AASHTO T 170

Description / Abstract: This method covers the recovery, by the Abson Method, of asphalt binder from a previously conducted extraction with reagent-grade trichloroethylene or reagent-grade methylene chloride (Note 1). The asphalt binder is recovered with properties substantially the same as those it possessed in the asphalt mixture and in quantity sufficient for further testing.

Note 1—Trichloroethylene conforming to ASTM D 4080 or technical grade methylene chloride may be used, but it is recommended that for each new supply of the solvent, a blank should be run on an asphalt binder of known properties. In case of dispute, reagent grade should be used.

Blank Determinations—Introduce about 70 g of asphalt binder into a 2000-mL flask (68-oz); add about 800 mL (27 oz) of solvent to dissolve the asphalt, allow the solution to stand for about 4 h; concentrate the solution by distillation to about 200 mL (6.8 oz) and then recover the asphalt binder. Total elapsed time from when the solvent is added to the time the recovery test is completed is about 7 h.

The values stated in SI units are to be regarded as the standard.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.