Akira¡¡NAKAJIMA
Study on recycling of low penetration reclaimed asphalt pavement including the modified materials
Guided by Prof. Teruhiko¡¡MARUYAMA
Asphalt extracted from old pavements must have penetration with more than 20, in order to be used in reclaimed pavements. Recently the penetration of the old asphalt from the recycled aggregate has a tendency to show small value. This standard value is intended for reclaimed asphalt pavement which include the straight asphalt, but we don¡Çt know whether the modified asphalt meet this standard or not. However, whether modified asphalt is included in recycled aggregate is hard to know the properties of, the recycled aggregate including the modified asphalt has not been evaluated.
Therefore in this study we focus on to the mixture property of the recycle mixture, in other to know whether we can use the recycled aggregate including the modified asphalt of the low penetration as a recycle mixture. We also inspect the modified effect lingered in recycle mixture. We made a deterioration mixture including the modified asphalt using an accelerated aging method and evaluated the deterioration characteristics of the modified asphalt mixture. The recycled aggregate including the modified asphalt of the low penetration is compared with the deterioration mixture including straight asphalt to see the change of the physical properties. As the deterioration mixture being made, we use the recycled aggregates as a part of replacement of new aggregate.
As the deterioration progresses, the cracking resistance and fatigue resistance of the modified asphalt mixture decreased. As the result, we know that the deterioration mixture shows a big change in the physical properties while the recycled aggregate does not. By using appropreate crush size and gradation of the recycled aggregate, the adjustment of the quantity of asphalt is possible and the recycle mixture that can satisfied the standard of the Marshall stability test can be created. The modified effect lingered in the recycle mixture is had to evaluate by only using indirect tensile test. It is also necessary to inspect other mixture including different asphalt.
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