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道路利用者の安全性と快適性を考慮したアスファルト舗装のポットホールメンテナンスにおける優先順位付けと措置方法の改善
https://doi.org/10.19000/0002000830
https://doi.org/10.19000/000200083086e7ee2e-1e98-44d5-99af-09dc9bfbdce2
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
甲221_LIJALEM YALEW MELESE.pdf (16.5 MB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||
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| 公開日 | 2025-04-25 | |||||||
| タイトル | ||||||||
| タイトル | Improvement of Prioritization and Treatment Method on Pothole Maintenance in Asphalt Pavement Considering Road User Safety and Comfort | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | 道路利用者の安全性と快適性を考慮したアスファルト舗装のポットホールメンテナンスにおける優先順位付けと措置方法の改善 | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源 | http://purl.org/coar/resource_type/c_db06 | |||||||
| タイプ | doctoral thesis | |||||||
| ID登録 | ||||||||
| ID登録 | 10.19000/0002000830 | |||||||
| ID登録タイプ | JaLC | |||||||
| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| 著者 |
LIJALEM, YALEW, MELESE
× LIJALEM, YALEW, MELESE
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Among the asphalt pavement distresses, a pothole is one of the potential risks reducing traffic safety and comfort of road users. It leads to traffic accidents while the overall pavement condition is acceptable according to the maintenance threshold. From a road asset management viewpoint, potholes should be prioritized and maintained by the dimensions corresponding to the degree of impact on the safety and comfort of road users. In this context, treatment methods for pothole maintenance should also be carefully considered to avoid repeated failure,especially after rainy seasons. In light of this background, this study aims to improve the prioritization and treatment method for pothole maintenance in terms of the safety and comfort of road users as well as the durability of pavements repaired with patching in rainy areas such as Ethiopia. This study consists of the following three phases. The first phase evaluates the safety and comfort of traveling over potholes with various dimensions as well as the International Roughness Index (IRI) by conducting experiments using the Kitami Institute of Technology Driving Simulator (KITDS). In the experiment, this study introduces a novel approach to the safety measure, which is perception reaction time based on the theory of cognitive psychology. The comfort issue against the pothole is assessed with a questionnaire survey to the participants as well. The result shows that potholes with a width of 500 mm with a depth greater than 50 mm and 750 mm with a depth greater than 25 mm should be prioritized and maintained to secure the safety and comfort of road users even though the roughness in terms of the IRIs are in good condition. The second phase proposes a new treatment method for potholes by raising the patches above the existing asphalt surface. A critical issue leading to patching failure is that patches settle after construction due to traffic loading, which is then accumulating rainwater. Accordingly, this study introduces the raised patch concept. Possible raising heights are tested in terms of vehicle safety and comfort by a driving experiment using KITDS in the same manner as the first phase. As a result, raised patches of 15 mm in height for widths of 200 and 500 mm and 10 mm in height for a width of 750mm can be acceptable for safety and comfort while increasing the durability of patching treatments. Applying the maintenance threshold in terms of the IRI established by the Addis Ababa City Roads Authority (AACRA), which is 4 mm/m for roads in good condition, up to eight potholes with widths less than 750 mm can be treated by the raised patch concept. This concept also enables other countries to decide the number of potholes to be patched by considering the IRI threshold. The third phase examines the practical applications of raised patches with different types of mixtures in terms of durability by the Immersion Wheel Tracking Test (IWTT). First, wheel-tracking specimens are prepared from straight hot mix asphalt. Then, a hole is created at the center of each specimen. After that, the hole is patched using a straight and modified hot mix asphalt as well as a cold mix. Finally, the patched specimens are tested by the IWTT to confirm the durability of the patching treatment in terms of the settlement caused by traffic loading. The result clearly shows that the raised patches, even with straight hot mix asphalt, are more durable than conventional patching treatments by maintaining the patch over the existing surface. However, straight hot mix asphalt indicates poor patching performance in moisture conditions, such as during the rainy season. In contrast, modified hot mix asphalt, by which the modifier is resistant to the stripping effect of water, exhibits durability against moisture conditions. This study also recommends that a water-activated cold mix is used for emergency repair because it permits compaction with water and requires no heating. Potholes cause discomfort and traffic accidents for traveling vehicles, leading to an increase in road user costs. This study contributes to the improvement of road asset management with special attention not only to the implementation of effective pothole maintenance but also to the safety and comfort of road users. In particular, realizing the pothole maintenance by the proposed methods and criteria in this study can secure safe and comfortable traffic and result in revitalizing the economy in developing countries. |
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| 言語 | en | |||||||
| bibliographic_information |
発行日 2025-03 |
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| 学位名 | ||||||||
| 言語 | ja | |||||||
| 学位名 | 博士(工学) | |||||||
| item_7_degree_grantor_61 | ||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||
| 学位授与機関識別子 | 10106 | |||||||
| 言語 | ja | |||||||
| 学位授与機関名 | 北見工業大学 | |||||||
| dissertation_number | ||||||||
| 学位授与番号 | 甲第221号 | |||||||
| item_7_text_66 | ||||||||
| 言語 | ja | |||||||
| 研究科・専攻名 | 生産基盤工学専攻 | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2025-03-21 | |||||||
