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Asphalt Changes in Drum Dryer and Batch Operations

by Brian H. Chollar, Federal Highway Administration, United States,
Joseph A. Zenewitz, Federal Highway Administration, United States,
Kim T. Tran, Federal Highway Administration, United States,
John G. Boone, Federal Highway Administration, United States,
Durga Kumari, Federal Highway Administration, United States,



Document Type: Proceeding Paper

Part of: Serviceability and Durability of Construction Materials

Abstract:

The study was designed to determine whether steam distillation of asphalt takes place in a drum dryer mixer by comparing changes induced by various laboratory conditioning (aging) techniques versus those occurring in drum dryer mixers. Possible differences in asphalts subjected to drum dryer mixing versus batch mixing were to be identified, also. Fifty five virgin asphalts were subjected to various laboratory conditioning experiments including thin film oven (TFO), rolling thin film oven (RTFO), small steam distillation (SSD), and rolling forced air distillation (RFAD). Various physical and chemical properties of these conditioned samples were measured and compared with those of the residues recovered from drum dryer operations for each asphalt. The comparison of these properties demonstrated that steam distillation does not take place in drum dryer mixers. Additional study results are discussed.

Subject Headings: Laboratory tests | Comparative studies | Chemical properties | Aging (material) | Materials processing | Physical properties | Material properties

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