Kazuya YOSHIDA
Performance Estimate of the New Polymer Modified Asphalt by a Quasi Tensile Test
Osamu Takahashi, Graduate Adviser
In recent years, tends to increase the demand for modified asphalt, and prices is rising. Usually, one kind of polymer material is used as admixture to making modified asphalt. The performance of modified asphalt is greatly influenced by the kind and the quantity of admixture. Therefore, a new material which increases the performance of polymer added with the usual admixture. Thus, the performance of modified asphalt improved greatly by the quantity of admixture increases a little, and makes the modified asphalt of equivalent performance by more low prices.
The performance of improved asphalt was estimated by a quasi tensile test. A quasi tensile test is method to estimate the mechanical properties of asphalt binder. The relations between the tensile stress and the strain of asphalt binders can be obtained from this test by calculating varying cross section of the specimens under tensile assuming the volume of specimen is constant. This method has a strong correlation between "the peak energy obtained from stress strain curve of the tensile test for asphalt binders" and "the peak energy and the maximum strength of the indirect tensile test for asphalt mixtures".
As a result, the biggest performance effect appeared when using SBS as usual admixture if adding a new material. And the range of the optimum addition was 5% to 10%. However, the effect was differenced with kinds of SBS, there were the type of energy increases with a ductility increase, and the type of ductility increases but the maximum stress and energy decrease.
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