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A platform for research: civil engineering, architecture and urbanism
Temperature-Flow Functions for Certain Aspahlt Cements
The rheological properties of eight asphalt cements of 85 to 100 penetration from different sources has been studied. The method of reduced variables has been applied to viscosity-rate of shear data and composite master curves for these asphalts have been determined. By superposing the rheological data, the variation of shift factor a sub T with temperature is obtained and is presented graphically. The shift factor or the temperature dependence function a sub T for the asphalts studied was found to follow the wellknown Williams-Landel-Ferry Relation. For these asphalt cements, the characteristic temperature T sub s which allows superposing all a sub T functions has been also determined. In a comprehensive discussion related to the glass transition temperature, the significance of this characteristic temperature and its method of measurement has been presented. A modified penetrometric method was used for eavluating the glass transition temperature. These measurements were indicated to be comparable with volumetric methods. According to this method, the penetration of a flat ended penetrometer needle into the asphalt specimen was measured under a slowly increasing temperature condition. The penetrometer readings were plotted against temperature and the region of rapid change in the shape of plot was considered to include the glass-transition temperature. The glass-transition temperature of the asphalts were determined by a graphical method from these data. In addition, it has been shown also that the difference between characteristic temperature, T sub a, and the glass transition temperature, T sub g, is approximately 50C. This confirms the applicability of T sub g obtained by the penetrometric method. (Author)
Temperature-Flow Functions for Certain Aspahlt Cements
The rheological properties of eight asphalt cements of 85 to 100 penetration from different sources has been studied. The method of reduced variables has been applied to viscosity-rate of shear data and composite master curves for these asphalts have been determined. By superposing the rheological data, the variation of shift factor a sub T with temperature is obtained and is presented graphically. The shift factor or the temperature dependence function a sub T for the asphalts studied was found to follow the wellknown Williams-Landel-Ferry Relation. For these asphalt cements, the characteristic temperature T sub s which allows superposing all a sub T functions has been also determined. In a comprehensive discussion related to the glass transition temperature, the significance of this characteristic temperature and its method of measurement has been presented. A modified penetrometric method was used for eavluating the glass transition temperature. These measurements were indicated to be comparable with volumetric methods. According to this method, the penetration of a flat ended penetrometer needle into the asphalt specimen was measured under a slowly increasing temperature condition. The penetrometer readings were plotted against temperature and the region of rapid change in the shape of plot was considered to include the glass-transition temperature. The glass-transition temperature of the asphalts were determined by a graphical method from these data. In addition, it has been shown also that the difference between characteristic temperature, T sub a, and the glass transition temperature, T sub g, is approximately 50C. This confirms the applicability of T sub g obtained by the penetrometric method. (Author)
Temperature-Flow Functions for Certain Aspahlt Cements
S. K. Shoor (author) / K. Majidzadeh (author) / H. E. Schweyer (author)
1965
24 pages
Report
No indication
English
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