scholarly journals Construction Treatment Technology for Cracks in Asphalt Pavement of Road and Bridge

2020 ◽  
Vol 198 ◽  
pp. 03013
Author(s):  
Yueshu Li
Keyword(s):  
Service Life ◽  
Influencing Factors ◽  
Road Traffic ◽  
Asphalt Pavement ◽  
Construction Technology ◽  
Treatment Technology ◽  
The Common

In recent years, with the development of road traffic in China, road and bridge projects have gradually increased. While the number of projects has increased sharply, construction technology has been greatly improved. The increase in the use of roads and bridges has led to an increase in the probability of cracks on the roads and bridges. Starting from the common types of cracks, this article explains how to effectively ensure the service life of roads and bridges, improve the performance of roads and bridges, avoid road cracks, deal with the cracks, and emphasize the influencing factors of cracks and the corresponding solutions for the reference of relevant personnel.

A New Regeneration and Restoration Technology of Asphalt Pavement

2010 ◽  
Vol 150-151 ◽  
pp. 262-266
Author(s):  
Zhao Feng Lu ◽  
Min Qin ◽  
Xiao Hong Guo
Keyword(s):  
Service Life ◽  
Preventive Maintenance ◽  
Economic Benefit ◽  
Asphalt Pavement ◽  
Construction Technology ◽  
Pavement Surface ◽  
Regeneration Mechanism ◽  
Restoration Mechanism

In order to defer early damages of asphalt pavement, a new regeneration and restoration technology of asphalt pavement surface is presented in preventive maintenance. The regeneration mechanism and the restoration mechanism were analyzed and the applicable conditions of the technology were proposed. Based on the application of tested road, the relevant construction technology and requirements were put forward. The results show that the new regeneration and restoration technology can better restore the surface performances of original asphalt pavement and prolong the service life of asphalt pavement；in contrast with the traditional preventive maintenance technology, it has a good economic benefit, which is worthy of making more widespread popularization and application in preventive maintenance of asphalt pavement.

Key Technique on the Process Control for Construction of Hohhot Circle Expressway Asphalt Pavements

2012 ◽  
Vol 256-259 ◽  
pp. 1748-1753
Author(s):  
Bin Zhao ◽  
Pei Wen Hao
Keyword(s):  
Inner Mongolia ◽  
Raw Materials ◽  
Asphalt Pavement ◽  
Load Capacity ◽  
Asphalt Mixture ◽  
Natural Increase ◽  
Rigid Base ◽  
Construction Technology ◽  
Pavement Structure ◽  
Major Section

As vehicle flow on arterial highway in Inner Mongolia sharply increased, the originally designed natural increase rate of 8% per year has been exceeded on the vehicle flow in some sections. According to statistics, monthly average vehicle flow on major section of G6 expressway has reached a standard flow of 67478 vehicles per day and night, of which in 70-80% are large ones for coal transportation. Therefore, pavement load and road capacity have exceed the designed expressway load capacity. At present, semi-rigid base asphalt pavement structure is still widely used for high-grade highway pavement in Inner Mongolia. With years of construction for such pavement structure, a great deal of valuable experience has been gained on construction technology. However, there are still a few deficiencies in the quality of raw materials, gradation control of asphalt mixture and adjustment of equipment, etc. Hohhot circle expressway connects with the G6 and G7 expressways, suffering from problems such as large vehicle flow and load overweight. This paper introduced a key technique that should be properly controlled during construction of such pavement structure, emphasized technique control and management of the following aspects, i.e. ballast sizes and gradation control, asphalt concrete mixture, adjustment of pavers, validation of mixing proportion in production and reasonable arrangement of process, and summarized corresponding technical measures taken during construction of asphalt pavement in this project.

Mechanical Response Analysis of the Composite Asphalt Pavement

2014 ◽  
Vol 1023 ◽  
pp. 28-31
Author(s):  
Li Min Li
Keyword(s):  
Service Life ◽  
Mechanical Response ◽  
Asphalt Pavement ◽  
Road Construction ◽  
Pavement Design ◽  
Rigid Base ◽  
Response Analysis ◽  
Early Failure ◽  
Short Service Life ◽  
Design Software

With the constant increasing of traffic flow and axle load, the early failure of semi-rigid base asphalt pavement is increasingly serious in China. The bad durability and short service life of pavement have become main obstacles in road construction development. Based on the experience of successful application, the early failure of semi-rigid base asphalt pavement is solved, and the service life of pavement is increased by using of the composite asphalt pavement. To solve the design problem of the composite asphalt pavement , its mechanical properties influence results of are obtained by the factors, such as shear strain, shear stress, compression strain on top of subgrade, etc, by a lot of calculation using Shell pavement design software. These provide theoretical basis for durable asphalt pavement design based on rut-resistance property.

Pattern of major injuries after motorcycle accidents in Egypt: The Mansoura Emergency Hospital experience

Trauma ◽  
2016 ◽  
Vol 19 (1) ◽  
pp. 39-45 ◽  
Author(s):  
El Yamani Fouda ◽  
Mohamed Youssef ◽  
Sameh H Emile ◽  
Hossam Elfeki ◽  
Waleed Thabet ◽  
...  
Keyword(s):  
Road Traffic ◽  
Head Injuries ◽  
Age Groups ◽  
Road Traffic Injuries ◽  
Emergency Hospital ◽  
Chest Injuries ◽  
The Common ◽  
Orthopedic Injuries ◽  
Motorcycle Accidents ◽  
Motorcycle Crashes

Background and aim Motorcycle accidents are one of the leading causes of road traffic injuries and mortality. The aim of this study was to determine the common patterns of major injuries associated with motorcycle accidents in patients attending Mansoura University Emergency Hospital in Egypt, and to measure the magnitude of the problem in our community. Patients and methods Patients involved in motorcycle crashes who were admitted to the hospital during August 2014 to April 2015 were retrospectively reviewed. All age groups and both genders were included. Results Two hundred patients (181 males) with a mean age of 30.7 ± 10.5 years were included with the majority of patients aged 20–40 years. Head injuries were the most frequent fatal injuries (9/61) patients; orthopedic injuries were the most common injuries, occurring in 78.5% of victims. Multisystem injuries occurred in 28% of patients. None of the motorcyclists involved in accidents wore helmets. Conclusion Motorcycle accidents are a common cause of road traffic injuries and mortalities in Egypt, occurring mainly in males aged 20–40 years. The majority of victims had an isolated trauma to single body system. Orthopedic injuries were the most common and least fatal type of injuries. The highest fatalities were among patients with chest injuries then patients with head injuries. None of the victims wore protective clothing or helmets at the time of accident.

Research of Treatment Technology for Electroplating Wastewater

2014 ◽  
Vol 487 ◽  
pp. 713-716 ◽  
Author(s):  
Yi Dan Zhou ◽  
Miao Sun ◽  
Li Juan Wang ◽  
Guan Nan Xi
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Electrochemical Method ◽  
Chemical Process ◽  
Biological Treatment ◽  
Chemical Method ◽  
Treatment Technology ◽  
Electroplating Wastewater ◽  
The Common ◽  
Physical And Chemical

The sources and composition of electroplating waste water are summarized. The common wastewater treatment technology, such as physical and chemical method, physic-chemical process, biological treatment and electrochemical method, and so on. Then the vision for the development of electroplating wastewater treatment technology is made.

Study on the Design of SMA Mixture on Expressway

2014 ◽  
Vol 496-500 ◽  
pp. 2582-2585
Author(s):  
Jian Ping Xu ◽  
Fu Ming Liu
Keyword(s):  
Service Life ◽  
Laboratory Test ◽  
Material Properties ◽  
Road Traffic ◽  
Jiangxi Province ◽  
Skid Resistance ◽  
Maintenance Costs ◽  
Modified Asphalt ◽  
Superior Surface ◽  
Structure Strength

The rapid growth of road traffic brings some requirements on driving comfort and safety, which include good smoothness, skid resistance and reduced noise of the pavement. SMA has adequate structure strength to reduce rutting and provide superior surface function of skid resistance. Modified asphalt as mixture binder, has considerable durability to ensure the service life with less maintenance costs. Associated with laboratory test and trial section, some suggestion and requirements are brought forward in this paper for the material properties and mixture design of SMA on the FuZhou-JiAn expressway in Jiangxi Province.

scholarly journals Study on Key Points of Steel Structure Construction Technology on High-Rise Building

2015 ◽  
Vol 4 (4) ◽  
pp. 49
Author(s):  
Chao Chen
Keyword(s):  
Steel Structure ◽  
Normal Operation ◽  
Construction Technology ◽  
Quality And Safety ◽  
Construction Quality ◽  
Reference Function ◽  
High Rise ◽  
High Rise Building ◽  
Key Points ◽  
The Common

<p>Study of steel structure construction technology on high-rise building was needed to strengthen, in order to improve the construction quality and safety of our building, ensure the normal operation of production and living of people. Therefore, the article will analyze the common technology in steel structure construction of high-rise building, and expect able to play a certain reference function.</p>

scholarly journals An algorithm for the estimation of road traffic space mean speeds from double loop detector data

2016 ◽  
Author(s):  
Margarita Martínez-Díaz ◽  
Ignacio Pérez Pérez
Keyword(s):  
Traffic Management ◽  
Road Traffic ◽  
Time Interval ◽  
Double Loop ◽  
Negative Effects ◽  
Loop Detectors ◽  
The Common ◽  
Log Normal ◽  
The Individual ◽  
Log Normal Distribution

Most algorithms trying to analyze or forecast road traffic rely on many inputs, but in practice, calculations are usually limited by the available data and measurement equipment. Generally, some of these inputs are substituted by raw or even inappropriate estimations, which in some cases come into conflict with the fundamentals of traffic flow theory. This paper refers to one common example of these bad practices. Many traffic management centres depend on the data provided by double loop detectors, which supply, among others, vehicle speeds. The common data treatment is to compute the arithmetic mean of these speeds over different aggregation periods (i.e. the time mean speeds). Time mean speed is not consistent with Edie’s generalized definitions of traffic variables, and therefore it is not the average speed which relates flow to density. This means that current practice begins with an error that can have negative effects in later studies and applications. The algorithm introduced in this paper enables easily the estimation of space mean speeds from the data provided by the loops. It is based on two key hypotheses: stationarity of traffic and log-normal distribution of the individual speeds in each time interval of aggregation. It could also be used in case of transient traffic as a part of any data fusion methodology.DOI: http://dx.doi.org/10.4995/CIT2016.2016.3208 

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