Journal of Road Engineering最新文献

Review on the properties and mechanisms of asphalt modified with bio-oil and biochar

Journal of Road Engineering

Pub Date : 2024-12-01 DOI: 10.1016/j.jreng.2024.06.001

Xinxing Zhou , Ziyang Zhang , Haopeng Wang , Meizhu Chen , Shaopeng Wu , Song Xu , Xinglin Zhou , Maoping Ran , Linglin Li , Guangjun Lu , Zhibin Ma

Bio-asphalt has a great application prospect in the replacement of petroleum-based asphalt to pave and maintain asphalt pavement. However, the problems of flow-induced crystallization and phase separation caused by flow-induced crystallization had severely restricted its application. This paper describes the progress of research on preparation, property evaluation and phase separation mechanism of bio-asphalt. The advantages and disadvantages of preparation methods of bio-asphalt are states. The fundamental physical and rheological properties of bio-asphalt are investigated, especially for flow-induced crystallization. There exists obvious flow-induced crystallization because bio-asphalt is rich in waxes that crystallize easily. Owing to the existence of excess biochar, bio-asphalt appears phase separation. A brief review of the effect of bio-oil and biochar on asphalt volatile organic compounds (VOCs) is presented. Research find that bio-oil/biochar are not only replenish the light components of asphalt, but also improve the flow-induced crystallization and phase separation of bio-asphalt. There exists synergistic effect of biochar and bio-oil in asphalt modification. Moreover, biochar can improve the durability of bio-oil modified asphalt, but excessive addition of biochar to bio-oil modified asphalt can cause phase separation. Adding an appropriate amount of bio-oil and biochar to asphalt can improve its high-temperature resistance, low-temperature crack resistance, and system compatibility.

{"title":"Review on the properties and mechanisms of asphalt modified with bio-oil and biochar","authors":"Xinxing Zhou , Ziyang Zhang , Haopeng Wang , Meizhu Chen , Shaopeng Wu , Song Xu , Xinglin Zhou , Maoping Ran , Linglin Li , Guangjun Lu , Zhibin Ma","doi":"10.1016/j.jreng.2024.06.001","DOIUrl":"10.1016/j.jreng.2024.06.001","url":null,"abstract":"<div><div>Bio-asphalt has a great application prospect in the replacement of petroleum-based asphalt to pave and maintain asphalt pavement. However, the problems of flow-induced crystallization and phase separation caused by flow-induced crystallization had severely restricted its application. This paper describes the progress of research on preparation, property evaluation and phase separation mechanism of bio-asphalt. The advantages and disadvantages of preparation methods of bio-asphalt are states. The fundamental physical and rheological properties of bio-asphalt are investigated, especially for flow-induced crystallization. There exists obvious flow-induced crystallization because bio-asphalt is rich in waxes that crystallize easily. Owing to the existence of excess biochar, bio-asphalt appears phase separation. A brief review of the effect of bio-oil and biochar on asphalt volatile organic compounds (VOCs) is presented. Research find that bio-oil/biochar are not only replenish the light components of asphalt, but also improve the flow-induced crystallization and phase separation of bio-asphalt. There exists synergistic effect of biochar and bio-oil in asphalt modification. Moreover, biochar can improve the durability of bio-oil modified asphalt, but excessive addition of biochar to bio-oil modified asphalt can cause phase separation. Adding an appropriate amount of bio-oil and biochar to asphalt can improve its high-temperature resistance, low-temperature crack resistance, and system compatibility.</div></div>","PeriodicalId":100830,"journal":{"name":"Journal of Road Engineering","volume":"4 4","pages":"Pages 421-432"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143286087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effectiveness of heat-reflective asphalt pavements in mitigating urban heat islands: A systematic literature review

Journal of Road Engineering

Pub Date : 2024-12-01 DOI: 10.1016/j.jreng.2024.04.008

Tracy Leh Xin Wong , Ewe Loon Lim , Mohd Rosli Mohd Hasan , Oumar Orozi Sougui , Abdalrhman Milad , Xin Qu

Urban heat island (UHI) effect is a growing concern in numerous cities worldwide, which increases urban temperatures. Conventional asphalt pavements are a major contributor to the issue, causing environmental and health concerns. To tackle this issue, the implementation of cool pavements such as heat-reflective asphalt pavements has been introduced. This systematic literature review (SLR) thoroughly examines prior research to assess the effectiveness of heat-reflective asphalt pavements in reducing UHI effects. This SLR was conducted in accordance with the preferred reporting items for systematic review and meta-analysis (PRISMA) guidelines to enhance data reliability and minimize bias. This review process involved establishing review protocol, formulating review questions, systematically selecting articles through identification, screening, eligibility, quality appraisal, and data abstraction and analysis from various databases such as Scopus, Web of Science (WoS), Wiley, Taylor Francis, and ScienceDirect. Three primary themes and nine sub-themes were derived from the three review questions. From the results, heat-reflective asphalt pavements effectively minimized the UHI effect. However, their efficiency varies depending on factors such as pavement types, paving location, and use of cool materials. A comprehensive analysis examined heat-reflective pavement's mechanisms, benefits, and drawbacks. This investigation aimed to enhance comprehension and establish a robust basis for future studies in this field.

{"title":"Effectiveness of heat-reflective asphalt pavements in mitigating urban heat islands: A systematic literature review","authors":"Tracy Leh Xin Wong , Ewe Loon Lim , Mohd Rosli Mohd Hasan , Oumar Orozi Sougui , Abdalrhman Milad , Xin Qu","doi":"10.1016/j.jreng.2024.04.008","DOIUrl":"10.1016/j.jreng.2024.04.008","url":null,"abstract":"<div><div>Urban heat island (UHI) effect is a growing concern in numerous cities worldwide, which increases urban temperatures. Conventional asphalt pavements are a major contributor to the issue, causing environmental and health concerns. To tackle this issue, the implementation of cool pavements such as heat-reflective asphalt pavements has been introduced. This systematic literature review (SLR) thoroughly examines prior research to assess the effectiveness of heat-reflective asphalt pavements in reducing UHI effects. This SLR was conducted in accordance with the preferred reporting items for systematic review and meta-analysis (PRISMA) guidelines to enhance data reliability and minimize bias. This review process involved establishing review protocol, formulating review questions, systematically selecting articles through identification, screening, eligibility, quality appraisal, and data abstraction and analysis from various databases such as Scopus, Web of Science (WoS), Wiley, Taylor Francis, and ScienceDirect. Three primary themes and nine sub-themes were derived from the three review questions. From the results, heat-reflective asphalt pavements effectively minimized the UHI effect. However, their efficiency varies depending on factors such as pavement types, paving location, and use of cool materials. A comprehensive analysis examined heat-reflective pavement's mechanisms, benefits, and drawbacks. This investigation aimed to enhance comprehension and establish a robust basis for future studies in this field.</div></div>","PeriodicalId":100830,"journal":{"name":"Journal of Road Engineering","volume":"4 4","pages":"Pages 399-420"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143286092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of indoor and field tests on asphalt pavement with inverted asphalt layers based on the vertical vibration compaction method

Journal of Road Engineering

Pub Date : 2024-12-01 DOI: 10.1016/j.jreng.2024.01.007

Yong Yi , Yingjun Jiang , Tian Tian , Yu Zhang , Jiangtao Fan , Chenfan Bai , Changqing Deng

An inverted asphalt pavement is created by reversing the sequence of the lower and middle layers in a conventional asphalt pavement. The lower layer is composed of material with larger particle size and lower asphalt content, which improves its ability to withstand deformation caused by rutting. On the other hand, the middle surface has a higher asphalt content, specifically designed to resist fatigue cracking. This paper examines the mechanical response of two pavement structures and investigates the potential of two measures, inverted asphalt pavement and asphalt mixture design by vertical vibration compaction method (VVCM), in reducing stresses and stress levels in asphalt pavements. Additionally, a large thickness rutting and fatigue test method was developed to study the rutting resistance and fatigue life of the pavement structures, and to construct rutting deformation and fatigue life prediction models. Finally, test sections were paved to verify the feasibility of the inverted pavement and VVCM materials. The findings show that inverted pavement and VVCM materials have a minimal impact on pavement stress, but can reduce pavement shear and tensile stress levels by up to 18%–25%. Furthermore, inverted pavement and VVCM materials have positive effects on improving the rutting resistance and fatigue life of asphalt pavements.

{"title":"Investigation of indoor and field tests on asphalt pavement with inverted asphalt layers based on the vertical vibration compaction method","authors":"Yong Yi , Yingjun Jiang , Tian Tian , Yu Zhang , Jiangtao Fan , Chenfan Bai , Changqing Deng","doi":"10.1016/j.jreng.2024.01.007","DOIUrl":"10.1016/j.jreng.2024.01.007","url":null,"abstract":"<div><div>An inverted asphalt pavement is created by reversing the sequence of the lower and middle layers in a conventional asphalt pavement. The lower layer is composed of material with larger particle size and lower asphalt content, which improves its ability to withstand deformation caused by rutting. On the other hand, the middle surface has a higher asphalt content, specifically designed to resist fatigue cracking. This paper examines the mechanical response of two pavement structures and investigates the potential of two measures, inverted asphalt pavement and asphalt mixture design by vertical vibration compaction method (VVCM), in reducing stresses and stress levels in asphalt pavements. Additionally, a large thickness rutting and fatigue test method was developed to study the rutting resistance and fatigue life of the pavement structures, and to construct rutting deformation and fatigue life prediction models. Finally, test sections were paved to verify the feasibility of the inverted pavement and VVCM materials. The findings show that inverted pavement and VVCM materials have a minimal impact on pavement stress, but can reduce pavement shear and tensile stress levels by up to 18%–25%. Furthermore, inverted pavement and VVCM materials have positive effects on improving the rutting resistance and fatigue life of asphalt pavements.</div></div>","PeriodicalId":100830,"journal":{"name":"Journal of Road Engineering","volume":"4 4","pages":"Pages 478-489"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143286085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A review of road 3D modeling based on light detection and ranging point clouds

Journal of Road Engineering

Pub Date : 2024-12-01 DOI: 10.1016/j.jreng.2024.04.009

Bin Yu, Yuchen Wang, Qihang Chen, Xiaoyang Chen, Yuqin Zhang, Kaiyue Luan, Xiaole Ren

Increasing development of accurate and efficient road three-dimensional (3D) modeling presents great opportunities to improve the data exchange and integration of building information modeling (BIM) models. 3D modeling of road scenes is crucial for reference in asset management, construction, and maintenance. Light detection and ranging (LiDAR) technology is increasingly employed to generate high-quality point clouds for road inventory. In this paper, we specifically investigate the use of LiDAR data for road 3D modeling. The purpose of this review is to provide references about the existing work on the road 3D modeling based on LiDAR point clouds, critically discuss them, and provide challenges for further study. Besides, we introduce modeling standards for roads and discuss the components, types, and distinctions of various LiDAR measurement systems. Then, we review state-of-the-art methods and provide a detailed examination of road segmentation and feature extraction. Furthermore, we systematically introduce point cloud-based 3D modeling methods, namely, parametric modeling and surface reconstruction. Parameters and rules are used to define model components based on geometric and non-geometric information, whereas surface modeling is conducted through individual faces within its geometry. Finally, we discuss and summarize future research directions in this field. This review can assist researchers in enhancing existing approaches and developing new techniques for road modeling based on LiDAR point clouds.

{"title":"A review of road 3D modeling based on light detection and ranging point clouds","authors":"Bin Yu, Yuchen Wang, Qihang Chen, Xiaoyang Chen, Yuqin Zhang, Kaiyue Luan, Xiaole Ren","doi":"10.1016/j.jreng.2024.04.009","DOIUrl":"10.1016/j.jreng.2024.04.009","url":null,"abstract":"<div><div>Increasing development of accurate and efficient road three-dimensional (3D) modeling presents great opportunities to improve the data exchange and integration of building information modeling (BIM) models. 3D modeling of road scenes is crucial for reference in asset management, construction, and maintenance. Light detection and ranging (LiDAR) technology is increasingly employed to generate high-quality point clouds for road inventory. In this paper, we specifically investigate the use of LiDAR data for road 3D modeling. The purpose of this review is to provide references about the existing work on the road 3D modeling based on LiDAR point clouds, critically discuss them, and provide challenges for further study. Besides, we introduce modeling standards for roads and discuss the components, types, and distinctions of various LiDAR measurement systems. Then, we review state-of-the-art methods and provide a detailed examination of road segmentation and feature extraction. Furthermore, we systematically introduce point cloud-based 3D modeling methods, namely, parametric modeling and surface reconstruction. Parameters and rules are used to define model components based on geometric and non-geometric information, whereas surface modeling is conducted through individual faces within its geometry. Finally, we discuss and summarize future research directions in this field. This review can assist researchers in enhancing existing approaches and developing new techniques for road modeling based on LiDAR point clouds.</div></div>","PeriodicalId":100830,"journal":{"name":"Journal of Road Engineering","volume":"4 4","pages":"Pages 386-398"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143286093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pavement skid resistance properties for safe aircraft operations

Journal of Road Engineering

Pub Date : 2024-12-01 DOI: 10.1016/j.jreng.2024.11.002

T.F. Fwa

Airport pavement engineers are required to maintain pavement skid resistance at a satisfactory level to minimize the likelihood of runway excursions. Runway overruns and skidding along rapid exit taxiways are the two most frequently encountered forms of runway excursion accidents. Currently only empirical statistical models based on historical accident data are available to predict the risks of runway excursions. All such models fail to account for the impacts of pavement skid resistance properties. Mechanistic solutions of the tire-fluid-pavement interaction problem are now available, and the impacts of pavement skid resistance properties on runway excursion accidents can now be quantitatively evaluated. This paper presents a state-of-the-art review of recent research developments on the topic. It highlights the Concept of Pavement Skid Resistance State which provides (i) a logical theoretical framework for mechanistic representation of tire-pavement skid resistance, and (ii) an approach for modeling of the physical process of aircraft skidding and hydroplaning. Next, runway excursion risk prediction models are presented for risk evaluation of aircraft hydroplaning, runway overruns, and rapid exit taxiway excursions. Also examined in detail mechanistically is the effectiveness of pavement grooving in reducing the risks of runway excursions. The review clearly confirms the capability of mechanistic approach in analyzing runway excursions for the purpose of enhancing safe aircraft operations on airport runways.

{"title":"Pavement skid resistance properties for safe aircraft operations","authors":"T.F. Fwa","doi":"10.1016/j.jreng.2024.11.002","DOIUrl":"10.1016/j.jreng.2024.11.002","url":null,"abstract":"<div><div>Airport pavement engineers are required to maintain pavement skid resistance at a satisfactory level to minimize the likelihood of runway excursions. Runway overruns and skidding along rapid exit taxiways are the two most frequently encountered forms of runway excursion accidents. Currently only empirical statistical models based on historical accident data are available to predict the risks of runway excursions. All such models fail to account for the impacts of pavement skid resistance properties. Mechanistic solutions of the tire-fluid-pavement interaction problem are now available, and the impacts of pavement skid resistance properties on runway excursion accidents can now be quantitatively evaluated. This paper presents a state-of-the-art review of recent research developments on the topic. It highlights the Concept of Pavement Skid Resistance State which provides (i) a logical theoretical framework for mechanistic representation of tire-pavement skid resistance, and (ii) an approach for modeling of the physical process of aircraft skidding and hydroplaning. Next, runway excursion risk prediction models are presented for risk evaluation of aircraft hydroplaning, runway overruns, and rapid exit taxiway excursions. Also examined in detail mechanistically is the effectiveness of pavement grooving in reducing the risks of runway excursions. The review clearly confirms the capability of mechanistic approach in analyzing runway excursions for the purpose of enhancing safe aircraft operations on airport runways.</div></div>","PeriodicalId":100830,"journal":{"name":"Journal of Road Engineering","volume":"4 4","pages":"Pages 361-385"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143286091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recycling of waste E-cigarette butts as engineered pelletized fibres for sustainable stone mastic asphalt

Journal of Road Engineering

Pub Date : 2024-12-01 DOI: 10.1016/j.jreng.2024.11.001

Yunfei Guo , Piergiorgio Tataranni , Giulia Tarsi , Filippo Balzano , Jiasheng Dai , Cesare Sangiorgi

The disposal of discarded E-cigarette butts (E-CBs) presents significant environmental challenges due to their detrimental impacts on ecosystems. To find an environmentally sustainable method for managing this waste, the potential for recycling E-CBs in asphalt pavements was investigated in this study. By focusing on the two primary components of E-CBs, namely cellulose fibre and polylactic acid (PLA), this research introduced a novel approach for recycling E-CBs in stone mastic asphalt (SMA) as a fibre additive in engineered pellet form. The prepared fibre pellets were directly added to aggregates to produce the SMA mixture. The resulting mixtures underwent a comprehensive evaluation through a series of standardized laboratory tests, including assessments of volumetric properties, indirect tensile strength (ITS), stiffness modulus, moisture susceptibility, and rutting resistance. The results were compared with SMA mixtures containing conventional cellulose fibres. Additionally, to examine the potential influence of PLA, a third mixture was prepared, incorporating both cellulose fibre and PLA. The findings indicate that the SMA using pelletized fibre can satisfy the technical specifications regarding the tests performed in this study, showing higher ITS and rutting resistance compared to the reference mixture. Moreover, the incorporation of PLA plastic reduced air void content and improved tensile strength, stiffness, and rutting resistance. This study highlights the potential for recycling E-CBs in asphalt mixtures, offering technical support for further development of sustainable recycling methods for this waste.

{"title":"Recycling of waste E-cigarette butts as engineered pelletized fibres for sustainable stone mastic asphalt","authors":"Yunfei Guo , Piergiorgio Tataranni , Giulia Tarsi , Filippo Balzano , Jiasheng Dai , Cesare Sangiorgi","doi":"10.1016/j.jreng.2024.11.001","DOIUrl":"10.1016/j.jreng.2024.11.001","url":null,"abstract":"<div><div>The disposal of discarded E-cigarette butts (E-CBs) presents significant environmental challenges due to their detrimental impacts on ecosystems. To find an environmentally sustainable method for managing this waste, the potential for recycling E-CBs in asphalt pavements was investigated in this study. By focusing on the two primary components of E-CBs, namely cellulose fibre and polylactic acid (PLA), this research introduced a novel approach for recycling E-CBs in stone mastic asphalt (SMA) as a fibre additive in engineered pellet form. The prepared fibre pellets were directly added to aggregates to produce the SMA mixture. The resulting mixtures underwent a comprehensive evaluation through a series of standardized laboratory tests, including assessments of volumetric properties, indirect tensile strength (ITS), stiffness modulus, moisture susceptibility, and rutting resistance. The results were compared with SMA mixtures containing conventional cellulose fibres. Additionally, to examine the potential influence of PLA, a third mixture was prepared, incorporating both cellulose fibre and PLA. The findings indicate that the SMA using pelletized fibre can satisfy the technical specifications regarding the tests performed in this study, showing higher ITS and rutting resistance compared to the reference mixture. Moreover, the incorporation of PLA plastic reduced air void content and improved tensile strength, stiffness, and rutting resistance. This study highlights the potential for recycling E-CBs in asphalt mixtures, offering technical support for further development of sustainable recycling methods for this waste.</div></div>","PeriodicalId":100830,"journal":{"name":"Journal of Road Engineering","volume":"4 4","pages":"Pages 468-477"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143286084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Review and prospect of four-point bending fatigue test of asphalt mixture

Journal of Road Engineering

Pub Date : 2024-12-01 DOI: 10.1016/j.jreng.2023.05.004

Yongjun Meng , Dichao Liu , Hongliu Rong , Xiaolong Yang

Fatigue cracking is one of the principal failure modes of asphalt pavement. The chief factors affecting the fatigue failure of asphalt pavement are load, environment, pavement structure and the fatigue resistance of asphalt mixture itself. Among them, the most important part is the research on the fatigue resistance of asphalt mixture, which has been studied deeply at home and abroad. This paper summarized some important research results and fatigue characterization parameters of the four-point bending fatigue test method in recent years, and suggested the future research direction of the four-point bending test. In the analysis and comparison of loading modes of four-point bending test, further research on various analysis methods is required. Researchers can appropriately refine the test method to account for nonlinear viscoelastic energy dissipation, as well as plastic and permanent deformation per cycle. The fatigue evaluation index of asphalt mixture can be comprehensively evaluated by four indicators, and can be combined with new fatigue characterization parameters in the future. It is suggested to develop a complete set of four-point bending fatigue test methods under various stress states consistent with the service state of asphalt pavement. This method can be used to eliminate the influences of environment, test condition and specimen size on the fatigue test results of asphalt mixture to improve the effectiveness and completeness of asphalt mixture fatigue performance characterization.

{"title":"Review and prospect of four-point bending fatigue test of asphalt mixture","authors":"Yongjun Meng , Dichao Liu , Hongliu Rong , Xiaolong Yang","doi":"10.1016/j.jreng.2023.05.004","DOIUrl":"10.1016/j.jreng.2023.05.004","url":null,"abstract":"<div><div>Fatigue cracking is one of the principal failure modes of asphalt pavement. The chief factors affecting the fatigue failure of asphalt pavement are load, environment, pavement structure and the fatigue resistance of asphalt mixture itself. Among them, the most important part is the research on the fatigue resistance of asphalt mixture, which has been studied deeply at home and abroad. This paper summarized some important research results and fatigue characterization parameters of the four-point bending fatigue test method in recent years, and suggested the future research direction of the four-point bending test. In the analysis and comparison of loading modes of four-point bending test, further research on various analysis methods is required. Researchers can appropriately refine the test method to account for nonlinear viscoelastic energy dissipation, as well as plastic and permanent deformation per cycle. The fatigue evaluation index of asphalt mixture can be comprehensively evaluated by four indicators, and can be combined with new fatigue characterization parameters in the future. It is suggested to develop a complete set of four-point bending fatigue test methods under various stress states consistent with the service state of asphalt pavement. This method can be used to eliminate the influences of environment, test condition and specimen size on the fatigue test results of asphalt mixture to improve the effectiveness and completeness of asphalt mixture fatigue performance characterization.</div></div>","PeriodicalId":100830,"journal":{"name":"Journal of Road Engineering","volume":"4 4","pages":"Pages 446-467"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143286088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Local calibration of JPCP transverse cracking and IRI models using maximum likelihood estimation

Journal of Road Engineering

Pub Date : 2024-12-01 DOI: 10.1016/j.jreng.2024.05.004

Rahul Raj Singh , Syed Waqar Haider , James Bryce

The calibration of transfer functions is essential for accurate pavement performance predictions in the Pavement-ME design. Several studies have used the least square approach to calibrate these transfer functions. Least square is a widely used simplistic approach based on certain assumptions. Literature shows that these least square approach assumptions may not apply to the non-normal distributions. This study introduces a new methodology for calibrating the transverse cracking and international roughness index (IRI) models in rigid pavements using maximum likelihood estimation (MLE). Synthetic data for transverse cracking, with and without variability, are generated to illustrate the applicability of MLE using different known probability distributions (exponential, gamma, log-normal, and negative binomial). The approach uses measured data from the Michigan Department of Transportation's (MDOT) pavement management system (PMS) database for 70 jointed plain concrete pavement (JPCP) sections to calibrate and validate transfer functions. The MLE approach is combined with resampling techniques to improve the robustness of calibration coefficients. The results show that the MLE transverse cracking model using the gamma distribution consistently outperforms the least square for synthetic and observed data. For observed data, MLE estimates of parameters produced lower SSE and bias than least squares (e.g., for the transverse cracking model, the SSE values are 3.98 vs. 4.02, and the bias values are 0.00 and −0.41). Although negative binomial distribution is the most suitable fit for the IRI model for MLE, the least square results are slightly better than MLE. The bias values are −0.312 and 0.000 for the MLE and least square methods. Overall, the findings indicate that MLE is a robust method for calibration, especially for non-normally distributed data such as transverse cracking.

{"title":"Local calibration of JPCP transverse cracking and IRI models using maximum likelihood estimation","authors":"Rahul Raj Singh , Syed Waqar Haider , James Bryce","doi":"10.1016/j.jreng.2024.05.004","DOIUrl":"10.1016/j.jreng.2024.05.004","url":null,"abstract":"<div><div>The calibration of transfer functions is essential for accurate pavement performance predictions in the Pavement-ME design. Several studies have used the least square approach to calibrate these transfer functions. Least square is a widely used simplistic approach based on certain assumptions. Literature shows that these least square approach assumptions may not apply to the non-normal distributions. This study introduces a new methodology for calibrating the transverse cracking and international roughness index (IRI) models in rigid pavements using maximum likelihood estimation (MLE). Synthetic data for transverse cracking, with and without variability, are generated to illustrate the applicability of MLE using different known probability distributions (exponential, gamma, log-normal, and negative binomial). The approach uses measured data from the Michigan Department of Transportation's (MDOT) pavement management system (PMS) database for 70 jointed plain concrete pavement (JPCP) sections to calibrate and validate transfer functions. The MLE approach is combined with resampling techniques to improve the robustness of calibration coefficients. The results show that the MLE transverse cracking model using the gamma distribution consistently outperforms the least square for synthetic and observed data. For observed data, MLE estimates of parameters produced lower SSE and bias than least squares (e.g., for the transverse cracking model, the SSE values are 3.98 vs. 4.02, and the bias values are 0.00 and −0.41). Although negative binomial distribution is the most suitable fit for the IRI model for MLE, the least square results are slightly better than MLE. The bias values are −0.312 and 0.000 for the MLE and least square methods. Overall, the findings indicate that MLE is a robust method for calibration, especially for non-normally distributed data such as transverse cracking.</div></div>","PeriodicalId":100830,"journal":{"name":"Journal of Road Engineering","volume":"4 4","pages":"Pages 433-445"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143286086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards green asphalt materials with lower emission of volatile organic compounds: A review on the release characteristics and its emission reduction additives 减少挥发性有机化合物排放的绿色沥青材料：释放特性及其减排添加剂综述

Journal of Road Engineering

Pub Date : 2024-09-01 DOI: 10.1016/j.jreng.2024.04.005

Xiwen Chang , Feng Wang , Rui Wu , Chen Wang , Yue Xiao

Recently, researchers in the road field are focusing on the development of green asphalt materials with lower emission of volatile organic compounds (VOCs). The characterization methodology of asphalt VOCs and the influencing factors on VOCs release have always been the basic issue of asphalt VOCs emission reduction research. Researchers have proposed a variety of asphalt VOCs characterization methodologies, which also have mutually irreplaceable characteristics. Asphalt VOCs volatilization is affected by many factors. In this study, asphalt VOCs characterization methodologies were summarized, including their advantages, disadvantages, characteristics and applicable requirements. Subsequently, the influencing factors of VOCs release, such as asphalt types and environment conditions, are summarized to provide theoretical support for the emission reduction research. The classification and mechanism of newly-development asphalt VOCs emission reduction materials are reviewed. The reduction efficiencies are also compared to select better materials and put forward the improvement objective of new materials and new processes. In addition, the prospects about development of VOCs release mechanism of asphalt materials during the full life cycle and feasibility research of high-efficiency composite emission reduction materials in the future were put forward.

近年来，道路领域的研究人员正致力于开发挥发性有机化合物（VOCs）排放量更低的绿色沥青材料。沥青 VOCs 的表征方法以及 VOCs 释放的影响因素一直是沥青 VOCs 减排研究的基本问题。研究人员提出了多种沥青 VOCs 表征方法，这些方法也具有相互不可替代的特点。沥青 VOCs 的挥发受很多因素的影响。本研究总结了沥青 VOCs 表征方法，包括其优缺点、特点和适用要求。随后，总结了沥青类型、环境条件等 VOCs 释放的影响因素，为减排研究提供理论支持。综述了新开发的沥青 VOCs 减排材料的分类和机理。通过对减排效率的比较，筛选出更好的材料，并提出了新材料和新工艺的改进目标。此外，还展望了沥青材料全生命周期 VOCs 释放机理的发展前景以及未来高效复合减排材料的可行性研究。

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引用次数: 0

Predictive modelling of volumetric and Marshall properties of asphalt mixtures modified with waste tire-derived char: A statistical neural network approach 使用废轮胎衍生炭改性的沥青混合物的体积和马歇尔特性的预测建模：统计神经网络方法

Journal of Road Engineering

Pub Date : 2024-09-01 DOI: 10.1016/j.jreng.2024.04.006

Nura Shehu Aliyu Yaro , Muslich Hartadi Sutanto , Noor Zainab Habib , Aliyu Usman , Abiola Adebanjo , Surajo Abubakar Wada , Ahmad Hussaini Jagaba

The goals of this study are to assess the viability of waste tire-derived char (WTDC) as a sustainable, low-cost fine aggregate surrogate material for asphalt mixtures and to develop the statistically coupled neural network (SCNN) model for predicting volumetric and Marshall properties of asphalt mixtures modified with WTDC. The study is based on experimental data acquired from laboratory volumetric and Marshall properties testing on WTDC-modified asphalt mixtures (WTDC-MAM). The input variables comprised waste tire char content and asphalt binder content. The output variables comprised mixture unit weight, total voids, voids filled with asphalt, Marshall stability, and flow. Statistical coupled neural networks were utilized to predict the volumetric and Marshall properties of asphalt mixtures. For predictive modeling, the SCNN model is employed, incorporating a three-layer neural network and preprocessing techniques to enhance accuracy and reliability. The optimal network architecture, using the collected dataset, was a 2:6:5 structure, and the neural network was trained with 60% of the data, whereas the other 20% was used for cross-validation and testing respectively. The network employed a hyperbolic tangent (tanh) activation function and a feed-forward backpropagation. According to the results, the network model could accurately predict the volumetric and Marshall properties. The predicted accuracy of SCNN was found to be as high value >98% and low prediction errors for both volumetric and Marshall properties. This study demonstrates WTDC's potential as a low-cost, sustainable aggregate replacement. The SCNN-based predictive model proves its efficiency and versatility and promotes sustainable practices.

本研究的目的是评估废轮胎衍生炭（WTDC）作为沥青混合料的可持续、低成本细集料替代材料的可行性，并开发统计耦合神经网络（SCNN）模型，用于预测用 WTDC 改性的沥青混合料的体积和马歇尔性能。该研究以 WTDC 改性沥青混合料（WTDC-MAM）的实验室体积和马歇尔性能测试数据为基础。输入变量包括废轮胎炭含量和沥青粘结剂含量。输出变量包括混合料单位重量、总空隙、沥青填充空隙、马歇尔稳定性和流动性。统计耦合神经网络用于预测沥青混合料的体积和马歇尔特性。在预测建模方面，采用了 SCNN 模型，其中包含一个三层神经网络和预处理技术，以提高准确性和可靠性。利用收集到的数据集，最佳网络结构为 2:6:5 结构，使用 60% 的数据对神经网络进行训练，另外 20% 的数据分别用于交叉验证和测试。该网络采用了双曲正切（tanh）激活函数和前馈反向传播。结果表明，该网络模型可以准确预测体积和马歇尔特性。结果发现，SCNN 的预测准确率高达 98%，并且对体积和马歇尔特性的预测误差较小。这项研究证明了 WTDC 作为低成本、可持续骨料替代品的潜力。基于 SCNN 的预测模型证明了其效率和多功能性，并促进了可持续发展实践。

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引用次数: 0