The Baltic Journal of Road and Bridge Engineering最新文献

Performance Characterisation of High RA Asphalt Mixes – A Laboratory and Field Study 高 RA 沥青混合料的性能特征 - 实验室和现场研究

The Baltic Journal of Road and Bridge Engineering Pub Date : 2024-03-25 DOI: 10.7250/bjrbe.2024-19.628

Csaba Tóth, L. Petho, S. Rosta

{"title":"Performance Characterisation of High RA Asphalt Mixes – A Laboratory and Field Study","authors":"Csaba Tóth, L. Petho, S. Rosta","doi":"10.7250/bjrbe.2024-19.628","DOIUrl":"https://doi.org/10.7250/bjrbe.2024-19.628","url":null,"abstract":"The research project highlights the significance of incorporating reclaimed asphalt (RA) into hot mix asphalt (HMA) production for sustainable road construction. Despite limited RA utilization in Hungary in the past decades, the project demonstrates the feasibility of manufacturing HMA with significant RA content using advanced technology. The establishment of a capable asphalt plant and the development of laboratory assessments and mix design methodologies laid a solid foundation for future high RA integration in Hungarian road projects. Large-scale production trials confirmed the practicality of integrating high RA content into heavy-duty asphalt mixes with various binder types, including normal bitumen (B), polymer modified binder (PmB), and rubber modified bitumen (GmB). The large-scale validation project described in this paper was based on crucial binder blend designs carried out prior to the trials. Production control and performance-based laboratory testing proved that asphalt mixes can be designed and manufactured with high RA content while maintaining performance standards. Balancing resistance to distress modes like rutting and low-temperature cracking through careful binder blend design and mix design is achievable, even with high RA proportions. Visual assessments and production control indicated the uniformity of high RA content asphalt mixes. The details provided in this paper emphasise the potential for economic and environmental benefits through increased RA utilization in Hungarian road construction.","PeriodicalId":506825,"journal":{"name":"The Baltic Journal of Road and Bridge Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140384068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identification of Road Black Spots Based on the Sliding Window Optimization and Safety Performance Function Development 基于滑动窗口优化和安全性能函数开发的道路黑点识别

The Baltic Journal of Road and Bridge Engineering Pub Date : 2024-03-25 DOI: 10.7250/bjrbe.2024-19.629

Shahin Shabani, Jalal Ayoubinejad, N. B. Rahmanian

{"title":"Identification of Road Black Spots Based on the Sliding Window Optimization and Safety Performance Function Development","authors":"Shahin Shabani, Jalal Ayoubinejad, N. B. Rahmanian","doi":"10.7250/bjrbe.2024-19.629","DOIUrl":"https://doi.org/10.7250/bjrbe.2024-19.629","url":null,"abstract":"The sliding window method is a road network screening approach commonly used for identifying black spots. Previous studies have indicated that the selection of window length significantly impacts the black spot identification process. This research proposes a new method that optimizes the sliding window framework by examining its characteristics. The optimization methodology employed in this study is as follows: Firstly, the road is segmented, and for each segment, different scenarios of window lengths are chosen using the Density-Based Spatial Clustering of Applications with Noise algorithm. Next, a Safety Performance Function is developed to calculate the predicted and expected number of crashes, as well as the Potential Safety Improvement, for each window movement across all selected scenarios within the segment. Subsequently, the average differences are calculated using the analysis of variance, and the window length with the lowest dispersion of difference values from the mean is identified as the optimal length for each segment. The case study yielded noteworthy results, indicating that the utilization of the sliding window with optimal lengths led to the identification of 122 high-risk black spot-candidates. These points exhibit a higher crash density, effective length, and greater value in quantitative evaluation tests compared to the results obtained using windows with common fixed lengths.","PeriodicalId":506825,"journal":{"name":"The Baltic Journal of Road and Bridge Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140382278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Limit States of Shallow Bridge Foundations With Sheet Piling Covers 带板桩盖的浅桥地基的极限状态

The Baltic Journal of Road and Bridge Engineering Pub Date : 2024-03-25 DOI: 10.7250/bjrbe.2024-19.632

Michał Wymysłowski

{"title":"Limit States of Shallow Bridge Foundations With Sheet Piling Covers","authors":"Michał Wymysłowski","doi":"10.7250/bjrbe.2024-19.632","DOIUrl":"https://doi.org/10.7250/bjrbe.2024-19.632","url":null,"abstract":"This article presents an analytical method which takes into account the beneficial effects of the sheet piling located around the foundation in the calculations of ULS and SLS of shallow foundations. The analytical method proposed by the author was described in detail on the example of a “theoretical bridge” with the assumed geometry and loads as well as with the assumed subsoil and water conditions under the bridge. The stresses in the subsoil under the foundation and the settlement were determined. The author’s method was also used to calculate the foundation settlement of an “existing bridge” located in Gdańsk (Poland). In both cases, the results were compared with the results obtained using PLAXIS 3D Advanced 2023.1 and additionally with geodetic measurements for “existing bridge”. The author’s proposal was based on the EN 1997-1: Eurocode 7 standard applicable in the European Union. It has original elements that are not included in the cited standard. The proposed method is not the only one that could be used to assess the limit states of shallow foundations with sheet piling cover. However, it is based on the applicable regulations, gives similar results to the results obtained with FEM and geodetic measurements.","PeriodicalId":506825,"journal":{"name":"The Baltic Journal of Road and Bridge Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140383912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the Stiffness of a Specially Strengthened Bridge When Crossed by Very Heavy Vehicles – A Case Study 重型车辆通过特别加固桥梁时的刚度调查 - 案例研究

The Baltic Journal of Road and Bridge Engineering Pub Date : 2024-03-25 DOI: 10.7250/bjrbe.2024-19.625

C. Machelski, Maciej Hildebrand, Maksymilian Kliński

引用次数: 0

Road Traffic Flow Speed on Rural Roads in Latvia 拉脱维亚乡村公路的车流速度

The Baltic Journal of Road and Bridge Engineering Pub Date : 2024-03-25 DOI: 10.7250/bjrbe.2024-19.630

J. Kreicbergs, Katerina Folla, J. Smirnovs

引用次数: 0

Rebuilding Bailey Bridge to Bridge With Bascule Span – A Case Study 将贝利桥重建为带斜拉桥 - 案例研究

The Baltic Journal of Road and Bridge Engineering Pub Date : 2024-03-25 DOI: 10.7250/bjrbe.2024-19.631

Andrzej Ambroziak, Maciej Malinowski, Mirosław Wałęga

引用次数: 0

Effects of Transition Curves and Superelevation on the Critical States of Truck Rollovers on Sharp Curves 过渡弯和超高对卡车在急弯上翻车临界状态的影响

The Baltic Journal of Road and Bridge Engineering Pub Date : 2024-03-25 DOI: 10.7250/bjrbe.2024-19.627

Junxian Chen, Yonggang Wang

{"title":"Effects of Transition Curves and Superelevation on the Critical States of Truck Rollovers on Sharp Curves","authors":"Junxian Chen, Yonggang Wang","doi":"10.7250/bjrbe.2024-19.627","DOIUrl":"https://doi.org/10.7250/bjrbe.2024-19.627","url":null,"abstract":"Sharp curves are vulnerable sections for rollover accidents. This study was conducted to investigate the effects of transition curve and superelevation on the critical speed and critical braking distance of truck rollovers. Using different transition types (spiral, Bloss and Grabowski curve) and different superelevation values (6%, 120 m transition length and 8%, 160 m) as variables, experiments of constant speed driving and hard braking were simulated and conducted by Trucksim. Conclusions regarding the influence of these road design factors on the stability of vehicles were then proposed. Grabowski curve allowed for the maximum critical rollover speed. The difference in critical rollover speed between different transition types was only determined by the length of the transition section. Simply extending the length of the transition section increased the critical rollover speed of spiral curve, at the same time decreasing the critical speed of Bloss and Grabowski curve. Hard braking experiments showed completely different characteristics. As the initial speed increased, only spiral curve became safer. Increasing superelevation made the braking behaviour of the vehicle more dangerous and fraught with uncertainties due to different target speed, starting curvature and changing superelevation. Based on these findings, a number of useful recommendations for drivers and road designers were put forward.","PeriodicalId":506825,"journal":{"name":"The Baltic Journal of Road and Bridge Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140383820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0