Abstract
This project is launched to identify the specific deterioration of asphalt pavement, and detect the real cause of each damage occurred in field. The study was conducted with comparison of in-situ status in damaged and non-damaged sections after almost twenty years under traffics. Specimens for lab tests were taken by block sampling of both asphalt layers and granular subbase course. Based on the field observation of the damaged part and various testing results, several important key factors were found out for long term durability of asphalt pavement. Those points, such as total thickness of asphalt layers, durability of asphalt stabilized (third) layer and bonding property of each layers are vitally important to prevent fatigue cracking. Well graded in good compaction of granular subbase and subgrade are also key issue to support traffics in long period without permanent deformation. Preventing water penetration through the pavement into its base is another important factor to avoid severe deterioration in field. 高速道路の供用年数が伸びるに従い，アスファルト舗装の経年劣化や下層の脆弱化により，路盤からの厚層打換補修を強いられる箇所が近年増加している．このような状況を憂い，供用後約20年を経た高速道路において，補修履歴のない健全部と数度の補修を繰返してきた損傷部を比較する形で，大規模な開削調査を実施した．本プロジェクトは，実道におけるアスファルト舗装の損傷実態の把握と原因の究明を行うものであり，調査の結果，高速道路における疲労ひび割れや永久変形の発生事例が確認され，アスファルト混合物の層間接着や路盤の滞水による脆弱化等，現地の舗装において長期耐久性の鍵を握っているポイントを明らかにした．
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Schedule a callMore From: Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering)
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