Rheological Properties of Asphalts III. A Viscosity Index
| Autor: | R. N. Traxler, H. E. Schweyer |
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| Rok vydání: | 1936 |
| Předmět: | |
| Zdroj: | Physics. 7:67-72 |
| ISSN: | 2163-5102 0148-6349 |
| DOI: | 10.1063/1.1745364 |
| Popis: | A review is given of the work which has been done on the temperature‐viscosity relations of bituminous materials and it is pointed out that the methods commonly used for evaluating the changes of consistency with temperature are empirical and unsatisfactory. Viscosity measurements at temperatures ranging from 15° to 35°C have been made on fourteen asphalts of paving consistency by means of the alternating stress method described by Bingham and Stephens. It has been found that for these asphalts and temperatures a plot of the logarithm of viscosity against temperature gives essentially a straight line. An asphalt viscosity index is established which is defined by the relationship: A.V.I.=100(10a−1), where ``a'' is the slope of the log viscosity versus temperature plot. To obtain numerical values for the A.V.I. it is only necessary to determine experimentally the viscosity at two temperatures (in the range where the straight line relation holds) and substitute in the expression: A.V.I.=100[(ηcηd)1/(tc−td)−1... |
| Databáze: | OpenAIRE |
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