供用中におけるアスファルト舗装の老化の研究
アスファルトの劣化に及ぼす路面からの深さの影響
1975 年 18 巻 1 号 p. 30-33
詳細
1975 年 18 巻 1 号 p. 30-33
The purpose of this study was to determine how the aging of asphalt in actual pavement in service for three years varied with depth below the pavement surface and transverse distance from the pavemenet side. Then the properties of recovered asphalt from the core were observed with gel permeation chromatography, infrared-spectroscopy, and chromatographic fractionations. The following results were obtained:
1) The density of core increased toward the center line with traffic roads, and the penetration of asphalt recovered from the core corresponded to tendency of the core density.
2) Properties of recovered asphalt greatly depend on the depth below the pavement surface, and the hardening and oxidation of asphalt rapidly proceed in the depth 0-0.5cm below the pavement surface. This phenomenon is more clarly seen in the side of pavement.
3) The asphalt in the upper section-i.e. 0-0.5cm below the pavement surface-shows remarkable deviation from the linear relation between the extinction coefficient of carboniumbond and the reciprocal of penetration observed by thin film and rolling thin film oven tests, but the asphalt in the lower section shows a good agreement with the linear relation.
