Changes occurring in asphalts in drum dryer and batch (pug mill) mixing operations
Title:
Changes occurring in asphalts in drum dryer and batch (pug mill) mixing operations
Author:
Chollar, B. H.
Publication Information:
McLean, Va. : Federal Highway Administration ; [Springfield, Va. : Available through the National Technical Information Service, 1989]
Physical Description:
vii, 93 p. : ill. ; 28 cm.
General Note:
Cover title.
"December 1989."
Includes glossary.
Contents:
Introduction -- Problem -- Approach -- Experimental: Conditioning procedures, Analytical procedures, and Repeatability and available reproducibility of the various laboratory methods employed in this study -- Results: Comparisons of laboratory exposure residues with extracted drum dryer mix residues, Comparisons of Georgia asphalts processed in drum dryer mixers versus in batch (pug mill) plants, and Penetration comparisons of TFO residues with drum dryer residues -- Conclusions -- Appendices.
Abstract:
The study was designed (1) to discover whether steam distillation of asphalt takes place in a drum dryer mixer, (2) to compare changes induced by various laboratory conditioning (aging) techniques versus those occurring in drum dryer mixers, and (3) to identify possible differences in asphalts subjected to drum dryer mixing versus batch (pug mill) mixing. Fifty-five virgin asphalts were subjected to various laboratory conditioning experiments including thin film oven exposure (TFO), rolling thin film oven exposure (RTFO), (small) steam distillation (SSD), forced air distillation (FAD), and rolling forced air distillation (RFAD). Various physical and chemical properties of these conditioned samples were measured. These properties were compared with those of the residues recovered from drum dryer operations for each asphalt.
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