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Relationship of Ductility Test to the Fundamental Mechanical Properties of Asphalts
Ductilities were obtained at four temperatures, 25C(77F), 18C(64.4F), 11C(51.8F), 4C(39.2F), and at two rates of pull, 5 and 1 cm/min, on seven viscosity-graded asphalt cements and on eight asphalt cements. The ductility measurements were correlated with each of the following mechanical properties: (a) maximum load required to stretch the ductility specimens, (b) deformation to maximum load, (c) pseudo-stiffness (maximum load divided by deformation to maximum load, (d) tensile strength in thin films, (e) shear strength, (f) shear susceptibility (negative ratio of an increment of log viscosity to the corresponding increment of log rate of shear, and (g) brittle fracture. The conclusions arrived at by the researchers include the following: (1) There did not appear to be any relationship between ductility and any of the mechanical properties at all test temperatures for all the asphalt cements. (2) At cold temperatures 94C), the ductility of an asphalt is related to its brittle fracture (fracture toughness). (3) At warmer temperatures there appears to be an inverse relationship between log ductility and log shear strength. (4) At a specific temperature there is probably an inverse relationship between shear susceptibility and log ductility. It was further concluded that the ductility test is not strictly a mechanical test but one that probably measures both strength and chemical properties of the asphalt. A linear relationship between log viscosity of an asphalt and its tensile strength in thin films was found. (Author)
Relationship of Ductility Test to the Fundamental Mechanical Properties of Asphalts
Ductilities were obtained at four temperatures, 25C(77F), 18C(64.4F), 11C(51.8F), 4C(39.2F), and at two rates of pull, 5 and 1 cm/min, on seven viscosity-graded asphalt cements and on eight asphalt cements. The ductility measurements were correlated with each of the following mechanical properties: (a) maximum load required to stretch the ductility specimens, (b) deformation to maximum load, (c) pseudo-stiffness (maximum load divided by deformation to maximum load, (d) tensile strength in thin films, (e) shear strength, (f) shear susceptibility (negative ratio of an increment of log viscosity to the corresponding increment of log rate of shear, and (g) brittle fracture. The conclusions arrived at by the researchers include the following: (1) There did not appear to be any relationship between ductility and any of the mechanical properties at all test temperatures for all the asphalt cements. (2) At cold temperatures 94C), the ductility of an asphalt is related to its brittle fracture (fracture toughness). (3) At warmer temperatures there appears to be an inverse relationship between log ductility and log shear strength. (4) At a specific temperature there is probably an inverse relationship between shear susceptibility and log ductility. It was further concluded that the ductility test is not strictly a mechanical test but one that probably measures both strength and chemical properties of the asphalt. A linear relationship between log viscosity of an asphalt and its tensile strength in thin films was found. (Author)
Relationship of Ductility Test to the Fundamental Mechanical Properties of Asphalts
M. Herrin (author) / C. R. Marek (author)
1969
121 pages
Report
No indication
English
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