Simulation Study On Flame Retardant Effect Of Warm‐Mixed Flame Retardant Pavement In Highway Tunnel,
2023
Changsha University of Science and Technology
Simulation Study On Flame Retardant Effect Of Warm‐Mixed Flame Retardant Pavement In Highway Tunnel
Journal of China & Foreign Highway
In order to obtain the flame retardant effect of the warm-mixed flame retardant asphalt pavement in highway tunnels, based on the finite element method and thermodynamics theory, the thermal analysis module of Ansys finite element software was used to study the flame retardant effect of ordinary asphalt pavement, flame retardant asphalt pavement, and warm-mixed flame retardant asphalt pavement under different fire scales. The maximum temperature of the three types of pavement increased with the increase in the fire scale. Under any fire scale, the flame retardant effect of the warm-mixed flame retardant asphalt pavement was increased by 4.9%–8.5% compared with …
Uniaxial Shear Test And Mesoscopic Numerical Simulation Of Cemental Soil Based On Pfc2d Method,
2023
Nanning Vocational and Technical University, Nanning, Guangxi 530003, China
Uniaxial Shear Test And Mesoscopic Numerical Simulation Of Cemental Soil Based On Pfc2d Method, Yang Zhihui, Li Shanhua
Journal of China & Foreign Highway
Uniaxial compression tests were carried out on stable soft soil samples with different cement contents. Based on the test results, a mesoscopic numerical simulation of PFC2D discrete element particle flow during soil sample deformation was conducted to analyze the mechanical behavior and displacement field distribution of cement soil after failure. The results show that with the increase in cement content, the uniaxial shear strength and elastic modulus of the solidified soft soil sample show an exponential function and rise, and the failure strain shows a quadratic function with the increase in cement content. The mechanical parameters and stress-strain curves of …
Study On The Effect Of Quicklime On The Properties Of Cold Mix Asphalt,
2023
Jiangxi Communications Investment Group Co., Ltd., Nanchang, Jiangxi 330025, China;
Study On The Effect Of Quicklime On The Properties Of Cold Mix Asphalt, Liu Tao, Yi Ming, Song Tao
Journal of China & Foreign Highway
The low initial strength of cold mixed asphalt mixture leads to the delay of traffic opening time, and the large void ratio leads to poor water stability and other problems, which seriously hinder the development of cold mixed environment-friendly construction mode. In this paper, based on the principle that the heat of quicklime in the presence of water promotes the rapid loss of water in the cold mixed mixture, the mixing test and cohesion test of the MS-3 slurry cold mixed asphalt mixture with quicklime were carried out to explore the influence of quicklime on the demulsification time and cohesion. …
Study On Dynamic Allocation Optimization Of Highway Pavement Maintenance Funds,
2023
Jiangxi Ganyue Expressway Engineering Co., Ltd., Nanchang, Jiangxi 330069, China
Study On Dynamic Allocation Optimization Of Highway Pavement Maintenance Funds, Zou Yi
Journal of China & Foreign Highway
The conflict between the lack of maintenance funds and the growth of maintenance demand restricts the improvement of highway pavement technologies. In this paper, the state space of pavement maintenance demand was defined by the technical condition of the pavement, and the state of demand under different maintenance measures was designed as a Markov decision process. The dynamic allocation optimization model of highway pavement maintenance funds was established, and the corresponding genetic algorithm was designed. Finally, an example was given to simulate the optimized model. The results show that the Markov decision process can dynamically allocate highway pavement maintenance funds, …
Influence Factors Of Deicing And Thaw Performance Of Asphalt Mixture With Low Freezing Point,
2023
Sichuan Highway Planning, Survey, Design, and Research Institute Ltd, Chengdu, Sichuan 611141, China; 2. Research and Development Center of Transport Industry of Technologies, Materials and Equipments of Highway Construction and Maintenance, Chengdu, Sichuan 611130, China; 3. Sichuan Provincial Laboratory of Pavement Structural Materials and Maintenance Engineering, Chengdu, Sichuan 611130, China
Influence Factors Of Deicing And Thaw Performance Of Asphalt Mixture With Low Freezing Point, Zhou Shuiwen, Lin Fang, Zhang Xiaohua, Zhang Lingbo, Jiang Haoqiu
Journal of China & Foreign Highway
The conductivity test was used to study the release law of thawing and deicing components. The freezing test was used to study the cooling law of the mixture, and the thawing rate test was used to study the thawing and deicing performance. The results show that the release of thawing and deicing components of materials with a low freezing point is temperature-dependent, and the release at the high temperature is 3.49–3.77 times that at the low temperature. The granular materials tend to dissolve in water, which results in the release rate of thawing and deicing components faster than that of …
Research On Design Process Of Toll Interchange‐Expressway In The Area Of Funiu Mountain,
2023
Henan Provincial Communications Planning & Design Institute Co., Ltd., Zhengzhou, Henan 450000, China
Research On Design Process Of Toll Interchange‐Expressway In The Area Of Funiu Mountain, Zhang Jie, Yang Qing, Chai Xiaolong
Journal of China & Foreign Highway
Currently, the expressways under construction in Henan Province are mainly concentrated in the Funiu Mountain area in the west, such as Yaoshan–Luanchuan–Xixia Expressway, Xixia–Xichuan Expressway, Yingchi–Luanchuan Expressway, and Luanchuan–Lushi Expressway. These projects are characterized by complex terrain conditions, difficult design, large-scale engineering, and a cluster of long tunnels and grand bridges. Under such complex conditions, how to arrange the interchange reasonably and ensure the optimal project plan becomes the key point of successful project design. This paper summarized the typical characteristics of toll interchange in Funiu Mountain area in recent years and put forward the design process of design preparation, …
Experimental Analysis On Recycling And Mechanical Properties Of Waste Cement,
2023
Chongqing University of Posts and Telecommunications, Chongqing 400065, China
Experimental Analysis On Recycling And Mechanical Properties Of Waste Cement, Chen Liang
Journal of China & Foreign Highway
In order to recycle waste cement, construction waste cement materials were collected in the laboratory, and they were crushed, ground, and heat treated to facilitate reuse. Then, the waste cement was combined with the commonly used active fly ash admixture to prepare a new cement material for test analysis. The results show that the new cement material produced by industrial by-product, fly ash and waste cement material is feasible. A small amount of construction waste cement material (about 5%) can increase the 28-day compressive strength of cement by more than 50%, and the compressive strength of the prepared building material …
Experimental Study On Characteristics And Stability Of Different Aged Steel Slag Aggregate,
2023
Guangxi Transportation Science and Technology Group Co., Ltd., Nanning, Guangxi 530007, China; 2. Changsha University of Science & Technology, Changsha, Hunan 410114, China
Experimental Study On Characteristics And Stability Of Different Aged Steel Slag Aggregate, Zhang Hongri, Wang Guiyao, Feng Jian, Lan Tianzhu, Wu Tao
Journal of China & Foreign Highway
Steel slag aggregate has good building material properties, but the utilization rate of steel slag in road engineering is low at present. In this paper, the chemical composition, basic physical and mechanical indexes, f⁃CaO, f⁃MgO, pulverization rate, CRB expansion rate, and other indexes of open-air aged steel slag aggregate in Fangchenggang, Guangxi Province for 0, 6, and 12 months were studied. The results show that the physical and mechanical properties of steel slag aggregate basically meet the requirements of road base materials and subgrade fillers, but the indexes of f⁃CaO, pulverization rate, and CRB expansion rate of steel slag aggregate …
Study On Effect Of Fiber Stabilizers On Water Temperature Cycle Damage Resistance Of Drainage Asphalt Mixtures,
2023
Nanchang Institute of Technology, Nanchang, Jiangxi 330099, China; 2. Tianquan County Transportation Bureau, Ya’an, Sichuan 625500, China
Study On Effect Of Fiber Stabilizers On Water Temperature Cycle Damage Resistance Of Drainage Asphalt Mixtures, Liu Fuming, Wu Di, He Qingde, Yang Zhiping
Journal of China & Foreign Highway
In order to study the effect of fiber stabilizer on the water temperature cycle damage resistance of drainage asphalt mixture, drainage asphalt mixture without fiber stabilizer and with wood fiber, polyester fiber, and basalt fiber, respectively, were compared through tests. By standard dispersion test and immersed dispersion test, the anti-spalling ability of the mixture was analyzed. Under the same asphalt condition, the standard dispersion loss of the drainage asphalt mixture was reduced to different degrees after adding fiber stabilizer, which could increase the anti-spalling property of the drainage asphalt mixture to some extent. The splitting, indirect tensile, and rutting tests …
Analysis On Pavement Early Damage Characteristics And Influence Factors Of Baiyin Section Of National Highway 109,
2023
School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
Analysis On Pavement Early Damage Characteristics And Influence Factors Of Baiyin Section Of National Highway 109, Shi Fuzhou, Han Fei, Tang Dandan, Liu Wuwen, Zhang Jinyuan
Journal of China & Foreign Highway
In order to explore the cause of early damage of highway asphalt pavement in Baiyin area of Gansu Province, this paper analyzed the main factors that affected the performance of asphalt pavement and investigated the use of asphalt pavement in this area, climate environment, and traffic conditions. By taking Baiyin section of National Highway 109 as an example, the specific data were deeply analyzed. Based on the investigation of pavement use, the situation and decay rule of local asphalt pavement were summarized. According to the investigation of the climate environment, the influence of solar radiation, temperature difference, and other conditions …
Review And Outlook For Long‐Life Asphalt Pavement,
2023
Shandong Institute of Transportation Science, Jinan, Shandong 250102, China; 2. Key Laboratory of Highway Maintenance Technology and Transportation Industry, Jinan, Shandong 250102, China
Review And Outlook For Long‐Life Asphalt Pavement, Xu Xizhong, Wei Jincheng, Yan Xiangpeng, Zhang Zhengchao
Journal of China & Foreign Highway
In order to make clear the research status of long-life asphalt pavement in China and abroad, this paper summarized the development characteristics, pavement structure, design index, pavement material, dynamic response analysis of pavement, fatigue performance estimation, and other hot issues of long-life asphalt pavement, compared the structural characteristics of long-life asphalt pavement in various countries, and summarized the results of pavement material design and optimization. The research progress of the dynamic response of asphalt pavement was summarized, and the development direction of long-life asphalt pavement was discussed. The comprehensive analysis shows that long-life asphalt pavement is the development trend of …
Study On Modulus Characteristics Of Semi‐Flexible Pavement,
2023
Yancheng Highway Administration Office, Yancheng, Jiangsu 224005, China
Study On Modulus Characteristics Of Semi‐Flexible Pavement, Cai Yubin, Gong Minghui, Xiong Zijia, Deng Cheng, Peng Gang, Zhang Lihua, Hong Jinxiang
Journal of China & Foreign Highway
Semi-flexible pavement has the advantages of good bearing capacity and strong shear deformation resistance and is an effective means to solve the rutting disease of intersections, bus stops, and other sections. However, due to the difference in mechanical properties, semi-flexible pavement can not completely refer to the design method of cement concrete pavement or asphalt concrete pavement, and one of the important tasks of establishing a design system suitable for semi-flexible pavement is to analyze the material modulus characteristics of pavement. In this paper, the dynamic modulus, indirect tensile stiffness modulus, and rebound modulus of laboratory forming and coring specimens …
Field Experiment On Deep Response Of Slope Subjected To Different Rainfalls In Plateau Mountainous Area Of Northwest Yunnan,
2023
Yunnan Institute of Transportation Planning and Design, Kunming, Yunnan 650041, China; 2. Yunnan Communications Investment & Construction Group Co., Ltd., Kunming, Yunnan 650103, China; 3. Yunnan Key Laboratory of Digital Transportation, Kunming, Yunnan 650000, China
Field Experiment On Deep Response Of Slope Subjected To Different Rainfalls In Plateau Mountainous Area Of Northwest Yunnan, Chen He, Lu Zhiqiang, Li Guo, Chen Zhengyu
Journal of China & Foreign Highway
In order to investigate the characteristics and mechanism of deep response of slopes subjected to different rainfalls in plateau mountainous area of Northwest Yunnan, remote real-time monitoring devices were deployed to carry out slope prototype field tests, analyze the effects of natural rainfalls in different forms and intensities on deep displacement and groundwater level changes, and put forward suggestions for landslide monitoring and early warning. The results show that the characteristics of heavy rainfall, steep slope, and rock fragmentation during flood season can induce the frequent fluctuation of groundwater level in the deeper part of the slope, which results in …
Study On Reliability Of Special Shaped Arch Bridge With Spatial Three‐Cable‐Plane Inclined Suspenders Under Live Load,
2023
College of Transportation Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China
Study On Reliability Of Special Shaped Arch Bridge With Spatial Three‐Cable‐Plane Inclined Suspenders Under Live Load, Zhu Liming, Shen Kun, Wang Xingyun
Journal of China & Foreign Highway
Because the structure of a special shaped arch bridge is complicated, there are few studies on the fatigue reliability of its suspender. In order to study the fatigue reliability of the suspender of complex shaped arch bridges under live load, the actual project of a 157 m through-type steel arch bridge with three-cable-plane inclined suspenders with special shaped tie bars was studied. The fatigue reliability formula based on Weibull distribution was applied to analyze the fatigue reliability of the suspender under different live load conditions. The results show that the design live load ensures a higher safety reserve and meets …
Study On Pavement Structure Performance Based On Polymer Alloy Material For Steel Deck Pavement,
2023
Chongqing Jiaotong University, Chongqing 400074, China
Study On Pavement Structure Performance Based On Polymer Alloy Material For Steel Deck Pavement, Yang Bo, He Zhaoyi, Liu Pan, Li Kai, Sheng Xingyue, Li Lu
Journal of China & Foreign Highway
Based on the characteristics of light weight and high strength of polymer alloy materials, three new steel bridge deck pavement structures based on polymer alloy materials were proposed in this paper. Their high temperature performance, interface bonding performance, fatigue resistance, and skid resistance were investigated, and the performance performance was compared with that of traditional pavement structures. The test results show that the thickness of the pavement layer has a greater influence on the high temperature performance of “polymer alloy material + high-elasticity modified asphalt concrete SMA10” but has less influence on the high temperature performance of “polymer alloy material …
Influence Of Curvature Radius On Mechanical Properties Of Small And Medium Span Continuous Rigid Frame Bridge During Construction Stages,
2023
Pengzhou City Construction Investment Group Co., Ltd., Chengdu, Sichuan 611930, China
Influence Of Curvature Radius On Mechanical Properties Of Small And Medium Span Continuous Rigid Frame Bridge During Construction Stages, Xie Yangfu, Ye Yuansheng, Gui Shuirong, Yang Yu
Journal of China & Foreign Highway
In order to study the mechanical properties and the influence of curvature radius on the mechanical properties of curved rigid frame bridge constructed by span-by-span assembly method, this paper took the continuous rigid frame bridge with a two-box standard section (35 + 35 + 35) m of Hongdu Overpass in Nanchang City as the engineering background. By changing the curvature radius, the influence of curvature radius on the mechanical properties of small- and medium-span continuous rigid frame bridges constructed by span-by-span assembly method during construction was studied. The results show that the mechanical properties such as the main beam stress, …
Research On Vibration Reduction Measures Of Short‐Hole Blasting For Pile Group Foundation Of Bridge,
2023
Guizhou Highway Engineering Group Co., Ltd., Guiyang, Guizhou 550008, China
Research On Vibration Reduction Measures Of Short‐Hole Blasting For Pile Group Foundation Of Bridge, Long Lidun, Ji Zhongyan, Li Shaofang, Zhou Xu
Journal of China & Foreign Highway
In the construction of pile hole blasting of group pile foundation of bridges, due to the small clear distance between piles, the blasting vibration will have adverse effects on the wall protection of adjacent pile holes and the poured pile core concrete. Measures thus should be taken to control the seismic wave vibration velocity. In view of the inapplicability of conventional blasting vibration reduction measures such as reducing charge and setting isolation ditch in the construction of pile group foundation of the bridge, this paper proposed vibration reduction measures such as setting isolation holes and using air bags to replace …
Installation Construction Technology Of Composite Girder Cable‐Stayed Bridge Superstructure In Deep‐Cutting Gorge,
2023
CCCC Second Harbor Engineering Company Ltd., Wuhan, Hubei 430040, China
Installation Construction Technology Of Composite Girder Cable‐Stayed Bridge Superstructure In Deep‐Cutting Gorge, Ren Lei, Lu Liang, Dong Zhengliang
Journal of China & Foreign Highway
In view of the installation problems of superimposed beam cable-stayed bridge across the deep canyon, this paper studied the superimposed beam lifting, transport on beam, and superimposed beam installation and proposed three kinds of lifting technology with tower truss crane, beam lifting door crane, and large tower crane, as well as two kinds of installation technology including piecemeal assembly by full rotating deck crane and whole segment assembly truss deck crane. It also made a relative comparative analysis, solving the difficulty in vertical lifting on such bridges and providing a reference for the construction of the same type of cable-stayed …
Analysis Of Influence Parameters Of Steel Corrugated Plate‐Concrete Composite Arch Culvert,
2023
Shanxi Transportation Planning, Survey and Design Institute Co., Ltd., Taiyuan, Shanxi 030012, China
Analysis Of Influence Parameters Of Steel Corrugated Plate‐Concrete Composite Arch Culvert, Zhang Haijun
Journal of China & Foreign Highway
In order to explore the parameter effect of a composite arch culvert with corrugated steel plate and concrete, based on the engineering background of a composite arch culvert, the influence rules of four parameters, namely fill height, pipe diameter, wall thickness, and uneven settlement, on the stress and deformation of the arch culvert were analyzed based on the control variable method. The results show that the deformation and stress of the arch culvert are positively correlated with the fill height h and pipe diameter R. When h < 25 m, the deformation and stress increase linearly with the increase in the fill height, and when h > 25 m, the deformation and stress increase in a curve form. When R …
Research And Analysis On Controlled Blasting Demolition Of Continuous Thin‐Walled Box Ribbed Arch Bridge,
2023
Beijing Municipal Construction Engineering Co., Ltd., Beijing 100083, China
Research And Analysis On Controlled Blasting Demolition Of Continuous Thin‐Walled Box Ribbed Arch Bridge, Ma Shaojun, Chen Huibin, Chai Wendong, Zhang Chunquan, Wang Yuan
Journal of China & Foreign Highway
The 1st bridge of the Jialing River in Pengan County is erected over the Jialing River, a tributary of the Yangtze River. Due to earthquakes and perennial high load operation, the overall technical condition is “Class Ⅴ”, which cannot meet the requirements of the design load grade. This bridge is the longest highway bridge dismantled in Sichuan Province. Its structure is a multi-span continuous thin-walled box ribbed arch bridge. In addition, there are obvious diseases, so the demolition is difficult, and the safety risk is great. For the demolition of the bridge by controlled blasting, numerical simulation, shaped charge cutting …
