INFLUENCE OF CHEMICAL COMPOSITION ON ASPHALTS ON PERFORMANCE, PARTICULARLY DURABILITY
IT IS GENERALLY RECOGNIZED THAT FAILURES OF ASPHALT PAVEMENTS CAUSED BY EMBRITTLEMENT AND OTHER CHANGES IN PHYSICAL PROPERTIES DURING THE AGING PROCESS ARE DUE TO CHEMICAL REACTIONS OF ALL OR SOME OF THE ASPHALT COMPONENTS. THIS PAPER ATTEMPTS TO CORRELATE CHEMICAL COMPOSITION OF ASPHALTS WITH THEIR PERFORMANCE AS A BINDER AND TO DEMONSTRATE THAT CHANGES IN CHEMICAL COMPOSITION PARALLEL CHANGES IN PERFORMANCE. THE CHEMICAL ANALYSIS USED IN THIS INVESTIGATION IS THE PRECIPITATION METHOD BY ROSTLER AND STERNBERG WHICH DEFINES ASPHALTS AS CONSISTING OF FIVE GROUPS OF COMPONENTS WHICH CAN BE ISOLATED AND TESTED AS TO PERFORMANCE, INDIVIDUALLY AND AS BLENDS. THE ANALYTICAL METHOD USED IS CONTRASTED WITH FOUR OTHER METHODS PROPOSED FOR CHEMICAL IDENTIFICATION OF ASPHALTS. THE LABORATORY TESTS USED IN STUDYING PERFORMANCE ARE (1) ABRASION RESISTANCE OF OTTAWA SAND-ASPHALT MIXTURES BEFORE WEATHERING AND DURING VARIOUS STAGES OF WEATHERING, AND (2) COHESION OF OTTAWA SAND-ASPHALT MIXTURES. SOME CONVENTIONAL DATA SUCH AS USED FOR SPECIFICATION PURPOSES ARE ALSO SHOWN. THE DATA REPORTED INDICATE (1) THAT CHEMICAL COMPOSITION OF ASPHALTS IS BETTER DEFINED BY A PRECIPITATION METHOD THAN BY ANALYTICAL PROCEDURES BASED ON SOLUTION AND ADSORPTION EQUILIBRIA, AND (2) THAT PHYSICAL, INCLUDING RHEOLOGICAL, PROPERTIES OF ASPHALTS AND CHANGES OF THESE PROPERTIES DURING WEATHERING CAN BE CORRELATED WITH CHANGES IN CHEMICAL COMPOSITION. LABORATORY PREPARED ASPHALTS, COMMERCIALLY AVAILABLE ASPHALTS, AND ASPHALTS EXTRACTED FROM CORES FROM ROADS OF KNOWN HISTORY WERE USED IN THESE TESTS.
-
Supplemental Notes:
- No 277, P 64
-
Authors:
- Rostler, F S
- White, R M
- Publication Date: 1959
Media Info
Subject/Index Terms
- TRT Terms: Abrasion tests; Asphalt; Asphalt pavements; Asphaltic sand; Binders; Chemical analysis; Chemical composition; Cohesion; Core samples; Durability; Evaluation; Laboratory tests; Pavement performance; Pavements; Resource extraction; Rheology; Weathering
- Uncontrolled Terms: Extraction (Chemistry)
- Old TRIS Terms: Aging; Cores; Precipitation
- Subject Areas: Highways; Materials; Pavements;
Filing Info
- Accession Number: 00210931
- Record Type: Publication
- Source Agency: Highway Research Board Bibliography
- Files: TRIS
- Created Date: Jun 3 1994 12:00AM