Viscoelastic Study of the Asphalt Mixtures (3rd Report)

We have been studing Rheology for a few years, and by way of it's objects we are now treating asphalt mixtures. It was mentioned in the first report that the viscoelastic constant can be decided by using the method of least squares, and also the compressive test subjected to a linearly incleasing strain ε_0t was tried at different rate of strain, amount of filler and amount of asphalt. It is generally said that the stability value of asphalt mixture is largely affected by the temperature, so we must also make a special study of asphalt mixture at different temperature. In this paper, authors intend to examine the natures of asphalt mixtures is various temperature. From these study, if we can decide the proportion of asphalt mixture, it is very useful thing. For practical purporses, we must deal with two or three layers of viscoelastic bodies, but in it's case, it is very difficult to determine the viscoelastic constant. From now on, we can also regard soil as viscoelastic body, and Viscoelastic behavior of soil will be largely studied by many investigators. Anyway, a great many problems about the viscoelastic bodies are left without being solved. Materials such as steel and glass, often regarded as elastic at ordinary temperatures, on close observations are found also to exhibit small amounts of viscous behavior. This can be observed as creep (increase of deformation at constant stress) or stress relaxation (decay of elastic stress at constant deformation), and these effects may be important under certain conditions of use. To return to our subject, the compressive test subjected to a linearly incleasing strain ε_0t was tried at different rate of strain, amount of asphalt and temperature. The results of experiments are mentioned in this paper.