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AASHTO TP 78 PDF download
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Standard Method of Test for Detecting the Presence of Phosphorous in Asphalt Binder
| Published by | Publication Date | Number of Pages |
| AASHTO | 2009 | 4 |
AASHTO TP 78 – Standard Method of Test for Detecting the Presence of Phosphorous in Asphalt Binder
This qualitative test method can be used to identify the presence of polyphosphoric acid (PPA) in asphalt binder or residue. If PPA is present in the binder, a blue color is developed in approximately five minutes. The test method is not quantitative, but it can detect PPA at concentrations as low as 0.1 percent. The test method can only determine the presence of phosphorus. It is not specific for the presence of PPA. A positive test result assumes that the phosphorus is from PPA. Any additive that contains phosphorus will give a false positive for the presence of PPA.
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