AASHTO T 377-17
- Standard Method of Test for Detecting the Presence of Phosphorous in Asphalt Binder
- standard by American Association of State and Highway Transporta
- Category: AASHTO
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AASHTO T 377-17 qualitative test method can be used to identify the presence of polyphosphoric acid (PPA) inasphalt binder or residue. If PPA is present in the binder, a blue color is developed inapproximately 5 min. The test method is not quantitative, but it can detect PPA at concentrationsas low as 0.1 percent. The test method can only determine the presence of phosphorus. It is notspecific 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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