it-099 沥青添加剂的检测.pdf

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