Experimental Study On Shear Performance Of Uhpc‑Nc Interface,
2024
College of Civil Engineering , Hunan University , Changsha ,Hunan 410082 , China ;Guangdong Communication Planning & Design Institute Group Co., Ltd., Guangzhou ,Guangdong 510507 , China
Experimental Study On Shear Performance Of Uhpc‑Nc Interface, Wan Zhiyong, Chen Jianping, He Shaohua, Huang Xu, Sun Xiangdong
Journal of China & Foreign Highway
Ultra-high performance concrete （UHPC） has great application prospects in engineering structure reinforcement.The reliability of the bonding properties at the interface between the new UHPC reinforcement layer and the old concrete structure is critical for ensuring the serviceability of the reinforced structures.To determine the influence of different interface treatments on the bonding properties at the interface between the UHPC and normal concrete （NC），six Z-shaped UHPC-NC bonding specimens were designed，and the bonding properties of the UHPC-NC with three different kinds of interface，namely smooth，chisel，chisel + reinforced，were investigated.In addition，nonlinear finite element models for the concrete interface were established to determine the distribution law of …
Application Of Sequential Quadratic Programming Method In Cable Force Adjustment Of Cable‑Stayed Bridges,
2024
School of Civil Engineering and Transportation , South China University of Technology , Guangzhou , Guangdong 510641 , China
Application Of Sequential Quadratic Programming Method In Cable Force Adjustment Of Cable‑Stayed Bridges, Xu Yufeng, Zhu Mengyang, Chen Si, Xie Yunfei
Journal of China & Foreign Highway
When the construction of a cable-stayed bridge enters the completion stage，due to various factors，there is a certain error between the actual alignment and internal force of the structure and the theoretical completion state，and it is usually necessary to adjust the cable force.In order to calculate the cable force adjustment of a cable-stayed bridge in the adjustment stage，a method based on an influence matrix and sequential quadratic programming was proposed to solve the cable force adjustment.A large-span hybrid girder cable-stayed bridge was taken as the background，and the alignment and internal force response values of the structure with varying cable units were …
Protection Design Of Middle Piers Of Overpass Bridges Based On Double Protection Concept,
2024
Shandong Hi-Speed Company Limited , Jinan , Shandong 250014 , China
Protection Design Of Middle Piers Of Overpass Bridges Based On Double Protection Concept, Lyu Sizhong, Wang Xin, Guo Jianmin, Liu Siyuan, Li Yuxin, Yang Fuyu
Journal of China & Foreign Highway
The collision accident types of middle piers of overpass bridges were summarized and analyzed，and it was proven that anti-collision and anti-scratching were two important requirements of pier protection.Then，the new concept of double protection and corresponding technical schemes were put forward.The first protection adopted the way of setting concrete barriers or ship-shaped elevating members on the periphery of the pier to prevent vehicles from impacting the pier，and the second protection used the self-wrapped steel plate or aluminum foam plate to prevent vehicles from scratching the pier.The safety of the pier protection structure schemes was verified by computer simulation and unit test，and …
Research On Yolov 5‑Ganomaly Joint Algorithm For High‑Strength Bolt Detection,
2024
School of Civil Engineering , Changsha University of Science & Technology ，Changsha ,Hunan 410144 ,China
Research On Yolov 5‑Ganomaly Joint Algorithm For High‑Strength Bolt Detection, Xie Haibo, Zhu Weijun, Zhang Bi2, Zhang Dahai
Journal of China & Foreign Highway
High-strength bolt loosening detection of bridges faces problems such as heavy workload，small targets，many anomalies，and difficult collection.Therefore，this paper proposed a semi-supervised deep learning model，which could obtain the bolt loosening detection model even with a small number of negative samples and solve the problem of unbalanced model training samples.The accuracy of the YOLOv 5-CT model for bolt target detection reached 98.33%.By preprocessing bolt data，the reconstruction ability of bolt images by the Ganomaly model was improved.When the hidden space vector value was 100，the model had the highest SAUC and the best discriminant performance.In the model test stage，the threshold of abnormal fraction was set …
Experimental Study On Effect Of Temperature On Bound Water Adsorption And Deformation Of High Liquid Limit Soil,
2024
Hainan Transportation Engineering Construction Bureau , Haikou , Hainan 570208 , China
Experimental Study On Effect Of Temperature On Bound Water Adsorption And Deformation Of High Liquid Limit Soil, Zi Yinhui, Shen Xuning, Zhang Hao, Zhang Rui, Li Lu
Journal of China & Foreign Highway
In order to study the effect of temperature change on the bound water content adsorbed by high liquid limit clay and the deformation law of high liquid limit clay embankment，the high liquid limit clay in Hainan Province was selected as the primary research object and compared with the low liquid limit sand in Hunan Province.The effect of temperature on the bound water content adsorbed by high liquid limit clay was explored through a nuclear magnetic resonance test.In addition，the effect of temperature on the deformation of high liquid limit clay embankments was analyzed through the consolidation test with a temperature-controlled consolidometer.The …
Temperature And Strain Development Characteristics Of Tunnel Concrete Based On Double Grating Sensors,
2024
Quzhou Traffic Design Co ., Ltd., Quzhou ,Zhejiang 324000 , China
Temperature And Strain Development Characteristics Of Tunnel Concrete Based On Double Grating Sensors, Fang Jianping, Zhang Mengxi, Yao Xiaonan
Journal of China & Foreign Highway
In order to better prevent tunnel concrete from cracking，the development law of concrete temperature and strain was studied.Based on the connection project of Sanjiang Middle Road in the Smart New City of Quzhou，a data acquisition system was established to monitor concrete temperature and strain on site.The defects of the traditional method that the temperature and strain monitoring are insensitive，and the monitoring data is discontinuous were overcome.In addition，the high-performance double grating temperature-strain sensor was used to simultaneously monitor the temperature and strain at the same position，and the temperature compensation method was used to overcome the influence of the ambient temperature on …
Properties And Mechanism Of Reclaimed Asphalt Based On Sbs Structure Repair,
2024
School of Traffic & Transportation Engineering , Changsha University of Science & Technology , Changsha , Hunan 410114 , China
Properties And Mechanism Of Reclaimed Asphalt Based On Sbs Structure Repair, Feng Xinjun, Yang Hongyang, Xiao Honghai, Zhu Ziqiang
Journal of China & Foreign Highway
At present，the common asphalt regenerant is used for treating the aged styrene-butadiene-styrene （SBS） modified asphalt in China，which fails to repair the SBS cross-networking structure，resulting in the poor regeneration effect of the aged SBS modified asphalt.In this study，a new reactive regenerator containing a structural repair agent，extractive oil，plasticizer，solubilizer，and a small amount of SBS was used to regenerate the aged SBS modified asphalt.The conventional properties and rheological properties of reclaimed SBS modified asphalt were studied by three index tests，Brookfield viscosity test，dynamic shear rheological test，and low temperature bending rheological test.Then，a fluorescence microscope and infrared spectrometer were used to study the regeneration mechanism of the …
Research On General Drawing Design Technologies For Cover Culverts In Hunan Province,
2024
Hunan Provincial Communications Planning ,Survey&Design Institute Co ., Ltd., Changsha , Hunan 410008 , China
Research On General Drawing Design Technologies For Cover Culverts In Hunan Province, Peng Xiaoming, Li Yukun, Hu Qiong, Xia Yutao
Journal of China & Foreign Highway
As one of the main structures of highways，a culvert has the characteristics of large quantity and wide range.Affected by design and construction factors，engineering diseases of culverts have been prominent for a long time.With the extensive promotion of the green highway construction concept and the continuous updating of technical standards and design specifications，the original general drawing of culverts fails to meet the needs of the sustainable and healthy development of highway construction under the new situation.Hunan Provincial Communications Planning，Survey & Design Institute has conducted extensive and in-depth investigation and research on the key technologies of highway culvert design and prepared a …
Transverse Deformation And Countermeasures Of Cantilever Assembly Of Super‑Wide Steel Box Girder Of Zhongshan Bridge Over Shenzhen‑Zhongshan Link,
2024
Guangdong Hualu Transportation Technology Co ., Ltd., Guangzhou , Guangdong 510420 , China
Transverse Deformation And Countermeasures Of Cantilever Assembly Of Super‑Wide Steel Box Girder Of Zhongshan Bridge Over Shenzhen‑Zhongshan Link, Zhou Yu
Journal of China & Foreign Highway
In view of the transverse deformation of super-wide steel box girders of cable-stayed bridges during the cantilever assembly，the construction characteristics of the two-way eight-lane super-wide steel box girder of Zhongshan Bridge over Shenzhen-Zhongshan Link were analyzed，and the main causes of the transverse deformation during the cantilever assembly of the super-wide steel box girder were investigated.According to the matching height difference adjustment technology in the cantilever assembly construction of the wide box girder in China and abroad，this paper innovatively proposed a matching process of straight beam locking + initial tension of hanging cables，which better solved the problem of poor transverse deformation …
Fume Emission And Environmental Impact Assessment In Fresh Asphalt Tunnel Construction Site,
2024
Jiangluo Branch of Guangdong Province Highway Construction Co ., Ltd. , Guangzhou ,Guangdong 510000 , China
Fume Emission And Environmental Impact Assessment In Fresh Asphalt Tunnel Construction Site, Deng Wenti, Zou Guilian, Zhang Yuan, Yu Liang, Xie Huiduan
Journal of China & Foreign Highway
In view of the random monitori ng of fum e emission in asphalt pavement construction sites，combined with the engineering application of fresh asphalt in the construction of hot-mixed and hot-spread asphalt pavement in large and long tunnels for fume emission reduction，the fume collection and evaluation method of asphalt pavement construction sites were studied，and the emission reduction effect of fresh asphalt was evaluated.The Summa tanks were used to collect the asphalt fume at different positions of the paver，and the asphalt fume was quantitatively analyzed by gas chromatograph-mass spectrometer （GC-MS）.The results show that compared with the non-fresh asphalt from the same source，the …
Stability Analysis Of High And Steep Bank Slope Of Jinqi Bridge On Wudang‑Changshun Expressway,
2024
China Railway First Survey and Design Institute Group Co ., Ltd., Xi’an，Shaanxi 710043 , China
Stability Analysis Of High And Steep Bank Slope Of Jinqi Bridge On Wudang‑Changshun Expressway, Wang Hao
Journal of China & Foreign Highway
Jinqi Bridge on the Wudang-Changshun Expressway in Guizhou Province crosses the Maotiao River，and the poor geological conditions such as dangerous rock mass and collapse accumulation body on the bank slope of the river are relatively developed，which seriously affects the site selection and safety of the bridge.In order to study the stability of the high and steep bank slope of the bridge，the paper explored the main poor geological conditions in the bridge site through a comprehensive air-ground investigation.By means of numerical analysis，InSAR，and other technologies，the movement range of dangerous rock mass on the bank slope was quantitatively evaluated.The stability and deformation mode …
Shear Creep Characteristics And Slope Deformation Mechanism Of Siliceous Slate,
2024
Hubei Communications Planning and Design Institute Co . Ltd., Wuhan , Hubei 430051 , China ;Hubei Provincial Engineering Research Center for Highway Geological Hazard Informatization and Intelligent Prevention and Control , Wuhan , Hubei 430051 , China
Shear Creep Characteristics And Slope Deformation Mechanism Of Siliceous Slate, Li Jian, Yan Liangyu, Yu Kaibing, Li Ming, Yan Tingzhou, Zhao Jia
Journal of China & Foreign Highway
To study the time-dependent creep effect of siliceous slate and the deformation and failure evolution law of high slope，in this paper，the shear creep test of indoor rock mass was carried out to plot the shear creep duration curves of siliceous slate under different normal stresses，the shear displacement-time curve，and the creep rate-time curve under different normal loads and shear loads.The average creep rate and shear load variation of siliceous slate were studied，and the long-term shear strength parameters of siliceous slate were determined by the steady-state creep rate method.The results show that in the creep test，the sensitivity of cohesion is significantly greater …
Rotating Wheel Tracking Tester And Torsional Resistance Of Asphalt Mixtures,
2024
Petroleum Processing Research Center , East China University of Science and Technology , Shanghai 200237，China ;Shanghai Urban Construction NichiReki Special Asphalt Co ., Ltd., Shanghai 2004 36，China
Rotating Wheel Tracking Tester And Torsional Resistance Of Asphalt Mixtures, Yao Hongru, Wang Qiang, Lu Guangyan, Zhou Xiaolong
Journal of China & Foreign Highway
Asphalt pavement is prone to pla stic deformation and aggregate raveling when it is in torsion.At present，there is no standard test method and equipment to evaluate the torsional resistance of asphalt mixtures.In order to study the effective evaluation method for the torsional shear resistance of asphalt mixtures，this paper introduced the structures and working principles of three kinds of equipment developed in Japan.The torsional resistance of five typical asphalt mixtures was evaluated by rotating wheel tracking tests，and factors affecting the torsional resistance of asphalt mixtures were analyzed.The results show that the types of structures and binders of asphalt mixtures have an …
Construction Of Carbon Emission Monitoring And Management System For Commercial Vehicles,
2024
Research Institute of Highway Ministry of Transport ，Beijing 100088，China
Construction Of Carbon Emission Monitoring And Management System For Commercial Vehicles, Chang Zheng, Song Yan, Ji Meichen, Liu Yuqing, Wang Jing
Journal of China & Foreign Highway
To construct a comprehensive carbon emission monitoring and management system for commercial vehicles，firstly，this article described the background and significance of carbon emission monitoring and management of commercial vehicles and summarized the research in relevant fields in China and abroad.Then，this article expounded on the carbon emission monitoring system for commercial vehicles，which covered three major levels：monitoring target layer，monitoring implementation layer，and monitoring summary layer，so as to achieve comprehensive and accurate carbon emission monitoring.Finally，combined with the carbon emission monitoring data of commercial vehicles，this article put forward a carbon emission management system for commercial vehicles based on data information，including carbon emission data sharing and opening，data …
Experimental Study On Reinforced Geogrid Of Construction And Demolition Wastes Based On Dic Technology,
2024
China Road & Bridge Corporation , Beijing 100011 , China
Experimental Study On Reinforced Geogrid Of Construction And Demolition Wastes Based On Dic Technology, Tan Peng, Li Hai, Li Xiangping, Gu Fan, Zhang Junhui
Journal of China & Foreign Highway
In order to control differential settlement caused by new and old subgrade connections after expressway reconstruction and expansion，this paper proposed a layered treatment structure for the loose steps of the old road with high water content.A layer of construction and demolition waste was laid on the step surface of the old road to wrap the geogrid.The treatment effect was compared with that of sand wrapping and lime mixing，and the digital speckle correlation （DIC） was used to observe the reinforced influence zone，so as to determine the thickness of different layers of the subgrade wrapped by construction and demolition wastes.The particle rotation …
Working Performance Of Rigid Airfield Runway Considering Influence Of Cavity Depth,
2024
School of Transportation Science and Engineering , Civil Aviation University of China , Tianjin 300300 , China ;Shandong Engineering Research Center of Civil Aviation Digital Innovation , Taian , Shandong 271000 , China
Working Performance Of Rigid Airfield Runway Considering Influence Of Cavity Depth, Dai Xuan, Li Zhao, Cai Jing, Li Yue, Liu Guoguang, Qi Lin
Journal of China & Foreign Highway
In order to analyze the influence of cavity depth on runway safety，a numerical simulation was carried out using the finite difference method.A total of 208 sets of different working conditions were designed by taking into account factors such as different aircraft types，runway dimensions，and cavity depth and area.Based on the runway life model considering the exponential decay of the structural condition，an analytical method was proposed to evaluate the impact of the cavity on the runway life.The results show that the bending and stress of the runway increase gradually with the increase in the cavity depth，but the growth rate is getting slower …
Intelligent Compaction Of Asphalt Pavement And Its Key Influencing Factors,
2024
Zhejiang Transportation Group Expressway Quzhou Management Center , Quzhou，Zhejiang 324000 , China
Intelligent Compaction Of Asphalt Pavement And Its Key Influencing Factors, Zhu Huifang, Wang Liang
Journal of China & Foreign Highway
Intelligent compaction，as a new type of road construction quality monitoring and management technology，has been widely used in the compaction process of asphalt pavement.However，due to the lack of understanding of the compaction process and the interaction mechanism between asphalt mixture particles，the problems of over-compaction and non-uniformity of compaction often occur in the actual construction，which seriously affects the quality of road construction and service performance.In this study，through the combination of the engineering field and indoor tests，the variation characteristics of asphalt mixture compaction with the number of compaction were analyzed by using the semi-variance function of the geostatistical model，and the effect of temperature …
Influence Of Lateral Constraint Conditions And Compactness On Compression Characteristics Of Compacted Loess In Northern Shaanxi,
2024
Yulin Highway Bureau , Yulin，Shaanxi 719199 , China
Influence Of Lateral Constraint Conditions And Compactness On Compression Characteristics Of Compacted Loess In Northern Shaanxi, Chang Yinghong, Zhao Jinpeng, Zhang Xiaozhou, Yang Hao, Li Zhe, Shao Dengfeng, Liu Lulu
Journal of China & Foreign Highway
In recent years，with the rapid development of road engineering construction，subgrade settlement caused by vertical compression of compacted loess has become increasingly serious.The previous research on the deformation of compacted loess mostly focuses on moisture content，porosity，saturation，and other aspects，ignoring the influence of lateral constraint conditions and different compaction on compacted loess.To address these issues，based on the reconstruction and expansion project of G 307 road in northern Shaanxi，this paper selected compacted soil samples of subgrade on site to carry out indoor compression tests.By applying different lateral constraint conditions，the stress-strain curves of compacted loess subjected to vertical multistage load under different compactness and confining …
Performance Of Composite Modified Permeable Concrete With Nano‑Silicon And Polypropylene Fiber,
2024
Shandong Road & Bridge Construction Group Co ., Ltd., Jinan , Shandong 250000 , China
Performance Of Composite Modified Permeable Concrete With Nano‑Silicon And Polypropylene Fiber, Liu Benli, Zhang Peng, Shan Jingsong, Zhao Haijian, Su Benjun, Li Chao
Journal of China & Foreign Highway
In order to improve the comprehensive performance of permeable concrete，nano-silicon and polypropylene fiber were added to permeable concrete to study the performance of the composite modified permeable concrete.Firstly，the influence of single-doped nano-silicon on the performance of cement paste and permeable concrete was studied，and the content of nano-silicon and the optimal water-to-binder ratio were determined.On this basis，different proportions of polypropylene fiber were mixed，and the reasonable content of polypropylene fiber was determined.The results show that nano-silicon improves the porosity of permeable concrete and increases the optimal water-to-binder ratio.When the content of nano-silicon is 0.5%，and the water-to-binder ratio is 0.32，the compressive strength of …
Oxygen Diffusion Behavior In Asphalt Film Based On Molecular Dynamics Simulation,
2024
Zhangjiagang Municipal Transportation Bureau , Zhangjiagang ，Jiangsu 215638，China
Oxygen Diffusion Behavior In Asphalt Film Based On Molecular Dynamics Simulation, Zhang Yu, Li Zheng, Fang Long, Han Bo, Wang Weicheng, Mao Zigen, Liu Qi, Yu Bin
Journal of China & Foreign Highway
Asphalt aging is one of the most important concerns during the use of asphalt pavement.However，asphalt usually exists in the form of a film in the mixture.Oxygen diffusion is an important factor affecting asphalt aging.To investigate the oxygen diffusion behavior in asphalt film under different working conditions，an oxygen-asphalt-aggregate （OAA） model was developed in this study to simulate the state of the asphalt film on the aggregate surface under real conditions.Oxygen diffusion and asphalt component migration in the OAA model were investigated under different conditions of time，temperature，oxygen concentration，and aggregate type.The influence of each factor on the molecular behavior of the model was …
