Study on Fatigue Damage Mechanism of Bridge Surface Asphalt Pavement Considering Deterioration of Concrete Deck

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14806
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 22010:Civil engineering material, execution and construction management-related
• Research Institution: Nihon University
• Principal Investigator: MAESHIMA Takuya 日本大学, 工学部, 講師 (20845630)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 橋面アスファルト舗装 / コンクリート床版 / 疲労抵抗性 / 砂利化

Outline of Final Research Achievements

This study aims to experimentally investigate the mutual dependence between concrete deck and asphalt pavement, which can be considered to have a very small number of case studies. Test specimens were created by laying asphalt concrete on concrete decks that simulated aggregates disintegration, and water immersion wheel tracking tests were conducted. The results revealed that the fatigue resistance of the asphalt pavement decreases due to the reduction in the support strength of the concrete decks, and regardless of the binder type or test temperature of the asphalt concrete, the bridge pavement is subject to early failure due to the reduction in the support strength of the concrete decks when aggregates disintegration on the concrete decks. Furthermore, based on the damage status after the test, tortoise shell shaped cracks were observed on the surface of the pavement slab, indicating the potential for reproducing potholes using this test method.

Free Research Field

舗装工学

Academic Significance and Societal Importance of the Research Achievements

本研究は，国内外を問わず研究例の少ない床版の劣化とアスファルト舗装の相互依存性について実験的に検討したものであり，当該研究分野における基礎的な知見を得られた点で学術的価値は高いと考えられる。また，実際の道路橋で見られるアスファルト舗装から土砂が噴出するといった現象を再現し得る試験方法を提案するとともに，道路橋床版の劣化がアスファルト舗装の早期破壊に影響を及ぼすことを明らかにするなど，これまでにない新たな着眼点から道路橋の長寿命化に寄与する知見を与えている。また，本研究で提案した試験方法は土工部におけるアスファルト舗装の疲労抵抗性を評価可能であり，今後の研究発展に大いに期待できると考える。