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Idaho Standards 520.00
Idaho Standard Method of Test for
Detection of Anti-Stripping Additive in Asphalt
Idaho IT-99-08
1 Scope
1.1 This method covers field procedures for verifying the presence of anti-stripping additive in
asphalt. This test is qualitative only and does not indicate percentage of anti-strip.
2 Summary and Significance of Method
2.1 A small amount of asphalt is heated in a solution of Isopropyl Alcohol. The decanted alcohol is
tested with an indicator of Bromophenol Blue. A visual color change indicates the presence of
anti-stripping additive of organic compounds classified as amines. Use only clean containers and
fresh chemical solutions, since water and other contaminants may cause a misleading color
change.
3 Apparatus
3.1 Stove or hotplate.
3.2 Glass beakers of approximately 1.7-oz. (50 ml) capacity or disposable aluminum cups of
approximately 4-oz. (120 ml) capacity.
3.3 Glass stirring rods or new disposable wooden stirring sticks approximately 6 in. (150 mm) long.
4 Reagents
4.1 Reagent Grade Isopropyl Alcohol (99.7% water free, minimum), a flammable solvent.
Do not store alcohol in any other bottles or cans – keep in the original container. Do not
pour unused alcohol back into the original container.
4.2 Bromophenol Blue Indicator having a concentration of 0.2% in Isopropyl Alcohol (99.99% water
free). The indicator, a flammable solution, should be a clear, orange color and not more than two
(2) years old. The indicator and alcohol can be obtained from the Central Materials Laboratory.
5 Sample
5.1 The test sample should be taken in accordance with the sampling methods described in AASHTO
T 40. However, a small, quick sample may be obtain
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