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Articles 62461 - 62490 of 1736078
Full-Text Articles in Entire DC Network
Determinants Of Job Performance In Forestry Organizations: A Structural Equation Modeling Approach On Technical Staff In The Mediterranean Region, Mehmet Pak, Ari̇f Okumuş
Determinants Of Job Performance In Forestry Organizations: A Structural Equation Modeling Approach On Technical Staff In The Mediterranean Region, Mehmet Pak, Ari̇f Okumuş
Turkish Journal of Agriculture and Forestry
This study aimed to explore the individual, institutional, and job-related factors influencing the job performance of technical staff in the Regional Forestry Directorates located in the Mediterranean Region of Türkiye. Data were collected through a mixed-method approach, including mostly face-to-face interviews, complemented by partially online questionnaires. Data were obtained from 650 technical staff, including regional directors, enterprise managers, section chiefs, and forest engineers. Structural equation modeling was applied, and variables were validated using confirmatory factor analysis. Model fit indices were within acceptable limits (e.g., RMSEA = 0.069, CFI = 0.838, GFI = 0.809). The results indicate that institutional factors had …
Board Of Directors Quarterly Meeting - Open Session Book 10/27/2025, Uc Law Sf
Board Of Directors Quarterly Meeting - Open Session Book 10/27/2025, Uc Law Sf
2025 Board of Directors Agenda and Materials
No abstract provided.
Space For New History: Stony Island Arts Bank, Seb Taylor
Space For New History: Stony Island Arts Bank, Seb Taylor
Digital Laboratory: Publisher of Internet Journal
The Stony Island Arts Bank (SIAB) in Southside Chicago was designed and founded as a piece of art itself, with the organizational structure being a museum of Black cultural production. This article examines how the institution constructs an epistemology of Blackness through its archival practices, community programming, and spatial claims on the South Side. Founded by artist Theaster Gates through the Rebuild Foundation, the SIAB positions institutional design as an art medium, operating in productive tension with orthodox museum methods. The permanent collections—including the Johnson Publishing Company archives and Frankie Knuckles vinyl collection—function as epistemological records of Black self-documentation unmediated …
Challenging Truth, Exploring Fluidity, And Reclaiming Bodily Autonomy Through Revisited Personal Narratives, Peyton Lane Sibert
Challenging Truth, Exploring Fluidity, And Reclaiming Bodily Autonomy Through Revisited Personal Narratives, Peyton Lane Sibert
Electronic Theses and Dissertations 2020 - Present
This dissertation explores and analyzes revisited personal narratives, which I define as layering perspectives or theorizing upon previously presented narratives. Specifically, I argue that revisited personal narratives are uniquely positioned to not only explore the intricacies of fluidity and truth within narrative but also deepen the insight into the perspectives of marginalized identities, thereby aiding in the deconstruction of cisheteronormativity and the reclaiming of autonomy—both bodily and narrative. Bodily autonomy refers to the freedom and ability to make choices about one’s own body and identity, including the right to not have one’s body violated, the right to access healthcare, the …
Single Local Injection Of 3s-Hmgb1 Enhances Early Bone Healing And Titanium Implant Osseointegration In Type 2 Diabetic Mice, Bhuvana L. Chandrashekar, Alexandra Arteaga, Evelin Rios, Jimena Mora, Gustavo P. Garlet, Danieli Rodrigues, Cláudia Cristina Biguetti
Single Local Injection Of 3s-Hmgb1 Enhances Early Bone Healing And Titanium Implant Osseointegration In Type 2 Diabetic Mice, Bhuvana L. Chandrashekar, Alexandra Arteaga, Evelin Rios, Jimena Mora, Gustavo P. Garlet, Danieli Rodrigues, Cláudia Cristina Biguetti
School of Podiatric Medicine Publications
Diabetes significantly impairs bone healing via several mechanisms, including sustained inflammation, oxidative stress, and poor osteogenic responses. Fully reduced isoform of High Mobility Group Box 1 with three serine substitutions (3S-HMGB1) has shown regenerative properties while being resistant to oxidative degradation.
Objective: This study evaluated the therapeutic potential of a single local injection of 3S-HMGB1 in early osseointegration under diabetic conditions in mice.
Methodology: A total of 48 male 129/Sv mice (24 non-diabetic [ND], 24 diabetic [D]) received titanium implants following maxillary first molar extraction. ND and D mice (n:12) were injected with either saline (control) or 3S-HMGB1 (0.75 mg/kg) …
Fluridone Use In Furrow-Irrigated Rice: Palmer Amaranth Control And Crop Response, Maria Carolina Souza, Jason K. Norsworthy, Pamela Carvalho-Moore, Amar S. Godar, Samuel B. Fernandes, Trenton L. Roberts, Thomas R. Butts
Fluridone Use In Furrow-Irrigated Rice: Palmer Amaranth Control And Crop Response, Maria Carolina Souza, Jason K. Norsworthy, Pamela Carvalho-Moore, Amar S. Godar, Samuel B. Fernandes, Trenton L. Roberts, Thomas R. Butts
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
Rice cultivated under furrow irrigation faces weed management challenges due to the aerobic conditions that favor the emergence of terrestrial weeds such as Palmer amaranth. Fluridone was recently registered for use in rice production, offering an alternative site of action for Palmer amaranth control. Four site-years of field experiments were conducted in 2022 and 2023 in furrow-irrigated rice to assess Palmer amaranth control and crop tolerance to fluridone applied preemergence alone or with various postemergence treatments. The experiment was a randomized complete block design with a split-plot arrangement and four replications. The whole-plot factor was the postemergence treatment, while the …
Chan V. Encalada
All Decisions
In a nonpayment proceeding, the landlord's petition was dismissed. After a trial on tenant's counterclaims, the court found for the tenant, awarding a $20,000 rent abatement for breach of warranty of habitability due to conditions like damaged floors, mold, lack of heat/cooking gas, and pests. The tenant also proved harassment, receiving $1,000 in compensatory damages and $35,000 in punitive damages, citing the landlord's omission of essential services demonstrating intent or malice, including physical assaults. The court also ordered the landlord to correct all outstanding DHPD violations.
Unraveling The Morphophysiological, Biochemical, And Yield Responses Of Maize Genotypes To Contrasting Nitrogen Conditions Using Multivariate Approaches, Muhammad Faheem Jan, Yu Lin, Waqas Liaqat, Muhammad Tanveer Altaf, Changzhuang Liu, Wang Shuai, Gönül Cömertpay, Israr Aziz, Önder Albayrak, Ming Li
Unraveling The Morphophysiological, Biochemical, And Yield Responses Of Maize Genotypes To Contrasting Nitrogen Conditions Using Multivariate Approaches, Muhammad Faheem Jan, Yu Lin, Waqas Liaqat, Muhammad Tanveer Altaf, Changzhuang Liu, Wang Shuai, Gönül Cömertpay, Israr Aziz, Önder Albayrak, Ming Li
Turkish Journal of Agriculture and Forestry
Genotypic variation plays a pivotal role in modulating the activity of nitrogen (N) assimilating enzymes, photosynthetic rate, N accumulation, plant growth, and yield. Despite this, the extent to which growth and N-assimilating enzymes exhibit differential responses across genotypes and their influence on yield and nitrogen use efficiency (NUE) remains inadequately explored. This study aimed to elucidate genetic variations among two inbred maize lines (Huang C and 178) and their hybrid (Huang C × 178) for key morphophysiological and biochemical traits under contrasting N conditions. Multivariate statistical methods, including principal component analysis (PCA) and structural equation modeling (SEM), were used to …
Adapting Northern Herbs For Desertification Control Around Poyang Lake, China, Haijing Xiao, Zhenwu Bian, Junyu Xu, Shimeng Li, Mengting Xiao, Min Guo, Xianglong Bu, Muhammad Rafiq, Chunsong Cheng
Adapting Northern Herbs For Desertification Control Around Poyang Lake, China, Haijing Xiao, Zhenwu Bian, Junyu Xu, Shimeng Li, Mengting Xiao, Min Guo, Xianglong Bu, Muhammad Rafiq, Chunsong Cheng
Turkish Journal of Agriculture and Forestry
Desertification poses a pressing global challenge, threatening both environmental stability and socioeconomic well-being, and it requires detailed monitoring of its dynamics and drivers to inform land restoration and sustainable development strategies. Around Poyang Lake, China’s largest freshwater lake, desertification has triggered profound ecological degradation and economic losses, intensified by human activities and climate change. This study investigates these challenges by evaluating an integrated revegetation approach that combines Beach vitex (V. rotundifolia) with nitrogen-fixing licorice (Glycyrrhiza spp.) to improve soil quality, stabilize environmental conditions, and foster sustainable land management. Field experiments examined the drought tolerance and soil enhancement capabilities of five …
Study On The Road Performance Of Recycled Asphalt Mixture With High Rap Percentage Based On Precision Separation Technology, Wang Haixiong, Tang Wei, Gao Xinglong, Fan Xiangyang, Yan Chunpeng
Study On The Road Performance Of Recycled Asphalt Mixture With High Rap Percentage Based On Precision Separation Technology, Wang Haixiong, Tang Wei, Gao Xinglong, Fan Xiangyang, Yan Chunpeng
Journal of China & Foreign Highway
The variability of recycled asphalt pavement (RAP) is one of the key factors limiting its high-content use in recycled asphalt mixtures (RAM). Although the RAP variability and clustering phenomenon can be effectively reduced by the precision separation (PS) technology, the road performance of RAM based on this technology requires further investigation. To address this issue, RAP materials were pre-processed using PS technology, followed by a comprehensive evaluation of the road performance of the RAM through rutting tests, freeze-thaw splitting tests, and beam bending tests. In addition, the influences of PS-RAP content and rejuvenator content on the road performance were analyzed. …
Workability And Improvement Evaluation Of Warm-Mixed High-Content, Sbs Asphalt Mixturesguo Yongjia, Jin Yong, Luo Chufan, Zhou Yusong, Zu Yuanzhe, Deng Xinyi, Song Yuhang
Workability And Improvement Evaluation Of Warm-Mixed High-Content, Sbs Asphalt Mixturesguo Yongjia, Jin Yong, Luo Chufan, Zhou Yusong, Zu Yuanzhe, Deng Xinyi, Song Yuhang
Journal of China & Foreign Highway
High-content SBS-modified asphalt has been widely used in high-grade highway pavement engineering due to its excellent mechanical properties and adaptability to heavy traffic. However, its application is hindered by high energy consumption and poor workability at elevated temperatures, which limits the development of green and efficient construction practices. In this study, on the basis of warm mix technology, a self-developed organic viscosi ty-reducing warm-mixed additive was incorporated to establish a warm-mixed asphalt mixture system with high-content SBS modification. With SMA-13 as the target gradation, the mixing and compaction workability was evaluated. A self-developed apparatus for mixing workability testing was used …
Crack Propagation Behavior Of Polyurethane Grouting Sma Asphalt Mixtures, Ji Guoqi, Ma Hui, Zheng Junqiu, Huang Yujie
Crack Propagation Behavior Of Polyurethane Grouting Sma Asphalt Mixtures, Ji Guoqi, Ma Hui, Zheng Junqiu, Huang Yujie
Journal of China & Foreign Highway
To reveal the influence me chanis m of polyurethane grouting on the crack propagation behavior of SMA-13 asphalt mixtures, this paper first conducted a semi-circular bending (SCB) test to validate the effectiveness of the PFC2D discrete element model, which was employed to simulate the microscopic responses of mixtures under different notch positions and grouting conditions. The analysis focused on load-displacement curves, crack propagation paths, crack number evolution, and force chain distribution characteristics. The results indicate that polyurethane grouting significantly increases the peak load and peak displacement of the specimens, thereby enhancing the fracture load-bearing capacity and deformation tolerance, with the …
Rheology And Microstructure Of Warm-Mixed High-Content Sbs Modified Asphalt, Wan Lei, Dong Fuqiang, Chen Jinzhen, Chen Jiaqiang, Song Yuhang, He Haonan
Rheology And Microstructure Of Warm-Mixed High-Content Sbs Modified Asphalt, Wan Lei, Dong Fuqiang, Chen Jinzhen, Chen Jiaqiang, Song Yuhang, He Haonan
Journal of China & Foreign Highway
With the gradual shift of high-grade highways in China from construction to maintenance, higher performance requirements have been placed on asphalt binders. High-content SBS modified asphalt has become an inevitable choice for both new pavement construction and maintenance. However, conventional high-content SBS modified asphalt suffers from high energy consumption, excessive carbon emissions, and poor construction workability. In this study, a self-developed warm-mixed additive was introduced into high-content SBS modified asphalt, and the process was optimized to obtain warm-mixed SBS modified asphalt. The effects of the additive on the asphalt performance and the warm-mix efficiency were evaluated in terms of viscosity-temperature …
Effect Of Mineral Particle Size Distribution Of Bra-Modified Asphalt On Its Rheological Performance, Zhushen Yuzhe, Dong Fuqiang, Zhu Xun, Zu Yuanzhe, Jin Yong
Effect Of Mineral Particle Size Distribution Of Bra-Modified Asphalt On Its Rheological Performance, Zhushen Yuzhe, Dong Fuqiang, Zhu Xun, Zu Yuanzhe, Jin Yong
Journal of China & Foreign Highway
The grinding and blending process significantly enhances the stability of the Buton rock asphalt (BRA) and asphalt blending system, but the influence mechanism of BRA's mineral particle size distribution on the rheological performance of modified asphalt is still unclear. To this end, this study prepared BRA-modified asphalt samples with different particle size distributions to systematically analyze the effect of BRA particle size distribution on the rheological performance of BRA-modified asphalt and then conduct high-and low-temperature rheological tests. Meanwhile, the fluorescence microscopy test was adopted to analyze the phase structure of BRA-modified asphalt under different particle size distributions. The results show …
Preparation And Road Performance Of Cold Patching Materials Modified By Polyurethane Prepolymer, Yang Wei, Zhai Xueguo, Guo Weixiong, Chi Haozhan
Preparation And Road Performance Of Cold Patching Materials Modified By Polyurethane Prepolymer, Yang Wei, Zhai Xueguo, Guo Weixiong, Chi Haozhan
Journal of China & Foreign Highway
Traditional cold asphalt mixtures present challenges such as inapplicability in humid environments and poor durability when used for repairing potholes in asphalt pavements. To address these issues, with polyurethane prepolymer (PUA), 70# base asphalt, and additives as raw materials, a cold patch asphalt base liquid with optimal comprehensive performance was developed using the simplex design and the ideal point method. Cold patching asphalt mixtures were also prepared, with pavement performance systematically evaluated. It indicates that the PUA content has the greatest influence on the low-temperature performance and tensile strength of the cold patching asphalt liquid. The effects of components on …
Research On Influence Of Ultra-Fine Iron Tailings Sand On Mechanical Properties Of Foam Concrete, Cheng Sensen, Li Hongzhen, Zhang Da, Chen Chen, Ma Guang, Zhou Yunbiao, Sun Chengyin, Feng Zhuangzhuang
Research On Influence Of Ultra-Fine Iron Tailings Sand On Mechanical Properties Of Foam Concrete, Cheng Sensen, Li Hongzhen, Zhang Da, Chen Chen, Ma Guang, Zhou Yunbiao, Sun Chengyin, Feng Zhuangzhuang
Journal of China & Foreign Highway
To reduce the production cost of foam concrete and increase the resource utilization rate of ultra-fine iron tailings sand (UITS), this study used UITS as an admixture to replace part of the cement with the same mass to prepare foam concrete. The working properties such as fluidity and water absorption rate, and the mechanical properties such as compressive strength and flexural strength of foam concrete were studied. The microscopic pore structure and hydration products were analyzed by scanning electron microscopy (SEM). The results show that when the UITS content ranges from 0% to 60%, with the increase of UITS content, …
Influence Of Ultra-Fine Iron Tailings Sand On Performance Of Cement-Stabilized Macadam Base, Meng Delong, Li Hongzhen, Chen Fushen, Wang Keran, Jiang Yuntao, Chen Lei, Feng Zhuangzhuang
Influence Of Ultra-Fine Iron Tailings Sand On Performance Of Cement-Stabilized Macadam Base, Meng Delong, Li Hongzhen, Chen Fushen, Wang Keran, Jiang Yuntao, Chen Lei, Feng Zhuangzhuang
Journal of China & Foreign Highway
To study the application potential of ultra-fine iron tailings sand (UITS) as a road base material, this paper conducted unconfined compressive strength (UCS) tests and freezing and thawing tests to systematically analyze the effects of UITS content and cement content on the mechanical properties and durability of cement-stabilized UITS. Additionally, the scanning electron microscope (SEM) was employed to examine the evolution process of the microstructure. The results indicate that the appropriate UITS content can effectively improve UCS, with the optimal strength under the 20% UITS content and comparable strength to that of conventional cement-stabilized macadam under the 30% content. Increasing …
Design And Performance Of Solvent-Based Regenerated Cold Feed For Fine Screening, Yan Chunpeng, Zhu Yaoting, Fan Xiangyang, Liu Bin, Yi Zhao
Design And Performance Of Solvent-Based Regenerated Cold Feed For Fine Screening, Yan Chunpeng, Zhu Yaoting, Fan Xiangyang, Liu Bin, Yi Zhao
Journal of China & Foreign Highway
To overcome the limitations of evaluatio n methods for the performance of cold patching asphalt mixtures, this paper systematically studied the pavement performance and its evaluation system of solvent-based cold patching asphalt mixtures using fully finely stripped and sieved reclaimed materials. Meanwhile, a multi-stage research approach was adopted to conduct an in-depth investigation. Firstly, the material ratio of the new solvent-based cold patching liquid was optimized based on the orthogonal test design method. Subsequently, an evaluation system covering key performance indicators and the corresponding technical standards was constructed. On this basis, the developed evaluation method was applied to conduct a …
Research And Application Progress Of Rap Plant-Mixed Hot Recycling Based On Oil-Stone Separation, Yu Xin, Gao Yuchao, Zhou Jie
Research And Application Progress Of Rap Plant-Mixed Hot Recycling Based On Oil-Stone Separation, Yu Xin, Gao Yuchao, Zhou Jie
Journal of China & Foreign Highway
Driven by global sustainable development strategies, China, as a major infrastructure nation, faces multiple pressures from resource constraints, environmental challenges, and its dual carbon goals. The efficient recycling of recycled asphalt pavement (RAP) has become a core issue for the green development of road engineering. Traditional recycling technologies struggle to overcome the 30% blending bottleneck due to issues such as high RAP agglomeration rates and significant gradation variability. Oil-stone separation technology deconstructs RAP to a near-virgin state through physical crushing, offering a novel pathway for high-ratio (≥30%) and even ultra-high-ratio (≥50%) RAP recycling. This paper critically reviewed systematic research on …
Mesoscopic Simulation Stu Dy On Fatigue Performance Of Asphalt Mixture Based On Discrete Element Method, Mao Quan, Zheng Junqiu, Ma Hui, Wang Min
Mesoscopic Simulation Stu Dy On Fatigue Performance Of Asphalt Mixture Based On Discrete Element Method, Mao Quan, Zheng Junqiu, Ma Hui, Wang Min
Journal of China & Foreign Highway
Asphalt pavement is prone to fatigue cracking during long-term service, which can lead to secondary diseases and weaken the structural durability. For in-depth revelation of the fatigue damage behavior of asphalt mixtures, in this paper, a semi-circular bending (SCB) mesoscopic model was established based on the discrete element method. The fatigue fracture behavior of three typical asphalt mixtures in Jiangsu Province's expressways, including SMA-13, SUP-20, and SUP-25, was simulated under different stress ratio conditions. The fatigue damage mechanism and evolution law of asphalt mixtures were analyzed from the aspects of fatigue life, crack propagation, and residual strength. The results show …
Evaluation Index Of Pavement Structural Cracks Based On Deflection Response, Zheng Junqiu, Ma Hui, Qiao Yuelai, Xu Ya, Zhou Jie, Xu Huan, Zhu Haoran
Evaluation Index Of Pavement Structural Cracks Based On Deflection Response, Zheng Junqiu, Ma Hui, Qiao Yuelai, Xu Ya, Zhou Jie, Xu Huan, Zhu Haoran
Journal of China & Foreign Highway
To accurately assess the impact of structural cracks on the strength of pavement structures and establish corresponding evaluation indicators based on deflection response, field tests were conducted on multiple sections of expressways in Jiangsu Province. A falling weight deflectometer was used to test a total of 15 measurement points within a 3-meter range on both sides of each crack. The center deflection values at each measurement point were plotted into curves, and three evaluation indicators for cracks, namely deflection range, maximum influence distance on one side of the crack, and influence area, were proposed based on the characteristics of the …
Mechanical And Durability Properties Of Flowable Solidified Soil Based On Waste Slurry From Pile Foundations, Li Hongzhen, Wu Shuxin, Che N Chen, Yin Shurui, Wang Luwen, Zhu Kongyou, Feng Zhuangzhuang
Mechanical And Durability Properties Of Flowable Solidified Soil Based On Waste Slurry From Pile Foundations, Li Hongzhen, Wu Shuxin, Che N Chen, Yin Shurui, Wang Luwen, Zhu Kongyou, Feng Zhuangzhuang
Journal of China & Foreign Highway
To address the challenge of pile foundation waste slurry disposal, this study proposes a resource utilization approach based on alkali activation technology, enabling rapid solidification of the waste slurry into a flowable solidified soil suitable for engineering backfill. An orthogonal experimental design was employed to determine the optimal mix ratio of the solidifying agent, identified as cement:slag:fly ash = 0.5:0.35:0.15, with NaOH accounting for 6% of the total mass. Based on this, the mechanical and durability properties of the solidified soil were systematically investigated. Results indicate that within a certain range, both unconfined compressive strength and splitting tensile strength increase …
Pavement Performance Prediction Based On Integrated Particle Swarm Optimization-Gray Back Propagation Neural Network Model, Li Xuelian, Huang Yan, Li Xiong
Pavement Performance Prediction Based On Integrated Particle Swarm Optimization-Gray Back Propagation Neural Network Model, Li Xuelian, Huang Yan, Li Xiong
Journal of China & Foreign Highway
The existing performance prediction model of asphalt pavements is limited by low accuracy and a lack of historical measured data. To address this issue and maximally optimize the pavement maintenance decision, a pavement performance prediction model integrating particle swarm optimization (PSO), gray model (GM), and back propagation neural network (BPNN) was proposed based on network management. Meanwhile, the model was compared with the GM (1, 1) model, support vector regression (SVR) model, BPNN model, and PSO-BPNN model. Then, the prediction accuracy of the models was evaluated by the mean absolute error (EMAE), the root mean square error (ERMSE), and the …
Quantification Of Activation Degree Of Aged Asphalt In Rap Fines Based On Recycled Mortar, Li Ning, Wang Ao, Tang Run, Li Jing, Li Jin
Quantification Of Activation Degree Of Aged Asphalt In Rap Fines Based On Recycled Mortar, Li Ning, Wang Ao, Tang Run, Li Jing, Li Jin
Journal of China & Foreign Highway
The oil-rich RAP fine material has a high proportion and significant asphalt content, offering considerable utilization value. However, in conventional production processes, it faces challenges such as difficult heating and insufficient activation of aged asphalt. To achieve deep regeneration, this study adopted the method of preparing recycled asphalt mortar to regenerate asphalt mixtures. However, there is currently a lack of quantitative evaluation methods for the activation degree of aged asphalt in this mortar regeneration process. Therefore, it is essential to establish an activation degree evaluation index to optimize the mortar preparation process parameters. The paper calibrated recycled asphalt mortar samples …
A Review Of Pavement Condition Evaluation Index Systems In China And Abroad, Chen Leilei, Yang-Li Wenyun, Li Wei, Muhammad Thlha, Qian Zhendong
A Review Of Pavement Condition Evaluation Index Systems In China And Abroad, Chen Leilei, Yang-Li Wenyun, Li Wei, Muhammad Thlha, Qian Zhendong
Journal of China & Foreign Highway
With the increasingly complex operating conditions of roads, it has become a consensus among countries to improve the accuracy and systematicness of maintenance decisions. Since the pavement condition evaluation index system is the core tool supporting the judgment of schemes, its construction method and applicable ability directly affect the maintenance efficiency and resource allocation level. Based on the construction logic of the index model, the scoring mechanism of grade division, and the conditions of road grade adaptation, the characteristics of the evaluation index systems in typical countries in China and abroad were compared and sorted out. The internal causes affecting …
Evaluation Indicators Of L Ayer-Specific Structural Strength For Asphalt Pavement Based On Tsd Deflection Slope Parameters, Chen Jun, Yin Long, Ren Zhongshan, Mei W Enjie, Zhai Rui, Zhu Haoran
Evaluation Indicators Of L Ayer-Specific Structural Strength For Asphalt Pavement Based On Tsd Deflection Slope Parameters, Chen Jun, Yin Long, Ren Zhongshan, Mei W Enjie, Zhai Rui, Zhu Haoran
Journal of China & Foreign Highway
Traffic speed deflectometer (TSD) has been widely used in pavement maintenance, yet an indicator system for identifying layer-specific structural strength remains lacking. On the basis of a three-dimensional finite element model incorporating viscoelastic damage, this study analyzed how surface damage density and the modulus of the base and subbase affect deflection slope. Two layer-sensitive indicators of structural strength were proposed:S10 (deflection slope 10 cm ahead of the load center) for characterizing the surface layer, and S30 (deflection slope 30 cm ahead of the load center) for reflecting the structural strength of the base layer. Simulation results show that S10 is …
Influence Of Reflective Cracks On The Mesoscopic Mechanical Behavior Of Asphalt Pavement Structures, Ma Hui, Ren Zhongshan, Wang Min
Influence Of Reflective Cracks On The Mesoscopic Mechanical Behavior Of Asphalt Pavement Structures, Ma Hui, Ren Zhongshan, Wang Min
Journal of China & Foreign Highway
To gain an in-depth understanding of the mechanical behavior of existing asphalt pavement structures affected by reflective cracks, a macro-meso coupled model of a typical semi-rigid base asphalt pavement was established based on a continuum-discrete coupling method. By incorporating reflective cracks with varying vertical lengths, the stress transfer paths, mesoscopic particle stress states, and displacement evolution of the pavement structure were analyzed. The results indicate that the coarse aggregate skeleton and the surrounding mortar collectively bear more than 75% of the traffic load, forming a critical load transfer system, and that a significant linear correlation exists between the vertical stress …
Grading Evaluation Method For Road Section-Level Structural Cracks Based On 3d Ground-Penetrating Radar, Zhou Lei, Yin Long, Wu Dongsheng, Xu Huan, Chang Wei, Zhu Haoran
Grading Evaluation Method For Road Section-Level Structural Cracks Based On 3d Ground-Penetrating Radar, Zhou Lei, Yin Long, Wu Dongsheng, Xu Huan, Chang Wei, Zhu Haoran
Journal of China & Foreign Highway
Structural cracks are widely distributed in current expressways, yet there is a lack of targeted evaluation methods. To achieve a quantitative assessment of structural cracking conditions in semi-rigid base asphalt pavement, this study first analyzed the development process of structural cracks based on coring tests. Subsequently, combined with non-destructive testing technology using 3D ground-penetrating radar and on-site coring experience, the morphological characteristics of structural cracks at various development stages were analyzed, and the cracks were classified into mild, moderate, and severe levels according to their development layers. On this basis, road section-level evaluation indicators, namely structural cracking spacing (SD) and …
Research On Enhancement Of Toughness Performance In Polyurethane-Modified Epoxy Asphalt, Liang Bo, Liao Xintao, Liao Wei, Jiang Hui, Qin Ruiming
Research On Enhancement Of Toughness Performance In Polyurethane-Modified Epoxy Asphalt, Liang Bo, Liao Xintao, Liao Wei, Jiang Hui, Qin Ruiming
Journal of China & Foreign Highway
To solve low toughness and high brittleness of epoxy asphalt under low-temperature conditions, in this study, polyether-type polyurethane (JMPU) and polyester-type polyurethane (JZPU) were employed to prepare modified epoxy asphalt. Firstly, the Brookfield viscosity test, infrared spectroscopy test, and fluorescence microscopy were utilized to characterize the curing process. The curing time and curing temperature of JMPU and JZPU modified epoxy asphalt were 3 h/140°C and 4 h/150°C, respectively. With styrene-butadiene-styrene block copolymer (SBS), a common modifier, as the control, the performance changes of epoxy asphalt before and after modification with different toughening agents were evaluated through mechanical tensile test, rheological …
Performance Of High-Elastic Modified Asphalt For Paving-Type Recycled Stress Absorption Layer, Li Jing, Liu Linlin, Zhu Qiyang, Li Ning, Li Long
Performance Of High-Elastic Modified Asphalt For Paving-Type Recycled Stress Absorption Layer, Li Jing, Liu Linlin, Zhu Qiyang, Li Ning, Li Long
Journal of China & Foreign Highway
To enhance the performance of recycled high-elastic modified asphalt binder and achieve high-quality and high-content utilization of RAP fine materials in the design of stress absorbing layers, a highly permeable recycled high-elastic modified asphalt (ZGT-R) was prepared by adding SBS modifier, light component oil, and penetrant to replenish the degraded SBS molecules and reduce intermolecular forces. The conventional properties, elastic recovery, degree of fusion between new and aged asphalt, rheological properties, and micro-modification mechanism of ZGT-R and ordinary recycled high-elastic modified asphalt before and after the addition of the rejuvenator were analyzed. The results show that, compared with the two …