Road construction plays a vital role in the social and economic development of developing countries.However,it is often constrained by financial limitations,maintenance challenges,and environmental concerns.Building I...Road construction plays a vital role in the social and economic development of developing countries.However,it is often constrained by financial limitations,maintenance challenges,and environmental concerns.Building Information Modelling(BIM)presents a transformative opportunity to improve road construction efficiency,cost-effectiveness,and sustainability by enabling digital collaboration,lifecycle management,and data-driven decision making.This paper examines the current state of BIM application in the road construction sector of developing countries,focusing on lifecycle integration,economic and operational benefits,and key barriers to adoption.Findings indicate that BIM can enhance project outcomes in whole project life.However,challenges such as high initial costs,lack of skilled personnel,and insufficient policy support hinder widespread adoption.Moreover,the underutilization of BIM in the operational phase leads to unsatisfied returns on investment.The study highlights the critical role of government policies in driving BIM implementation,particularly in public-sector road projects.Recommendations include fostering BIM standards,investing in workforce training,and developing localized BIM solutions to maximize long-term benefits for developing nations.展开更多
Road construction plays a vital role in the social and economic development of developing countries.However,it is often constrained by financial limitations,maintenance challenges,and environmental concerns.Building I...Road construction plays a vital role in the social and economic development of developing countries.However,it is often constrained by financial limitations,maintenance challenges,and environmental concerns.Building Information Modelling(BIM)presents a transformative opportunity to improve road construction efficiency,cost-effectiveness,and sustainability by enabling digital collaboration,lifecycle management,and data-driven decision-making.This paper examines the current state of BIM application in the road construction sector of developing countries,focusing on lifecycle integration,economic and operational benefits,and key barriers to adoption.Findings indicate that BIM can enhance project outcomes in whole project life.However,challenges such as high initial costs,lack of skilled personnel,and insufficient policy support hinder widespread adoption.Moreover,the underutilization of BIM in the operational phase leads to unsatisfied returns on investment.The study highlights the critical role of government policies in driving BIM implementation,particularly in public-sector road projects.Recommendations include fostering BIM standards,investing in workforce training,and developing localized BIM solutions to maximize long-term benefits for developing nations.展开更多
The landscape fragmentation caused by road construction has many direct and indirect impacts on wildlife and ecosystems. By using the GIS and statistic software of fragmentation computation, a comprehensive index, roa...The landscape fragmentation caused by road construction has many direct and indirect impacts on wildlife and ecosystems. By using the GIS and statistic software of fragmentation computation, a comprehensive index, road-induced landscape fragmentation index (RLFI), is proposed to quantify the degree of landscape fragmentation resulting from different levels of road constructions. The results show that road-induced fragmentation index in China ranges from 0.987 to 3.357, with a mean of 1.846 in 2002. The regional differences of landscape fragmentation are obvious and scoring sequence is: North China (2.65) > East China (2.62) > Central China (2.60) > South China (2.51) > Southwest China (2.34) > Northeast China (2.19) > Inner Mongolia (1.88) > Northwest China (1.67) > Qinghai-Tibet Plateau (1.65). The anisotropic analysis indicates that the variation of fragmentation index in east-west direction is larger than that in south-north direction.展开更多
Road construction is one example of heavy constructions that may have a substantial temporary impact on local air quality. Construction of Lule? Road during the summer of 2013 generated a great deal of dust emission. ...Road construction is one example of heavy constructions that may have a substantial temporary impact on local air quality. Construction of Lule? Road during the summer of 2013 generated a great deal of dust emission. US EPA recommended exposure-profiling method was used to measure dust emission. Inexpensive BSNE dust samplers were used instead of high volume samplers. The objective was to give a general idea of the amount of dust generated due to the construction work. Dust generation related to weather was discussed under conditions. Estimated threshold wind velocities for road surface materials at the height of 2 m were 12.88 m/s, 12.88 m/s and 24.76 m/s which were lower measured wind velocities, indicating no dust generated from wind erosion. Dust masses for 7 sampling periods show dust generation had a close relation with moisture content of surface material. Wind speed, humidity had minor or no effect. The estimated dust emission rate in the construction work during the measuring period was 22.86 kg TSP/d, 6 kg/d was from construction work and 16.86 kg/d was generated due to traffic on temporary roads.展开更多
We investigated the distribution and frequency of damage to tree stands adjacent to low-volume roads according to the type of hillside materials involved（soil or rock） and hillside gradient in mountainous forests of...We investigated the distribution and frequency of damage to tree stands adjacent to low-volume roads according to the type of hillside materials involved（soil or rock） and hillside gradient in mountainous forests of northern Iran. A total of 80 plots were systematically and randomly sampled to record damaged trees（bending,crushing and wounding） by class of hillside gradient and materials at the edge of road. Tree wounding and crushing at rock slopes was significantly greater than at hillsides with a mix of clay soil（p ／ 0.05）. Damage on hillsides with slope gradients[45% were 2, 8.5 and 2.3 times more frequent than on hillsides with slope gradient／15% for bending, crushing and wounding, respectively. The damage distribution varied according by type and the most frequent damage was tree wounding（p ／ 0.05）. The damage distribution was measured at distances of 4, 5 and 8 m from the road fillslope for tree bending, crushing and wounding, respectively. Using hydraulic excavators and physical barriers（wooden obstruction and synthetic holder） during earthworks for road construction could reduce these damage.展开更多
This research presented a bi-level programming approach to optimize the schedule of ur- ban road construction activities based on a hypothetical transport network, with an objective of mini- mizing the overall traffic...This research presented a bi-level programming approach to optimize the schedule of ur- ban road construction activities based on a hypothetical transport network, with an objective of mini- mizing the overall traffic delays. A heuristic algorithm was utilized to identify a set of road construction schedules, while PARAMICS was adopted to estimate the total travel time in the network under each road construction scenario. To test the performance of proposed heuristics-simulation methodology, a numerical test was implemented. The overall results suggested that the proposed methodol- ogy could quickly find the optimum solution with good convergence.展开更多
The objective of this work is to obtain a composite of clay-cement-metakaolin having good mechanical properties and geotechnical. To do this, a lateritic clay from Burkina Faso referenced ALK was characterized by vari...The objective of this work is to obtain a composite of clay-cement-metakaolin having good mechanical properties and geotechnical. To do this, a lateritic clay from Burkina Faso referenced ALK was characterized by various methods (X-ray diffraction, infrared spectrometry, thermal analysis and Inductively Coupled Plasma, Atomic Emission Spectrometry) in order to be used as a base course after adding cement and metakaolin. The results of the mineralogical characterization of this clay showed that it is composed of kaolinite (65.7 wt.%), quartz (19.3 wt.%) and goethite (10.8 wt.%). The geotechnical tests carried out showed that ALK is moderately plastic with a plasticity index Ip = 22%. The optimum moisture content and the maximum dry density are respectively 15.9% and 1.76 g∙cm<sup>-3</sup>. Simple compressive strength and splitting tensile strength are Rc = 1.59 MPa and ft = 0.149 MPa respectively. The California Bearing Ratio (CBR) index at 95% is 40% and above the minimum value of 30% shows that ALK can be used as a sub-base course in road construction. The addition of cement and metakaolin in various proportions improved the CBR index and the mechanical strength of the composites produced. This improvement is due to the formation of hydrated calcium silicate (CSH) resulting from the pozzolanic reaction between the portlandite of the cement and the amorphous silica of the metakaolin. Thus the 2 wt.% metakaolin and 6 wt.% cement formulation with a 95%CBR index of 81% is suitable for the development of a base course in road construction.展开更多
Construction projects,including road construction,are very important.Therefore,a lot of money is spent on these projects every year.So,the lack of proper planning will increase the cost and cause irreparable damage to...Construction projects,including road construction,are very important.Therefore,a lot of money is spent on these projects every year.So,the lack of proper planning will increase the cost and cause irreparable damage to the country.The role of workshop management is one of the most important factors in increasing the cost of these types of projects.Generally,workshop management plays a very important role in improving the quality and quantity of projects and has an important place in the project implementation process.Therefore,this study evaluated the impact of workshop management on the progress of road construction projects on a case-by-case basis in road construction projects in Tehran province.According to the purpose of the research,this study was a descriptive-survey type.In addition,the tool used in this research was a questionnaire.The statistical population of this research included all experts and specialists in road construction projects,among whom 65 people were selected by snowball method.Then the collected data were analyzed using SPSS software.The results of this study showed that the management of the workshop and its role in the control and implementation of projects is a complex process,which can be implemented at high levels and effectively by combining scientific and experimental training.And a very important point in the discussion of workshop management is applying scientific management to the use of valuable experiences from others.Because management knowledge not only does not negate the use of these experiences,but also emphasizes the necessity of using them.In other words,improving the knowledge of workshop management is one of the requirements for the implementation of value engineering in construction projects,especially road construction,and it is very important.展开更多
With the acceleration of urbanization, the soft foundation treatment technology of urban roads has also been developed by leaps and bounds. However, in the construction of municipal projects, the construction scheme s...With the acceleration of urbanization, the soft foundation treatment technology of urban roads has also been developed by leaps and bounds. However, in the construction of municipal projects, the construction scheme should be selected according to the actual situation to ensure the project quality and maximize the social benefits of municipal roads. We should make bold innovations in combination with reality, constantly improve and optimize the treatment methods of soft soil subgrade, continuously improve the scientific analysis ability of soft soil subgrade, enhance the safety and durability of urban roads, and meet the requirements of urban road construction.展开更多
In order to promote the development of road traffic in our country,it is necessary to strengthen the research on municipal road construction technology,constantly innovate construction technology and construction tech...In order to promote the development of road traffic in our country,it is necessary to strengthen the research on municipal road construction technology,constantly innovate construction technology and construction technique,and then effectively ensure the rapid development of urban traffic.This paper mainly elaborates on asphalt road surface regeneration technology,modified asphalt concrete,concrete road surface anti-cracking technology,three-dimensional printing technology,composite material road surface,polymer composite materials,etc.,to ensure the development of urban transportation and the quality of municipal road projects.展开更多
Drivers experience variations in travel time due to congestion and delays associated with road construction projects on existing transportation facilities. The effect on the travel time of a link decreases as its dist...Drivers experience variations in travel time due to congestion and delays associated with road construction projects on existing transportation facilities. The effect on the travel time of a link decreases as its distance from the road construction project increases. In addition, the effect could extend to the connecting arterial street links within the vicinity of the road construction project. Therefore, the focus of this research is to model the effect of a road construction project on the freeway and connecting arterial street link-level travel times. Data pertaining to a resurfacing construction project, which lasted for six months,was gathered from the traffic incident management systems(TIMS). The travel time data was collected and processed, for each selected freeway and connecting arterial street link,for six months before the start of the resurfacing construction project and six months during the construction of the resurfacing project. Generalized linear models(GLM) were developed and validated for before and during the construction project periods with the average travel time on a link as the dependent variable. Data such as time-of-the-day, dayof-the-week, the distance of a link from the work zone, subject link characteristics, and upstream and downstream link characteristics were collected and used as the predictor variables. The results indicate that the subject link, upstream link and downstream link characteristics have a significant effect on the freeway and connecting arterial street linklevel travel times due to the resurfacing construction project.展开更多
The contents of mechanical equipment management and maintenance mainly include analyzing the causes of equipment faults and replacing the fault parts and strengthening the inspection work. The significance of road and...The contents of mechanical equipment management and maintenance mainly include analyzing the causes of equipment faults and replacing the fault parts and strengthening the inspection work. The significance of road and bridge construction machinery and equipment management and maintenance is to ensure the normal operation of the equipment, continuously introduce new technologies, improve the service performance of the equipment, ensure the stable production of the equipment, help enterprises save costs and ensure the safe production of enterprises.展开更多
Municipal road and bridge engineering has the characteristics of large scale and complex technology, which requires more advanced construction technology in the construction process. Among them, the prestressed constr...Municipal road and bridge engineering has the characteristics of large scale and complex technology, which requires more advanced construction technology in the construction process. Among them, the prestressed construction technology can greatly improve the engineering quality of road and bridge engineering, and it has the advantages of easy operation and low cost. Therefore, the use frequency of prestressed construction technology in road and bridge engineering is very high, but also can shorten the project period, improve the seismic capacity and carrying capacity of the bridge structure, actively promote the development of prestressed construction technology, can greatly improve the construction quality of bridge engineering. This paper starts from the prestress technology as the starting point, expounds the relevant concepts and the current situation, and then explains the specific application of the technology in the road and bridge construction, and finally summarizes the technical points that need to be paid attention to in the construction process. The aim is to deeply understand the prestressed construction technology of road and bridge construction, and to contribute to the construction of road and bridge construction in China.展开更多
With the rapid development of highway traffic construction in China, the scale of road and bridge engineering construction is expanding. In the process of road and bridge construction, it is necessary to do a good job...With the rapid development of highway traffic construction in China, the scale of road and bridge engineering construction is expanding. In the process of road and bridge construction, it is necessary to do a good job of waterproof subgrade surface, which directly affects the safety of the project and the quality of its use. Therefore, in road and bridge construction, scientific and reasonable construction methods should be selected according to the actual situation of the project, and advanced construction technology should be used to solve and prevent all kinds of problems in the construction process in time, so as to ensure the waterproof problem of subgrade and improve the quality of waterproof subgrade. In this paper, the causes of subgrade damage in waterproof construction of roads and bridges are analyzed, and the concrete construction technology is analyzed. Finally, the construction treatment measures of waterproof subgrade surface are put forward.展开更多
At present, some achievements have been made in the research of subgrade settlement in China, and the main research achievements are the optimization schemes for the problems such as bumping at bridge head during the ...At present, some achievements have been made in the research of subgrade settlement in China, and the main research achievements are the optimization schemes for the problems such as bumping at bridge head during the use of roads and bridges. For the construction of subgrade in transition section, the construction process and materials used can have a certain impact on the quality and safety performance of road and bridge. The harm brought by uneven subgrade is mainly that it is easy to form icing and water accumulation in rainy and snowy weather, which leads to out-of-control of vehicles and affects the driving safety of vehicles. Therefore, in order to improve and optimize the above problems, in the construction process, it is necessary to eliminate the factors that lead to uneven settlement of subgrade in a variety of ways to improve the safety and economic value of roads and bridges.展开更多
Based on the rapid development of society, traffic engineering has become the focus of people's continuous attention, especially the construction quality of municipal roads and bridges is related to the overall qu...Based on the rapid development of society, traffic engineering has become the focus of people's continuous attention, especially the construction quality of municipal roads and bridges is related to the overall quality of infrastructure projects, and it also promotes the steady progress of the national economy. However, there are some quality problems in the process of municipal road and bridge construction. The construction unit must solve the quality problems one by one with a strong sense of responsibility, so that the road and bridge construction quality can be greatly improved and the service life of the road can be scientifically extended. Based on this, this paper makes an in-depth analysis of the common quality problems in municipal road and bridge construction, briefly describes the main factors that affect the construction quality, and puts forward scientific measures to ensure the construction quality in each stage, so as to promote the construction level of municipal roads and bridges in China to a new height.展开更多
The improvement of national comprehensive strength drives the continuous improvement of national quality of life.At the same time, both urban modernization and people's daily life and travel put forward higher req...The improvement of national comprehensive strength drives the continuous improvement of national quality of life.At the same time, both urban modernization and people's daily life and travel put forward higher requirements for road and bridge quality and travel safety.In addition, relevant national administrative departments and local governments have invested more and more human, material and financial resources in road and bridge construction, which has increased certain construction difficulty and work pressure for road and bridge construction units.According to the current domestic municipal construction situation, how to improve the smoothness of asphalt pavement through scientific pavement design and effective construction management has become a technical problem that municipal construction managers need to solve as soon as possible.展开更多
In road and bridge construction, the use of concrete materials has become an important method. Although the construction and application of this concrete material has strong superiority and use value, the problem is m...In road and bridge construction, the use of concrete materials has become an important method. Although the construction and application of this concrete material has strong superiority and use value, the problem is more prominent, especially the occurrence of cracks will seriously affect the safety of roads and bridges, which must arouse people's attention. In view of the most common cracks in road and bridge construction, the main influencing factors and corresponding preventive measures are briefly analyzed and discussed.展开更多
Today, with the acceleration of China's urbanization, the whole transportation industry has a stable space for development. With the increase of the number and scale of road and bridge construction projects, the c...Today, with the acceleration of China's urbanization, the whole transportation industry has a stable space for development. With the increase of the number and scale of road and bridge construction projects, the competition among construction enterprises is becoming more and more fierce. In order to develop in the long term in the increasingly fierce market competition, we must constantly improve the quality of road and bridge construction and find out the causes and related problems, combined with the problems existing in the actual construction process, formulate targeted solutions. On this basis, the paper analyzes the disease problems in road and bridge engineering, and puts forward relevant solutions to promote the development and growth of China's transportation industry.展开更多
This paper first introduces the significance of the application of high performance concrete in road and bridge construction. Then it introduces the advantages of high-performance concrete such as wear resistance and ...This paper first introduces the significance of the application of high performance concrete in road and bridge construction. Then it introduces the advantages of high-performance concrete such as wear resistance and anti-pulling, and puts forward some problems that should be paid attention to in the construction of road and bridge, including preparation before construction, technical process during construction and maintenance after construction. Finally, the paper puts forward relevant suggestions on the application of high performance concrete in road and bridge construction, aiming at contributing to the improvement of road and bridge construction quality.展开更多
文摘Road construction plays a vital role in the social and economic development of developing countries.However,it is often constrained by financial limitations,maintenance challenges,and environmental concerns.Building Information Modelling(BIM)presents a transformative opportunity to improve road construction efficiency,cost-effectiveness,and sustainability by enabling digital collaboration,lifecycle management,and data-driven decision making.This paper examines the current state of BIM application in the road construction sector of developing countries,focusing on lifecycle integration,economic and operational benefits,and key barriers to adoption.Findings indicate that BIM can enhance project outcomes in whole project life.However,challenges such as high initial costs,lack of skilled personnel,and insufficient policy support hinder widespread adoption.Moreover,the underutilization of BIM in the operational phase leads to unsatisfied returns on investment.The study highlights the critical role of government policies in driving BIM implementation,particularly in public-sector road projects.Recommendations include fostering BIM standards,investing in workforce training,and developing localized BIM solutions to maximize long-term benefits for developing nations.
文摘Road construction plays a vital role in the social and economic development of developing countries.However,it is often constrained by financial limitations,maintenance challenges,and environmental concerns.Building Information Modelling(BIM)presents a transformative opportunity to improve road construction efficiency,cost-effectiveness,and sustainability by enabling digital collaboration,lifecycle management,and data-driven decision-making.This paper examines the current state of BIM application in the road construction sector of developing countries,focusing on lifecycle integration,economic and operational benefits,and key barriers to adoption.Findings indicate that BIM can enhance project outcomes in whole project life.However,challenges such as high initial costs,lack of skilled personnel,and insufficient policy support hinder widespread adoption.Moreover,the underutilization of BIM in the operational phase leads to unsatisfied returns on investment.The study highlights the critical role of government policies in driving BIM implementation,particularly in public-sector road projects.Recommendations include fostering BIM standards,investing in workforce training,and developing localized BIM solutions to maximize long-term benefits for developing nations.
基金National Natural Science Foundation of China No.40271106 No.90202012
文摘The landscape fragmentation caused by road construction has many direct and indirect impacts on wildlife and ecosystems. By using the GIS and statistic software of fragmentation computation, a comprehensive index, road-induced landscape fragmentation index (RLFI), is proposed to quantify the degree of landscape fragmentation resulting from different levels of road constructions. The results show that road-induced fragmentation index in China ranges from 0.987 to 3.357, with a mean of 1.846 in 2002. The regional differences of landscape fragmentation are obvious and scoring sequence is: North China (2.65) > East China (2.62) > Central China (2.60) > South China (2.51) > Southwest China (2.34) > Northeast China (2.19) > Inner Mongolia (1.88) > Northwest China (1.67) > Qinghai-Tibet Plateau (1.65). The anisotropic analysis indicates that the variation of fragmentation index in east-west direction is larger than that in south-north direction.
文摘Road construction is one example of heavy constructions that may have a substantial temporary impact on local air quality. Construction of Lule? Road during the summer of 2013 generated a great deal of dust emission. US EPA recommended exposure-profiling method was used to measure dust emission. Inexpensive BSNE dust samplers were used instead of high volume samplers. The objective was to give a general idea of the amount of dust generated due to the construction work. Dust generation related to weather was discussed under conditions. Estimated threshold wind velocities for road surface materials at the height of 2 m were 12.88 m/s, 12.88 m/s and 24.76 m/s which were lower measured wind velocities, indicating no dust generated from wind erosion. Dust masses for 7 sampling periods show dust generation had a close relation with moisture content of surface material. Wind speed, humidity had minor or no effect. The estimated dust emission rate in the construction work during the measuring period was 22.86 kg TSP/d, 6 kg/d was from construction work and 16.86 kg/d was generated due to traffic on temporary roads.
文摘We investigated the distribution and frequency of damage to tree stands adjacent to low-volume roads according to the type of hillside materials involved（soil or rock） and hillside gradient in mountainous forests of northern Iran. A total of 80 plots were systematically and randomly sampled to record damaged trees（bending,crushing and wounding） by class of hillside gradient and materials at the edge of road. Tree wounding and crushing at rock slopes was significantly greater than at hillsides with a mix of clay soil（p ／ 0.05）. Damage on hillsides with slope gradients[45% were 2, 8.5 and 2.3 times more frequent than on hillsides with slope gradient／15% for bending, crushing and wounding, respectively. The damage distribution varied according by type and the most frequent damage was tree wounding（p ／ 0.05）. The damage distribution was measured at distances of 4, 5 and 8 m from the road fillslope for tree bending, crushing and wounding, respectively. Using hydraulic excavators and physical barriers（wooden obstruction and synthetic holder） during earthworks for road construction could reduce these damage.
基金Supported by the National Natural Science Foundation of China(71131001)
文摘This research presented a bi-level programming approach to optimize the schedule of ur- ban road construction activities based on a hypothetical transport network, with an objective of mini- mizing the overall traffic delays. A heuristic algorithm was utilized to identify a set of road construction schedules, while PARAMICS was adopted to estimate the total travel time in the network under each road construction scenario. To test the performance of proposed heuristics-simulation methodology, a numerical test was implemented. The overall results suggested that the proposed methodol- ogy could quickly find the optimum solution with good convergence.
文摘The objective of this work is to obtain a composite of clay-cement-metakaolin having good mechanical properties and geotechnical. To do this, a lateritic clay from Burkina Faso referenced ALK was characterized by various methods (X-ray diffraction, infrared spectrometry, thermal analysis and Inductively Coupled Plasma, Atomic Emission Spectrometry) in order to be used as a base course after adding cement and metakaolin. The results of the mineralogical characterization of this clay showed that it is composed of kaolinite (65.7 wt.%), quartz (19.3 wt.%) and goethite (10.8 wt.%). The geotechnical tests carried out showed that ALK is moderately plastic with a plasticity index Ip = 22%. The optimum moisture content and the maximum dry density are respectively 15.9% and 1.76 g∙cm<sup>-3</sup>. Simple compressive strength and splitting tensile strength are Rc = 1.59 MPa and ft = 0.149 MPa respectively. The California Bearing Ratio (CBR) index at 95% is 40% and above the minimum value of 30% shows that ALK can be used as a sub-base course in road construction. The addition of cement and metakaolin in various proportions improved the CBR index and the mechanical strength of the composites produced. This improvement is due to the formation of hydrated calcium silicate (CSH) resulting from the pozzolanic reaction between the portlandite of the cement and the amorphous silica of the metakaolin. Thus the 2 wt.% metakaolin and 6 wt.% cement formulation with a 95%CBR index of 81% is suitable for the development of a base course in road construction.
文摘Construction projects,including road construction,are very important.Therefore,a lot of money is spent on these projects every year.So,the lack of proper planning will increase the cost and cause irreparable damage to the country.The role of workshop management is one of the most important factors in increasing the cost of these types of projects.Generally,workshop management plays a very important role in improving the quality and quantity of projects and has an important place in the project implementation process.Therefore,this study evaluated the impact of workshop management on the progress of road construction projects on a case-by-case basis in road construction projects in Tehran province.According to the purpose of the research,this study was a descriptive-survey type.In addition,the tool used in this research was a questionnaire.The statistical population of this research included all experts and specialists in road construction projects,among whom 65 people were selected by snowball method.Then the collected data were analyzed using SPSS software.The results of this study showed that the management of the workshop and its role in the control and implementation of projects is a complex process,which can be implemented at high levels and effectively by combining scientific and experimental training.And a very important point in the discussion of workshop management is applying scientific management to the use of valuable experiences from others.Because management knowledge not only does not negate the use of these experiences,but also emphasizes the necessity of using them.In other words,improving the knowledge of workshop management is one of the requirements for the implementation of value engineering in construction projects,especially road construction,and it is very important.
文摘With the acceleration of urbanization, the soft foundation treatment technology of urban roads has also been developed by leaps and bounds. However, in the construction of municipal projects, the construction scheme should be selected according to the actual situation to ensure the project quality and maximize the social benefits of municipal roads. We should make bold innovations in combination with reality, constantly improve and optimize the treatment methods of soft soil subgrade, continuously improve the scientific analysis ability of soft soil subgrade, enhance the safety and durability of urban roads, and meet the requirements of urban road construction.
文摘In order to promote the development of road traffic in our country,it is necessary to strengthen the research on municipal road construction technology,constantly innovate construction technology and construction technique,and then effectively ensure the rapid development of urban traffic.This paper mainly elaborates on asphalt road surface regeneration technology,modified asphalt concrete,concrete road surface anti-cracking technology,three-dimensional printing technology,composite material road surface,polymer composite materials,etc.,to ensure the development of urban transportation and the quality of municipal road projects.
基金funded by the United States Department of Transportation-Office of the Assistant Secretary for Research and Technology (USDOT/OST-R) University Transportation Centers Program (Grant #69A3551747127)。
文摘Drivers experience variations in travel time due to congestion and delays associated with road construction projects on existing transportation facilities. The effect on the travel time of a link decreases as its distance from the road construction project increases. In addition, the effect could extend to the connecting arterial street links within the vicinity of the road construction project. Therefore, the focus of this research is to model the effect of a road construction project on the freeway and connecting arterial street link-level travel times. Data pertaining to a resurfacing construction project, which lasted for six months,was gathered from the traffic incident management systems(TIMS). The travel time data was collected and processed, for each selected freeway and connecting arterial street link,for six months before the start of the resurfacing construction project and six months during the construction of the resurfacing project. Generalized linear models(GLM) were developed and validated for before and during the construction project periods with the average travel time on a link as the dependent variable. Data such as time-of-the-day, dayof-the-week, the distance of a link from the work zone, subject link characteristics, and upstream and downstream link characteristics were collected and used as the predictor variables. The results indicate that the subject link, upstream link and downstream link characteristics have a significant effect on the freeway and connecting arterial street linklevel travel times due to the resurfacing construction project.
文摘The contents of mechanical equipment management and maintenance mainly include analyzing the causes of equipment faults and replacing the fault parts and strengthening the inspection work. The significance of road and bridge construction machinery and equipment management and maintenance is to ensure the normal operation of the equipment, continuously introduce new technologies, improve the service performance of the equipment, ensure the stable production of the equipment, help enterprises save costs and ensure the safe production of enterprises.
文摘Municipal road and bridge engineering has the characteristics of large scale and complex technology, which requires more advanced construction technology in the construction process. Among them, the prestressed construction technology can greatly improve the engineering quality of road and bridge engineering, and it has the advantages of easy operation and low cost. Therefore, the use frequency of prestressed construction technology in road and bridge engineering is very high, but also can shorten the project period, improve the seismic capacity and carrying capacity of the bridge structure, actively promote the development of prestressed construction technology, can greatly improve the construction quality of bridge engineering. This paper starts from the prestress technology as the starting point, expounds the relevant concepts and the current situation, and then explains the specific application of the technology in the road and bridge construction, and finally summarizes the technical points that need to be paid attention to in the construction process. The aim is to deeply understand the prestressed construction technology of road and bridge construction, and to contribute to the construction of road and bridge construction in China.
文摘With the rapid development of highway traffic construction in China, the scale of road and bridge engineering construction is expanding. In the process of road and bridge construction, it is necessary to do a good job of waterproof subgrade surface, which directly affects the safety of the project and the quality of its use. Therefore, in road and bridge construction, scientific and reasonable construction methods should be selected according to the actual situation of the project, and advanced construction technology should be used to solve and prevent all kinds of problems in the construction process in time, so as to ensure the waterproof problem of subgrade and improve the quality of waterproof subgrade. In this paper, the causes of subgrade damage in waterproof construction of roads and bridges are analyzed, and the concrete construction technology is analyzed. Finally, the construction treatment measures of waterproof subgrade surface are put forward.
文摘At present, some achievements have been made in the research of subgrade settlement in China, and the main research achievements are the optimization schemes for the problems such as bumping at bridge head during the use of roads and bridges. For the construction of subgrade in transition section, the construction process and materials used can have a certain impact on the quality and safety performance of road and bridge. The harm brought by uneven subgrade is mainly that it is easy to form icing and water accumulation in rainy and snowy weather, which leads to out-of-control of vehicles and affects the driving safety of vehicles. Therefore, in order to improve and optimize the above problems, in the construction process, it is necessary to eliminate the factors that lead to uneven settlement of subgrade in a variety of ways to improve the safety and economic value of roads and bridges.
文摘Based on the rapid development of society, traffic engineering has become the focus of people's continuous attention, especially the construction quality of municipal roads and bridges is related to the overall quality of infrastructure projects, and it also promotes the steady progress of the national economy. However, there are some quality problems in the process of municipal road and bridge construction. The construction unit must solve the quality problems one by one with a strong sense of responsibility, so that the road and bridge construction quality can be greatly improved and the service life of the road can be scientifically extended. Based on this, this paper makes an in-depth analysis of the common quality problems in municipal road and bridge construction, briefly describes the main factors that affect the construction quality, and puts forward scientific measures to ensure the construction quality in each stage, so as to promote the construction level of municipal roads and bridges in China to a new height.
文摘The improvement of national comprehensive strength drives the continuous improvement of national quality of life.At the same time, both urban modernization and people's daily life and travel put forward higher requirements for road and bridge quality and travel safety.In addition, relevant national administrative departments and local governments have invested more and more human, material and financial resources in road and bridge construction, which has increased certain construction difficulty and work pressure for road and bridge construction units.According to the current domestic municipal construction situation, how to improve the smoothness of asphalt pavement through scientific pavement design and effective construction management has become a technical problem that municipal construction managers need to solve as soon as possible.
文摘In road and bridge construction, the use of concrete materials has become an important method. Although the construction and application of this concrete material has strong superiority and use value, the problem is more prominent, especially the occurrence of cracks will seriously affect the safety of roads and bridges, which must arouse people's attention. In view of the most common cracks in road and bridge construction, the main influencing factors and corresponding preventive measures are briefly analyzed and discussed.
文摘Today, with the acceleration of China's urbanization, the whole transportation industry has a stable space for development. With the increase of the number and scale of road and bridge construction projects, the competition among construction enterprises is becoming more and more fierce. In order to develop in the long term in the increasingly fierce market competition, we must constantly improve the quality of road and bridge construction and find out the causes and related problems, combined with the problems existing in the actual construction process, formulate targeted solutions. On this basis, the paper analyzes the disease problems in road and bridge engineering, and puts forward relevant solutions to promote the development and growth of China's transportation industry.
文摘This paper first introduces the significance of the application of high performance concrete in road and bridge construction. Then it introduces the advantages of high-performance concrete such as wear resistance and anti-pulling, and puts forward some problems that should be paid attention to in the construction of road and bridge, including preparation before construction, technical process during construction and maintenance after construction. Finally, the paper puts forward relevant suggestions on the application of high performance concrete in road and bridge construction, aiming at contributing to the improvement of road and bridge construction quality.
