A proposed new ASTM International standard will be used for testing the asphalt used in common pavements. ASTM WK40799, Practice for Recovery of Asphalt from Solution Using Toluene and the Rotary Evaporator, is being developed by Subcommittee D04.25 on Analysis of Bituminous Mixtures, part of ASTM International Committee D04 on Road and Paving Materials.
Asphalt pavements comprise mostly liquid asphalt binder (bitumen) and aggregates, which are blended differently (coarse, fine, open, dense) for various needs. Asphalt binder is also graded to meet different climatic and load requirements.
“For example, different liquid binders are used for cold, rural areas, as compared to hot, urban environments,” says Phillip Blankenship, senior research engineer, Asphalt Institute, and a D04 member.
ASTM WK40799 will provide laboratories with the instructions to extract liquid asphalt bitumen from asphalt-aggregate mixture using toluene and a rotary evaporator. The practice is designed to minimize changes in the asphalt properties during the recovery process.
After the liquid asphalt has been recovered, its properties can be measured to understand the performance of an in-place pavement. Additionally, the proposed standard will allow the recovery of bitumen in reclaimed asphalt pavement and recycled asphalt shingles.
“This proposed standard promotes a more consistent measurement of the recovered liquid binder using a rotary evaporator,” says Blankenship.
Once approved, the proposed standard will be useful to private, research and consulting laboratories as well as departments of transportation. Interested parties are invited to join in the standards developing activities of D04.25. The subcommittee will eventually be seeking laboratories to participate in interlaboratory testing of ASTM WK40799.
ASTM International welcomes participation in the development of its standards. For more information on becoming an ASTM member, visit www.astm.org/JOIN.
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ASTM Committee D04 Next Meeting: Dec. 10-12, 2013, December Committee Week, Jacksonville, Fla.
Technical Contact: Phillip Blankenship, P.E., Asphalt Institute, Lexington, Ky., Phone: 859-288-4986; pblankenship@asphaltinstitute.org
ASTM Staff Contact: Daniel Smith, Phone: 610-832-9727; dsmith@astm.org
ASTM PR Contact: Barbara Schindler, Phone: 610-832-9603; bschindl@astm.org
Release #9530