アスファルトのガラス転移とレオロジー : 分散型のレオロジー

概要

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Volume dilatometry was made for nine kinds of asphalt in a wide range of asphaltene content X. The glass transition temperature T_g becomes higher with increase of X. The discontinuity in thermal expansion coefficient at T_g decreases with X, and T_g can no more be observed for X>70%. The complex shear modulus and shear creep compliance of five samples of asphalt were measured. Above T_g, asphalt is viscoelastic. The time-temperature reducibility applies very well to asphalt. The temperature dependence of retardation times as well as steady flow viscosity obeys to Williams-Landel-Ferry's equation, the standard temperature involved in this equation being 56゜ higher than T_g for all the samples. The distribution function of retardation times is approximately of a wedge shape when plotted in logarithmic scales, the slope being 0.5 or less according to X. The steady flow viscosity and the maximum retardation time at 20℃ markedly increase with X. These facts allow us some predictions about molecular behaviors in asphalt. Rheology of asphalt mixed with fine powder and asphalt mixed with turpentine oil as a plasticizer is also investigated. Development of a new type of test instrument for asphalt is now going on in our laboratory. Some of the results have been published in the following literatures : 1) J. Phys. Soc. Japan, 15, 1885 (1960) 2) J. Appl. Phys. Japan, 30, 46 (1961) 3) ibid. 29, 557 (1960)
社団法人日本材料学会の論文
1961-05-15