Features: Figures; References; Tables
TRT 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 9:17AM
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