A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Fingerprinting Versus Field Performance of Paving Grade Asphalts
Recent field construction experience has raised the question whether the properties of paving asphalts have changed since the oil embargo of 1973. To address this question, 97 asphalts were collected from state highway agencies across the United States. The specimens were tested in the laboratory, employing the same test procedures used to develop the FHWA (formerly BPR) fingerprint file. This file contains data on more than 400 asphalts produced in 1950 and 1960. These data, together with a recent data set obtained by the Asphalt Institute, were the basis of a statistical comparison of the properties of asphalts produced between 1950 and 1980. Statistical procedures were used to determine fractional composition, temperature susceptibility, effect of heating, and shear susceptibility, according to year of production. The conclusion of the study is that there have been statistically significant changes in asphalt properties during the period 1950-1980. Temperature susceptibility has increased, and limited data indicate an increase in shear susceptibility. Chemical composition has changed: there appears to be more variability in the asphalts, with a tendency toward a larger percentage possessing either high or low Rostler (composition) parameters. However, the effect of heating (thin-film oven test) does not appear to have changed during this period.
Fingerprinting Versus Field Performance of Paving Grade Asphalts
Recent field construction experience has raised the question whether the properties of paving asphalts have changed since the oil embargo of 1973. To address this question, 97 asphalts were collected from state highway agencies across the United States. The specimens were tested in the laboratory, employing the same test procedures used to develop the FHWA (formerly BPR) fingerprint file. This file contains data on more than 400 asphalts produced in 1950 and 1960. These data, together with a recent data set obtained by the Asphalt Institute, were the basis of a statistical comparison of the properties of asphalts produced between 1950 and 1980. Statistical procedures were used to determine fractional composition, temperature susceptibility, effect of heating, and shear susceptibility, according to year of production. The conclusion of the study is that there have been statistically significant changes in asphalt properties during the period 1950-1980. Temperature susceptibility has increased, and limited data indicate an increase in shear susceptibility. Chemical composition has changed: there appears to be more variability in the asphalts, with a tendency toward a larger percentage possessing either high or low Rostler (composition) parameters. However, the effect of heating (thin-film oven test) does not appear to have changed during this period.
Fingerprinting Versus Field Performance of Paving Grade Asphalts
D. A. Anderson (author) / E. L. Dukatz (author)
1981
77 pages
Report
No indication
English
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