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Articles 511 - 540 of 5911

Full-Text Articles in Engineering

Innovative Exploration For Green Construction Of Highway Bridges In Dense Urban Areas, Liu Xuexin, Zeng Lei, Meng Yuanying, Hao Guojun, Chen Yao Jul 2024

Innovative Exploration For Green Construction Of Highway Bridges In Dense Urban Areas, Liu Xuexin, Zeng Lei, Meng Yuanying, Hao Guojun, Chen Yao

Journal of China & Foreign Highway

In order to improve the green construction level of highways in dense urban areas，the project characteristics and engineering requirements of the Nansha-Zhongshan Expressway were analyzed，and the concept of green development was implemented in the whole life cycle of highway design，construction，operation，maintenance，and management.The research and development of ten innovative technologies in four categories were highlighted，including industrial intelligent construction of highway bridges，comprehensive utilization of highway resources，environmental protection of highways in coastal wet areas，and integrated design of transportation and tourism in the Guangdong-Hong Kong-Marco Greater Bay Area.Among them，the prefabricated beam annular production line and non-standard eight-lane were the unprecedented technologies first used in the …

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Comparison Of Chinese ， Ame Rican， And Bangladeshi Criteria For Liquefaction Judgment O F Fine‑Grained Soil, Wu Zi Jul 2024

Comparison Of Chinese ， Ame Rican， And Bangladeshi Criteria For Liquefaction Judgment O F Fine‑Grained Soil, Wu Zi

Journal of China & Foreign Highway

The criteria for liquefaction judgment of fi ne-grained soil in current seismic design codes of China，the United States，and Bangladesh are quite different.In order to propose the judgment criteria for engineering application and Chinese code revision，this paper compared the judgment processes and criteria of the three countries.After analyzing the formation process，based on the application of the criteria for liquefaction judgment of 168 fine-grained soil samples collected in Dhaka，Bangladesh and surrounding cities，the rationality of each judgment process and criteria was evaluated comprehensively.Finally，a set of judgment processes and result criteria for fine-grained soil liquefaction integrating all criteria were put forward.

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Bonding Performance Of Chip Seal Containing Waste Tire Rubber Particles, Chen Jianmin, Liu Donghai, Wang Jinyu, Liu Haozhi Jul 2024

Bonding Performance Of Chip Seal Containing Waste Tire Rubber Particles, Chen Jianmin, Liu Donghai, Wang Jinyu, Liu Haozhi

Journal of China & Foreign Highway

In order to promote the reuse of waste tires and reduce environmental pollution，chips were replaced with the same volume of waste tire rubber particles to prepare a new rubber particle chip seal pavement.In order to ensure the bonding between asphalt and aggregate of the rubber particle chip seal，the surface of rubber particles was processed，and the texture characteristics of chip seal specimens with different aggregate particle sizes and rubber content were evaluated.The five indexes of rubber particle content，aggregate particle size ratio，shedding rate，structural depth，and pendulum friction coefficient were correlated and evaluated by SPSS，and the MMLS 3 test was conducted to simulate the …

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Development Of Cyclic Scb Test For Evaluating Fatigue Cracking Resistance Of Asphalt Mixture At Intermediate Temperature, Ye Ma Jul 2024

Development Of Cyclic Scb Test For Evaluating Fatigue Cracking Resistance Of Asphalt Mixture At Intermediate Temperature, Ye Ma

LSU Doctoral Dissertations

Asphalt pavements are subjected to premature cracking due to traffic loading and environmental effects. The Semi-Circular Bending (SCB) test has been traditionally conducted in a monotonic, displacement-controlled mode at intermediate temperature to assess the fatigue crack resistance of asphalt mixtures. However, fatigue damage is essentially deterioration in material integrity as a result of repeated loading. This study aims to develop a cyclic SCB test to characterize the fatigue cracking properties of asphalt mixture utilizing Paris’ Law model. A secondary goal is to apply the Paris’ Law coefficients measured from the developed cyclic SCB test in predicting the fatigue life of …

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Computational Fluid Dynamics Visualization For Unmanned Aerial Systems In Bridge Inspections, Kristoffer B. Borgen, John Mott Jul 2024

Computational Fluid Dynamics Visualization For Unmanned Aerial Systems In Bridge Inspections, Kristoffer B. Borgen, John Mott

Journal of Aviation Technology and Engineering

Bridge inspections are an expensive and time-consuming process, varying significantly with a bridge’s style, height, width, and length. Inspections create interruptions that interfere with bridge use, as the examination requires partial or total closure, causing traffic delays. Unmanned aerial system (UAS) use has increased significantly over the past decade, including assistance and coordination during bridge inspections. However, the impact on a UAS from high winds and turbulent airflows induced by a bridge’s structure can decrease flight safety during inspections. Visualization of these hazards is difficult for UAS operators; therefore, a process to estimate the velocity and locations of these hazardous …

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Evaluation Of Dotd’S Aggregate Sources Friction Using Laboratory And Accelerated Testing, Sudhir Bharati Jul 2024

Evaluation Of Dotd’S Aggregate Sources Friction Using Laboratory And Accelerated Testing, Sudhir Bharati

LSU Master's Theses

Roadway safety is of utmost importance to the state transportation agencies. One of the major factors of roadway safety that agencies have control over is pavement friction which is affected by aggregate and mixture type. The Louisiana Department of Transportation and Development (DOTD) currently uses Polished Stone Values (PSV) obtained from the British Pendulum Device to rate its aggregates. These ratings determine the applicability of aggregates for various projects. However, the ratings are inconsistent, posing significant safety and financial risks. The first part of the thesis compares the currently adopted British Wheel Polisher-based Standard Practice for the Accelerated Polishing of …

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Developing A Cross-Asset Allocation Mechanism, Jon Wilcoxson, Bryan Gibson, Bethany Paris Jul 2024

Developing A Cross-Asset Allocation Mechanism, Jon Wilcoxson, Bryan Gibson, Bethany Paris

Kentucky Transportation Center Research Report

The Kentucky Transportation Cabinet (KYTC) has developed several tools and methods to compare the value of proposed projects within specific programs and asset classes, including the Enhanced Bridge Prioritization Index, Enhanced Pavement Prioritization Index, and the Strategic Highway Investment Formula for Tomorrow (SHIFT). Although immensely valuable, these methods and tools do not offer a convenient way of comparing the contributions of individual projects to meeting overall KYTC performance goals. As such, the Cabinet needs a robust mechanism for comparing the impact of projects across its capital, safety, and asset management programs. Following a review of cross-asset allocation frameworks described in …

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Exploring Performance-Based Contracts: A Good Option To Address Long-Term Road Maintenance In California?, Maria Calahorra-Jimenez, Richard Poythress Jul 2024

Exploring Performance-Based Contracts: A Good Option To Address Long-Term Road Maintenance In California?, Maria Calahorra-Jimenez, Richard Poythress

Mineta Transportation Institute

Performance-based contracts (PBCs) used in road maintenance provide flexibility for considering new materials, design, and technology to achieve predetermined performance targets. Several states in the U.S. have already used these types of contracts in road maintenance, and their experience can inform the use of PBCs in California. The objectives of this research are twofold. First, identify the benefits and challenges of PBCs compared to traditional contracts. Second, explore the main aspects of PBCs implementation for road maintenance and relate them to California's context. To this end, deductive-inductive content analysis was conducted on 84 peer-reviewed articles published between 1998 and 2023. …

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Adopt: An Environmentally-Friendly System For Alerting Drivers To Occluded Pedestrians Traffic, Abrar Abdulrahman Alali Jul 2024

Adopt: An Environmentally-Friendly System For Alerting Drivers To Occluded Pedestrians Traffic, Abrar Abdulrahman Alali

Computer Science Theses & Dissertations

The emergence of sensing technologies and vehicular communications has brought significant opportunities for enhancing pedestrian safety on city streets. However, existing solutions rely on costly technologies such as computer vision and trajectory prediction to detect crossing pedestrians, while they have limits in detecting pedestrians who are occluded by parked cars. Despite the presence of collaborative perception by surrounding vehicles and infrastructure, there is a notable absence of incorporating existing parked cars themselves due to their insufficiency in detecting pedestrians and communicating with other cars while they are turned off. Furthermore, accommodating pedestrians on streets has been linked to an additional …

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Effect Of Hydrothermal Coupling Aging On Performance Of Rubber Modified Asphalt, Chen Zhenwei, Wu Xuewen, Xiao Xuan, Li Ping, Liu Shende Jun 2024

Effect Of Hydrothermal Coupling Aging On Performance Of Rubber Modified Asphalt, Chen Zhenwei, Wu Xuewen, Xiao Xuan, Li Ping, Liu Shende

Journal of China & Foreign Highway

To study the effect of hydrothermal coupling aging on the performance of rubber modified asphalt,this article simulated thermal aging and hydrothermal coupling aging tests and investigated the effect of different aging environments on the high-temperature and low-temperature performance of asphalt from macroscopic and microscopic levels through conventional index tests,dynamic shear rheology tests,and gel chromatography tests,as well as the effect of different aging environments on the interfacial properties through low-temperature adhesion tests of asphalt and aggregates.The results show that the effects of hydrothermal coupling aging on the ductility and softening point of rubber modified asphalt are more significant than those of …

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Fatigue Performance Of Qingchuan Rock Modified Asphalt Mixture Under Accelerated Loading Test, Li Zhi, Hao Yan, Yuan Xiaoman, Zhuang Chuanyi Jun 2024

Fatigue Performance Of Qingchuan Rock Modified Asphalt Mixture Under Accelerated Loading Test, Li Zhi, Hao Yan, Yuan Xiaoman, Zhuang Chuanyi

Journal of China & Foreign Highway

To evaluate the fatigue performance of Qingchuan rock modified asphalt mixture,a dynamic wheel-load three-point bending loading fatigue test device based on an accelerated loading test system of 1∶3 scale pavement was designed.The three-point bending repeated loading fatigue test of a composite rutting specimen of double-layer asphalt mixture under tire rolling was carried out.Through the MTS bending fatigue test of a small beam specimen of asphalt mixture,the improvement effects of Qingchuan rock modified asphalt and composite modified asphalt on the fatigue performance of the asphalt mixture were evaluated.The results show that Qingchuan rock modified asphalt can improve the ability of asphalt …

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Analytical Method For Deformation And Internal Force Of Suspension Bridge Under Concentrated Live Load, Zhao Haixia, Wang Tao Jun 2024

Analytical Method For Deformation And Internal Force Of Suspension Bridge Under Concentrated Live Load, Zhao Haixia, Wang Tao

Journal of China & Foreign Highway

As a flexible structure,the response of suspension bridges under live load has been the focus of research for a long time.This paper presented an analytical calculation method for structural deformation and internal force of suspension bridges under concentrated live load.Based on the known bridge state parameters and live load parameters,the deformation of the main cable,the deformation of the main beam,the relationship between the main cable and the main beam,and the deformation of the bridge tower were analyzed successively.Then,four kinds of governing equations were established,involving the conserved unstrained length of each main cable,the coordinated force and deformation of each suspender,the closed …

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Influence Of Crosswind On Traffic Operation Safety Of Long‑Span Bridges, Shen Quanjun, Wang Zijian, Xing Xiaoliang, Zhang Yu, Gao Lixiao, Chen Liang Jun 2024

Influence Of Crosswind On Traffic Operation Safety Of Long‑Span Bridges, Shen Quanjun, Wang Zijian, Xing Xiaoliang, Zhang Yu, Gao Lixiao, Chen Liang

Journal of China & Foreign Highway

Crosswind has a great influen ce on the operation safety of vehicles on long-span bridges.To explore the relationship between the characteristic parameters of the crosswind and the traffic operation safety of the long-span bridge,the Yellow River Bridge with frequent crosswinds was taken as the experimental section,and the relationship between traffic accidents and the distribution of crosswinds on the bridge was analyzed.A fitting relationship model of traffic operation coordination of the long-span bridge under the action of the crosswind was established.The study shows that the occurrence of crosswinds in each season is highly discrete.The crosswind is the main cause of vehicle …

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Fatigue Analysis Method Through Load Spectrum Considering Cyclic Characteristics For Highway Bridges, Sun Liangfeng, Zheng Xianglong, Shen Mingjiang Jun 2024

Fatigue Analysis Method Through Load Spectrum Considering Cyclic Characteristics For Highway Bridges, Sun Liangfeng, Zheng Xianglong, Shen Mingjiang

Journal of China & Foreign Highway

No abstract provided.

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Characteristics And Safety Of Weaving Areas Of Trunk Roads Based On Traffic Conflicts, Wang Ziming, Li Shubin, Cui Shuai Jun 2024

Characteristics And Safety Of Weaving Areas Of Trunk Roads Based On Traffic Conflicts, Wang Ziming, Li Shubin, Cui Shuai

Journal of China & Foreign Highway

This paper selected a weaving area on Jingshi Road in Jinan,China as the investigation object to study the characteristics of traffic conflicts and the safety level of each lane in the weaving area between the entrance of an urban trunk road and a signal-controlled intersection.In this research,a signal period was set as the investigation interval,traffic conflicts were identified as the research basis,and the collision time (TTTC) was selected as the index.Severity thresholds of traffic conflicts were established by using the cumulative frequency method,and a model was constructed to represent the relationship among the overall traffic volume,traffic density,and the number of …

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Stress And Deformation Of Retaining Structure In Narrow And Long Foundation Pit Based On Steel Braces, Xu Liwu, Chen Zhuoyi, Qiu Lijie Jun 2024

Stress And Deformation Of Retaining Structure In Narrow And Long Foundation Pit Based On Steel Braces, Xu Liwu, Chen Zhuoyi, Qiu Lijie

Journal of China & Foreign Highway

Based on a large deep foundation pit project,the deformation characteristics of the pit support enclosure system,force characteristics,and changing trend of surrounding ground surface settlement during the excavation process of the narrow and long deep foundation pit with steel braces were studied through automated monitoring and numerical simulation.Midas GTS was used to establish the pit model,and the effects of the horizontal spacing of the steel brace,the distance of the third steel brace from the bottom of the pit,the preloaded axial force of the steel brace,and the change of the pile diameter of the pit enclosure on the deformation and force of …

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Correlation Analysis Of Highway Traffic Accidents Based On Improved Apriori Algorithm, Qiu Wenli, Yang Haifeng, Zhang Shaobo, Qiu Yu, Zhao Jiao Jun 2024

Correlation Analysis Of Highway Traffic Accidents Based On Improved Apriori Algorithm, Qiu Wenli, Yang Haifeng, Zhang Shaobo, Qiu Yu, Zhao Jiao

Journal of China & Foreign Highway

In order to explore the as sociation characteristics between influencing factors of accidents from existing traffic data and provide precise and fine-grained decision support information for highway operation and management departments,a constrained improved Apriori algorithm was established to mine the association rules affecting highway traffic accidents by considering four dimensions:driver,environment,road,and vehicle.On the basis of the traditional Apriori algorithm,the improvement of antecedent and consequent constraints of the rule may increase the accuracy and efficiency of mining association rules.Based on the analysis of 3 178 highway traffic accident data,it is shown that the improved Apriori algorithm reduces the number of invalid association …

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Dynamic Responses Of Super‑Wide Self‑Anchored Suspension Bridge Under Blast Loading, Zhou Guangpan, Lin Zhicheng, Fan Jin, Wang Mingyang Jun 2024

Dynamic Responses Of Super‑Wide Self‑Anchored Suspension Bridge Under Blast Loading, Zhou Guangpan, Lin Zhicheng, Fan Jin, Wang Mingyang

Journal of China & Foreign Highway

To study the dynamic response and damage characteristics of the super-wide concrete self-anchored suspension bridge under the blast loading,a real bridge with these characteristics was selected as the background,and the numerical simulation was used to analyze the dynamic response of the top surface crack shape and the vertical displacement of the bottom plate of the super-wide box girder under the close blast of the bridge deck.Firstly,the refined finite element model of the whole bridge was established by using SolidWorks and HyperMesh.Secondly,the blast loading was applied by Ansys/LS-DYNA and *LOAD_BLAST_ENHANCED (LBE ) method,and the reliability of the calculation method was verified …

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Calculation Analysis Of The S Urrounding Rock Pressure In Shallow Buried Unsymmetrial Tunnel Under Variable Slope, Bai Yan, Qiao Ting Ting, Ning Xiaojun, Liu Guokun Jun 2024

Calculation Analysis Of The S Urrounding Rock Pressure In Shallow Buried Unsymmetrial Tunnel Under Variable Slope, Bai Yan, Qiao Ting Ting, Ning Xiaojun, Liu Guokun

Journal of China & Foreign Highway

To provide a reasonable meth od for calculating the surrounding rock pressure in shallow buried unsymmetrial pressure tunnels under variable slope conditions for tunnel design,to establish a model for calculating the surrounding rock pressure in shallow buried unsymmetrial pressure tunnels under variable slope conditions,and to employ the principle of ultimate equilibrium to derived the formula for calculating the surrounding rock pressure.The intermediate variable β' is introduced as the base for selecting the unsymmetrial pressure tunnels surrounding rock pressure calculation method under variable slope conditions,and the derived formulas in this paper are verified by comparing the calculated values of the normative …

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Experimental Study On Influence Of Adsorbed Bound Water On Strength And Permeability Characteristics Of High Liquid Limit Soil, Fu Ceyuan, Zhou Shijie Jun 2024

Experimental Study On Influence Of Adsorbed Bound Water On Strength And Permeability Characteristics Of High Liquid Limit Soil, Fu Ceyuan, Zhou Shijie

Journal of China & Foreign Highway

In order to reveal the influence of adsorbed bound water on the strength and permeability characteristics of high liquid limit soil,the initial adsorbed bound water content of the high liquid limit soil specimens from Hunan and Hainan was controlled by different concentrations of sodium chloride solution,and thermogravimetric analysis method was used to determine the content.The direct shear test,unconfined compressive strength test,and permeability test were carried out.The results show that the adsorbed bound water content decreases with the increase in salt solution concentration,while the strong bound water content is basically unchanged.The adsorbed bound water has a high viscosity,low activity,and certain solid-like …

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Effect Of Cellulose Fiber On Humidity Control And Properties Of Cement Mortar, Liang Jinguo, Ma Baofu Jun 2024

Effect Of Cellulose Fiber On Humidity Control And Properties Of Cement Mortar, Liang Jinguo, Ma Baofu

Journal of China & Foreign Highway

To explore the effect of flax cell ulose fiber on the humidity and basic properties of cement mortar,this paper adopted flax cellulose fibers with different lengths (0.5 and 5 mm ) and mixing amounts (mass fraction of 0.5%,1%,1.5%,and 2% of cement ).Tests were conducted on rheological properties,mechanical properties,autogenous shrinkage properties,and internal relative humidity development of cement mortar.Setting time,compressive strength,shrinkage rate,and relative humidity were used to evaluate the performance improvement effect of cellulose fiber on cement mortar.The results show that the absorbance rate of flax fiber per unit mass of 0.5 mm is 3.45 times its weight,while the absorbance rate of …

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Micro Mechanical Analysis And Experiment On Fatigue Damage Of Rubber Powder Asphalt Mixture Of Expressway, Li Nanpeng, Wang Guoqing, Wang Zhibin, Zhang Xia3, Si Chundi Jun 2024

Micro Mechanical Analysis And Experiment On Fatigue Damage Of Rubber Powder Asphalt Mixture Of Expressway, Li Nanpeng, Wang Guoqing, Wang Zhibin, Zhang Xia3, Si Chundi

Journal of China & Foreign Highway

To explore the fatigue damage mechanism and micro-mechanical behavior of the pavement of rubber powder asphalt mixture (ARHM- 20) of expressway influenced by heavy vehicles,a three-dimensional microstructural model of the mixture was built based on the discrete element method,and research on the damage mechanism from aggregate motion to macroscopic permanent deformation were conducted.The Burger's constitutive model was used to characterize the viscoelastic properties of asphalt mortar.The macro mechanical parameters of Burger ’s model at different temperatures were obtained through asphalt creep tests,and the micro modeling parameters were obtained based on the macro and micro conversion formulas.The irregular coarse aggregate was …

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Performance Of Chlorine Salt Snow‑Melting Agent Based On Improved, Shrp Ice‑Melting Testlyu Yuejing, Dang Bo, Zhang Zhiwei, Tang Wen, Fan Yu Jun 2024

Performance Of Chlorine Salt Snow‑Melting Agent Based On Improved, Shrp Ice‑Melting Testlyu Yuejing, Dang Bo, Zhang Zhiwei, Tang Wen, Fan Yu

Journal of China & Foreign Highway

Chlorine salt snow-melting agent has been widely used because of its excellent ice-melting and snow-removing performance,low price,and easy access.In order to explore the problems of different temperature applicability,non-uniform standard,and rough spreading methods of chlorine salt snow-melting agents,this paper analyzed the influence of temperature,solid and liquid state,and spreading methods on the ice-melting performance of three commonly used chlorine salt snow-melting agents,namely NaCl,CaCl2,and MgCl2,through an improved SHRP ice-melting test.The test results show that the ice-melting performance of the chlorine salt snow-melting agent has strong temperature sensitivity.MgCl2 and CaCl2 snow-melting agents have an exothermic effect during the melting process.The ice-melting efficiency of the …

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Pollution Characteristics Of Heavy Metals In Solid Waste Subgrade Filling Materials, Du Qianhui, Fu Wei, Zhang Junhui, Tang Qiang, Gu Fan Jun 2024

Pollution Characteristics Of Heavy Metals In Solid Waste Subgrade Filling Materials, Du Qianhui, Fu Wei, Zhang Junhui, Tang Qiang, Gu Fan

Journal of China & Foreign Highway

Using solid waste in the road engineering field for subgrade filling is an important approach for building green and low-carbon emission roads.However,most solid waste contains heavy metal pollutants to varying degrees,and heavy metals will be released under complex environments including rainfall infiltration and groundwater immersion,thereby causing pollution to the surrounding soil and groundwater if not handled properly.This paper reviewed the current status of research on four aspects,including the comprehensive use of solid waste materials in subgrade engineering,the leaching and migration behaviors of heavy metals in solid waste,and the prevention and control treatment of heavy metals in solid waste.It is found …

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Analysis Of Asphalt Pavement Structure Based On Master Curve Parameters Of Dynamic Modulus Of Asphalt Mixture, Liu Zhaohui, Yang Xin, Huang You, Liu Li Jun 2024

Analysis Of Asphalt Pavement Structure Based On Master Curve Parameters Of Dynamic Modulus Of Asphalt Mixture, Liu Zhaohui, Yang Xin, Huang You, Liu Li

Journal of China & Foreign Highway

In order to study the effect of the change in the master curve parameters of the dynamic modulus of asphalt mixture and the interaction on the structural response of asphalt pavement,a three-dimensional model of the asphalt pavement structure was established using the finite element method,and the structural calculations of asphalt pavement with semi-rigid base and flexible base were carried out.The master curve parameters of the dynamic modulus δ,α,β,and γ were taken as the influencing factors,and the maximum tensile strain at the bottom of the asphalt layer and the vertical compressive strain at the top of the subgrade were set as …

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Mechanism Of Water‑Damaged Landslides Of Embankments And Comparison Of Reinforcement Measures, Hu Minghua, Zhang Baiyong, Xu Kui Jun 2024

Mechanism Of Water‑Damaged Landslides Of Embankments And Comparison Of Reinforcement Measures, Hu Minghua, Zhang Baiyong, Xu Kui

Journal of China & Foreign Highway

Water damage to embankments serious ly affects the normal operation of highways,so it is extremely important to ensure the stability of the embankment.In addition,it is necessary to analyze the mechanism and study the safety control measures for water-damaged landslides of the embankment.A highway subgrade embankment was studied,and the causes and formation mechanism of the landslide were qualitatively analyzed based on the on-site deformation monitoring and stability calculation.Then,the stability coefficients of different reinforcement schemes were calculated.An appropriate reinforcement scheme was recommended by considering the project cost,construction technology,and construction period.The results indicate that uneven settlement of the embankment stratum is the fundamental …

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Meso-Mechanical Properties Of Bearing Ratio Of Waste Lime‑Fly Ash Macadam And Soil Mixture Based On Discrete Element, Zhang Xiaofei, Chen Yuru, Zhang Song, Gao Lei, Tian Angran, Tang Qiang Jun 2024

Meso-Mechanical Properties Of Bearing Ratio Of Waste Lime‑Fly Ash Macadam And Soil Mixture Based On Discrete Element, Zhang Xiaofei, Chen Yuru, Zhang Song, Gao Lei, Tian Angran, Tang Qiang

Journal of China & Foreign Highway

In the process of applying construction waste to subgrade,the bearing capacity of the material has an important impact on the service performance of roads.In order to evaluate the meso-mechanical properties of construction waste used as subgrade filler,the bearing ratio test of waste lime-fly ash macadam and soil mixture with different stone contents was carried out by using discrete element software.The strength formation mechanism was revealed by using the discrete element method.The results show that the bearing ratio of the mixture increases with the increase in the stone content and reaches the maximum value when the stone content is 80%.In the …

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Review On Lcca And Lca Methods For Pavement Based On Bim, You Shengjie, Hu Yonggang, Liu Xinsuo, Zheng Xiaoyan Jun 2024

Review On Lcca And Lca Methods For Pavement Based On Bim, You Shengjie, Hu Yonggang, Liu Xinsuo, Zheng Xiaoyan

Journal of China & Foreign Highway

Currently,life cycle cost analysis (LCCA ) and life cycle assessment (LCA ) methods are commonly used to assess the economic and environmental impacts of pavement during the whole life cycle.However,there are drawbacks in the application of LCCA and LCA methods,such as a large amount of data and multiple data categories,which lead to a tedious evaluation process.In view of this,some scholars have tried to combine building information modeling (BIM ) with LCCA and LCA methods to optimize the evaluation process.In the pavement field,the combination of LCCA and LCA with BIM is still in its infancy,lacking a summary of relevant research results.Therefore,this …

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Anti‑Freezing Performance Of Cement-Stabilized Mixture For Recycled Aggregate From Solid Construction Waste, Zheng Jiajia, Zhang Laijun, Wang Xihui, Xie Jianwei, Chen Zhiyong Jun 2024

Anti‑Freezing Performance Of Cement-Stabilized Mixture For Recycled Aggregate From Solid Construction Waste, Zheng Jiajia, Zhang Laijun, Wang Xihui, Xie Jianwei, Chen Zhiyong

Journal of China & Foreign Highway

This paper investigated the effects of particle size and content of recycled aggregate on the anti-freezing performance of cement-stabilized recycled aggregate mixture,so as to provide a reference for the fine utilization of recycled aggregate with different particle sizes.The basic performance indexes of recycled aggregates with different particle sizes were tested,and the optimum moisture content and maximum dry density were determined by compaction test.The specimens were prepared with 4% cement content,and the anti-freezing performance of the mixture was evaluated by testing the unconfined compressive strength loss of the mixture after the freeze-thaw cycle.The results show that the optimum moisture content increases,and …

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Experimental Study On Road Performance Of Resin Elastomer For Seamless Expansion Joints Of Bridges, Zhou Wei, Sheng Liang, Gao Qin, Zhang Hui, Zhao Menglong Jun 2024

Experimental Study On Road Performance Of Resin Elastomer For Seamless Expansion Joints Of Bridges, Zhou Wei, Sheng Liang, Gao Qin, Zhang Hui, Zhao Menglong

Journal of China & Foreign Highway

Seamless expansion joint is a new type of bridge expansion joint.In order to study the road performance of resin elastomer for seamless expansion joints,the feasibility of applying resin elastomer to small and medium displacement expansion joints of bridges was explored.Through the rutting test at 60 ℃, low-temperature beam bending test at −10 ℃,dynamic modulus test,Poisson's ratio test,and overlay test (OT),the high and low temperature stability,deformation performance,and fatigue crack resistance of the resin elastomer were compared.The test results show that the dynamic stability of the resin elastomer at 60 ℃ is more than 31 000 times/mm,and the bending strain at low …

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