Analysis Method And Evaluation Of Fatigue Life Of Welded Cable Clamp,
2023
CCCC First Highway Chongqing Wanzhou Expressway Co., Ltd., Chongqing 404100, China
Analysis Method And Evaluation Of Fatigue Life Of Welded Cable Clamp, Li Hongsheng, Zhang Zhixin, Xue Songling, Wang Zhicheng
Journal of China & Foreign Highway
In view of the practical application of welded cable clamps in Xintian Yangtze River Bridge, this paper adopted numerical calculation to analyze the fatigue performance of welded cable clamps and evaluate the fatigue life of the clamps. Firstly, a finite element model for Xintian Yangtze River Bridge was built to analyze the static characteristics of the bridge under constant and fatigue loads. Then, the geometric configuration of the welded cable clamps was analyzed and a numerical model of welded cable clamps was built, with the submodel technique adopted to analyze the mechanical properties of the clamps under different loads. Finally, …
Study On Influence Of Overcrossing Construction Of Xingquan Railway Lyugu No .2 Tunnel To Existing Chenba Tunnel Of Fuxia Railway,
2023
Fujian Railway Construction Co., Ltd., China Railway 24th Bureau Group Corporation Limited, Fuzhou, Fujian 350013, China
Study On Influence Of Overcrossing Construction Of Xingquan Railway Lyugu No .2 Tunnel To Existing Chenba Tunnel Of Fuxia Railway, Fan Dequan
Journal of China & Foreign Highway
To study the influence of tunnel crossing construction on the existing tunnel structures, this paper took the overcrossing construction of the existing Chenba tunnel of Fuxia railway of Xingquan railway Lyugu No. 2 tunnel as the research project. By adopting the numerical simulation method of finite element, it studied the change rules of the displacement field and stress field of the existing tunnels affected by the overcrossing construction of the new tunnels. The results show that the influencing range subject to the effect of Lyugu No. 2 tunnel’s excavation on the existing Chenba tunnel is roughly within the range of …
Risk Assessment Calculation Of Layered Surrounding Rock Tunnel Based On Combination Weight-Eahp-Ncm Model Theory,
2023
CCCC Second Highway Engineering Co., Ltd., Xi'an, Shaanxi 710065, China
Risk Assessment Calculation Of Layered Surrounding Rock Tunnel Based On Combination Weight-Eahp-Ncm Model Theory, Yang Yongbin, Wang Qing, Wang Yijun, Gao Weizheng, Li Yongliang
Journal of China & Foreign Highway
To accurately assess and calculate the structural stability of layered surrounding rock tunnels during construction, this paper firstly constructed a risk assessment index system for layered surrounding rock tunnels based on the consideration of factors of hydrogeology, structural surfaces, engineering, external forces, and topography and geomorphology. Based on the Delphi method (DELPHI) and entropy weight method (EWM), the combination of indicators was assigned. Based on the typical event samples and the mining of classical domains-joint domains of the assessment system, the extension analytic hierarchy process calculation model (EAHP) and normal cloud computing model (NCM) were built to assess the stability …
Optimization Design Of Highway Tunnel Inner Contour Based On Simu Lated Annealing Algorithm,
2023
China Communications Infrastructure Maintenance Group Co., Ltd., Beijing 100011, China
Optimization Design Of Highway Tunnel Inner Contour Based On Simu Lated Annealing Algorithm, Zhang Qingwei
Journal of China & Foreign Highway
To optimize the inner contour design of road tunnels, this paper regarded the inner contour design of a road tunnel as an optimization problem in certain conditions. By taking the area optimization as the objective, it introduced the simulated annealing algorithm to solve the problem based on the calculation model building of the inner contour of a single-centered circle with an inverted arch, with a program written for verification and analysis. The results show that the optimization design scheme is feasible and can provide an idea way for the inner contour design of road tunnels.
Review Of Material Composition And P Erformance Evaluation Of Cold Patch Asphalt Mixture,
2023
School of Traffic Engineering, Shenyang Jianzhu University, Shenyang, Liaoning 110168, China
Review Of Material Composition And P Erformance Evaluation Of Cold Patch Asphalt Mixture, Yang Yanhai, Zhu Guangxu, Yang Ye
Journal of China & Foreign Highway
To summarize the latest research achievements of cold patch asphalt mixtures at home and abroad, and to promote their development and application, this paper firstly introduced the development history of cold patch asphalt mixtures domestically and internationally, and focused on summarizing the classification and material selection of materials, as well as common mix ratio design methods. Secondly, it reviewed and analyzed the influencing factors of performance evaluation of the mixtures. Finally, such problems as the strength effect mechanism and the link between the material and performance, and the future research directions were combined to establish a unified and effective evaluation …
Study On Low Temperature Performance Of Asphalt Mixture Under Salt Freezing Condition,
2023
Key Laboratory of Civil Engineering Structure and Mechanics, Inner Mongolia University of Technology,
Hohhot, Inner Mongolia 010051, China
Study On Low Temperature Performance Of Asphalt Mixture Under Salt Freezing Condition, Song Yunlian, Gao Pan, Jiang Yu
Journal of China & Foreign Highway
To investigate the ice-melting ability of snow-melting agents and the effect of different salt freezing conditions on low temperature performance of asphalt mixtures, this paper carried out the ice-melting ability test, beam bending test and beam bending creep test. The results show that under the temperature of -20℃ and concentration 30% or more of the snow-melting agent, the ice can be melted. However, the melting ice quality is small. In terms of melting ice quality, the melting ability of the P-type snow-melting agent is better than that of the H-type snow-melting agent. Under the temperature of -10‒0℃, the recommended concentration …
Research On Performance Simulation Of Previous Concrete Considering Characteristics Of Void Structures,
2023
Shandong Luqiao Group Co., Ltd., Jinan, Shandong 250014, China
Research On Performance Simulation Of Previous Concrete Considering Characteristics Of Void Structures, Zheng Shuai, Dan Jingsong, Han Weiwei, Lv Yigang, He Jie, Pei Fucai
Journal of China & Foreign Highway
Pervious concrete contains a large number of macroscopic voids. To analyze the influence of the void structures on the mechanical properties of pervious concrete, this paper adopted the random void method to build a simulation model of pervious concrete, and study the effect of the characteristics of the void structures on the force properties. Firstly, two kinds of pervious concrete specimens with two void content levels were made indoor, and then the specimens were cut after curing and molding. Next, image enhancement and threshold segmentation were conducted on the section images of the cut surfaces, and two-dimensional digital images of …
Study On Frost Resistance And Pore Structure Of Nano-Sio 2 Modified Pavement Concrete Under Fatigue Load,
2023
Guangxi Transport Vocational and Technical College, Nanjing, Guangxi 530000, China
Study On Frost Resistance And Pore Structure Of Nano-Sio 2 Modified Pavement Concrete Under Fatigue Load, Zhou Xuexiang, Zheng Wenshi, Wu Cong
Journal of China & Foreign Highway
To improve the frost resistance of concrete pavement under fatigue load, this paper simulated the freeze-thaw damage of concrete pavement under vehicle load by indoor fatigue loading and alternating freeze-thaw cycling test. Meanwhile, it designed the bending tensile test to test the residual bending tensile strength of nano SiO2-modified pavement concrete after freezing and thawing, and adopted the mercury injection method to test the microscopic pore structures of concrete. Additionally, by employing the electron microscope, the change rules of pores in the concrete under the action of fatigue load were observed, and the effect of nano SiO2 dosage, the number …
Influence Of Natural Environment On The Serviceability Of Emulsified Asphalt Cold Recycled Mixture,
2023
Sichuan Vocational and Technical College of Communications, Chengdu, Sichuan 613000, China
Influence Of Natural Environment On The Serviceability Of Emulsified Asphalt Cold Recycled Mixture, Yang Puxin
Journal of China & Foreign Highway
To improve the early serviceability of emulsified asphalt cold recycled mixtures, this paper studied the effect of curing conditions on the mechanical strength and stability of emulsified asphalt cold recycled mixtures by conducting indoor tests. The results show that in the same test conditions, the indoor emulsified asphalt cold recycled mixture can better characterize the serviceability of practical projects. Compared to the indoor specimen mixture, the stability and cleavage strength of field mixture core samples are increased by an average of 5.5% and 10.7% respectively. Under the curing time of no less than 7 d, the stability, cleavage strength and …
Experimental Study On Recycled Brick Powder Foam Concrete Based On Slurry Substitution Method,
2023
School of Civil Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
Experimental Study On Recycled Brick Powder Foam Concrete Based On Slurry Substitution Method, Liao Shixian, Huang Lei
Journal of China & Foreign Highway
Foam concrete is a kind of porous lightweight building material characterized by sound insulation and noise reduction, heat insulation and fire resistance, heat preservation and frost resistance. However, it has defects such as low strength, high porosity and poor integrity, thus limiting its wide application in the field of building materials. Recycled brick powder can be prepared from construction waste of clay bricks and has certain volcanic ash activity. Meanwhile, the mechanical properties of foam concrete can be improved by employing waste bricks as an admixture in cement-based composite materials. In view of the problems of the cement substitution method, …
Study On Mix Design And Performance Of Permeable Concrete Considering Sand Ratio And Aggregate To Binder Ratio,
2023
Henan Puwei Expressway Co., Ltd., Puyang, Henan 457000, China
Study On Mix Design And Performance Of Permeable Concrete Considering Sand Ratio And Aggregate To Binder Ratio, Wei Yazhou, Ji Rongqing
Journal of China & Foreign Highway
Considering the effect of the sand ratio and aggregate to binder ratio, this paper improved the traditional mix ratio design method-volumetric method, and investigated the influence of the sand ratio, aggregate to binder ratio, and maintenance method on the mechanical properties and permeability coefficient of pervious concrete based on the improved method. The results show that under the sand ratio of 15%, the compressive strength of concrete is significantly increased and the permeability is not affected. When the aggregate to binder ratio is 3.0‒3.1, the compressive strength and permeability coefficient of the concrete can be both considered. Additionally, compared to …
Application Of Dry Sbs Modification Technology In Yanhai Highway,
2023
Jiangsu Eastern Expressway Management Co., Ltd., Yancheng, Jiangsu 224000, China
Application Of Dry Sbs Modification Technology In Yanhai Highway, Zhang Han, Meng Chunlin, Zhao Mingfang, Lu Chuanzhong, Ji Guoqi
Journal of China & Foreign Highway
Dry SBS-modified asphalt pavement technology is to produce SBS-modified asphalt mixtures by adding specific SBS modifiers, which aims to solve the performance degradation of SBS-modified asphalt in transportation and storage. By relying on the coastal highway repair projects, this paper compared the effects of different dry SBS mixing contents on the test results by the indoor dry SBS and matrix asphalt compatibility test and asphalt mixture performance evaluation test. Meanwhile, based on the test results, the recommended dry SBS mixing content for the coastal highway upper layer milling and resurfacing maintenance project was proposed and applied on a large scale …
Experimental Study On Mechanical Properties Of Steel-Polypropylene Mixed Fiber Rubber Concrete,
2023
Shanxi Transportation Survey & Design Institute Co., Ltd., Taiyuan, Shanxi 030031, China
Experimental Study On Mechanical Properties Of Steel-Polypropylene Mixed Fiber Rubber Concrete, Qiu Jiandong
Journal of China & Foreign Highway
Waste rubber materials can be recycled to obtain rubber aggregates, which can be employed in cement concrete products. This paper carried out mechanical performance tests on ordinary concrete and rubber concrete (rubber substitution rate of 20%) with different fiber combinations (doped MS, co-doped PP, and mixed MS-PP), and mainly examined the slump, density, compressive strength, modulus of elasticity, split tensile strength, and rupture strength of the concrete. The results show that the relevant performance indexes decrease significantly after 20% of rubber aggregate is added to the concrete. However, the mechanical performance of ordinary concrete and rubber concrete with the combination …
Analysis Of Light Reflection And Automobile Exhaust Degradation Effect Of Asphalt Pavement Coating,
2023
Yan'an Highway Administration Bureau, Yan'an, Shaanxi 716000, China
Analysis Of Light Reflection And Automobile Exhaust Degradation Effect Of Asphalt Pavement Coating, Shang Wenyong, Zhou Zheng, Chen Jun
Journal of China & Foreign Highway
To compare the light reflection and exhaust degradation effect of common road coating fillers, this paper prepared three kinds of road surface coatings with Nano-TiO2, Nano-ZnO, and Micro-TiO2 as fillers respectively. Meanwhile, the reflectivity tests of the coatings with different mixing contents of fillers were conducted by adopting a self-developed light reflectivity tester to determine the optimal mixing content of fillers. Under the optimal mixing content of fillers, the reflectivity of three kinds of coating asphalt mixtures was tested to compare the light reflectivity effect of Nano-TiO2, Nano-ZnO and Micro-TiO2. Additionally, a self-developed exhaust concentration analyzer was utilized to test …
Study On Effect Of Nanomodified Additives On Properties Of Concrete Mixtures During Winter Season,
2023
Guangxi Road Construction Engineering Group Co., Ltd., Nanjing, Guangxi 530001, China
Study On Effect Of Nanomodified Additives On Properties Of Concrete Mixtures During Winter Season, Li Yulin, Liang Hongjie, Liang Junlin, Rong Hongliu, Yang Xiaolong
Journal of China & Foreign Highway
To solve the difficult placement of small structures on highways caused by the decreasing workability of cement concrete construction in winter seasons, this paper developed a nanomodified additive to investigate its effect on the performance of cement concrete. Sulfonate naphthaleneformaldehyde (SNF), nanoSiO2, rosin soap (WSR) and sodium nitrate (NaNO3) were formulated into a variety of additives in different ratios and mixing contents to prepare cement concrete, with the fluidity, segregation and compressive strength studied. The results show that the optimal ratio (mass) of nanomodified additives is SNF:0.4%, nanoSiO2:0.1%, WSR:0.05%, and NaNO3:4.0%. The fluidity, segregation and compressive strength of the concrete …
Comparison Of Specifications For Highway Safety Audi Ts Of China ， The United States ， And Australia,
2023
College of Civil Engineering, Hunan University, Changsha, Hunan 410082, China
Comparison Of Specifications For Highway Safety Audi Ts Of China ， The United States ， And Australia, Li Jie, Han Huanhuan, Li Jia, Ren Yabo, Gong Ruiming
Journal of China & Foreign Highway
Traffic safety is one of the three major problems of transportation. To build a transportation power, China has proposed the call of “facilitating the transportation development from pursuing the speed and scale to paying more attention to quality and safety”, and improving the audit specifications of road safety is an important basis for increasing the transportation safety level. This paper firstly introduced the background where China, the United States and Australia issued the audit specifications of road safety, and then compared the differences between the three countries in the aspects of the audit process for road safety, audit indexes and …
Application Of Bim Forward Design In Complex Three-Dimensional Traffic Design Stage,
2023
CCCC First Highway Consultants Co., Ltd., Xi'an, Shaanxi 710075, China
Application Of Bim Forward Design In Complex Three-Dimensional Traffic Design Stage, Wang Bo, Zhu Xinghu, Pei Wangjian, Ge Puta
Journal of China & Foreign Highway
To improve the accuracy and efficiency of complex three-dimensional traffic design, and provide basic digital data for the whole life cycle, this paper researched and investigated the application of BIM technology in the complex three-dimensional traffic design stage by taking the convergence project of the Qianhai section of Shenzhen Coastal Expressway and Nanping Expressway in Guangdong as a case study. Meanwhile, it put forward the BIM forward design schemes for the fields of roads, bridges, and tunnels, carried out secondary development, and built the three-dimensional parametric model, with the design results optimized. Additionally, design analysis and application were conducted to …
Research On Interchange Reconstruction Design Of Minxiao Hub,
2023
CCCC Second Highway Consultants Co., Ltd., Wuhan, Hubei 430056, China
Research On Interchange Reconstruction Design Of Minxiao Hub, Hu Tian, Tan Ximing, Yi Xuebin, Wei Hui
Journal of China & Foreign Highway
Based on the design of the Minxiao hub interchange, this paper analyzed the technical problems of frequent traffic accidents after the initial reconstruction of Minxiao hub interchange, and put forward corresponding reconstruction suggestions. In the interchange design details, the design points about the dual lanes adopting single lanes and speed change lanes only put forward the distance requirement of 60 m for the transition sections, but whether the gradual changes of the travel lanes and hard shoulders are completed in the same road section or not is not clarified. The initial reconstruction of Minxiao hub interchange is designed to complete …
Research On A Hub Interchange Scheme Under Special Terrain Conditions,
2023
Sichuan Communication Surveying & Design Institute Co., Ltd., Chengdu, Sichuan 610000, China
Research On A Hub Interchange Scheme Under Special Terrain Conditions, Wang Jie, He Yajun
Journal of China & Foreign Highway
By combining the study process and conclusion of the interchange scheme of the Lugao hub as an important node of G4216 Jinyang-Ningnan Expressway Project, this paper discussed the ideas and methods of selecting the hub interchange shape under complex terrains and high functional requirements. It aimed to provide certain references for the design of hub interchange schemes in special Y-shaped terrain conditions. The Lugao hub interchange location is deeply cut by the Jinsha River and its branches, with narrow valley bottoms, extremely steep cross slopes, and harsh engineering construction conditions. Meanwhile, in the limited space, the specific requirements of the …
Analysis Of Factors Affecting Construction And Demolition Waste Reduction In Egypt,
2023
The British University in Egypt
Analysis Of Factors Affecting Construction And Demolition Waste Reduction In Egypt, Ayman Ahmed Ezzat Othman, Ahmed Osama Daoud, Obas John Ebohon, Ali Bayyati
Architectural Engineering
Construction projects are associated with construction and demolition waste (CDW) generated at different stages. In Egypt’s case, the CDW problem has become a significant challenge, and the need to find sustainable solutions is overwhelming. Based on recent investigations in the literature, it was found that six main factors are affecting CDW reduction (CDWR) as follows: (1) waste-efficient materials procurement measures; (2) waste-efficient materials procurement models; (3) green materials procurement approach; (4) legislation; (5) culture & behaviour; and (6) awareness. In this study, a representative sample of Egyptian construction firms was screened to (1) investigate the applicability and effectiveness of CDWR …
