ABSORPTION OF ASPHALT INTO POROUS AGGREGATES: TEST OF A SIMPLE PHYSICOCHEMICAL MODEL

Autor: James A. Guin, Hung-Sheng Chang, Cheng-Tsung Kuo, Shih-Chao Yen
Rok vydání: 1992
Předmět:
Zdroj: Fuel Science and Technology International. 10:649-680
ISSN: 0884-3759
DOI: 10.1080/08843759208916015
Popis: Absorption is the process in which asphalt flows into a porous aggregate, under the driving force of capillary pressure. Asphalt absorption is of interest because it represents an economic loss of effective binder, and because it may change the properties of the resulting asphalt film and lead to premature pavement distress. Incorrect air voids estimation may also result from failure to properly account for asphalt absorption in pavement design. The objective of this research was to determine the temporal dependence of absorption upon asphalt and aggregate properties and to test a rational model for this dependence. Absorption data were obtained for several model liquids and asphalts with synthetic alumina aggregates and a natural limestone aggregate. The data were used to test a simple absorption model incorporating the effects of asphalt and aggregate properties into a single dimensionless time variable. While quantitative agreement was not obtained in all aspects of the model, certain predicti...
Databáze: OpenAIRE