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GPS RTK technology has great potential in acquiring precise data for engineering construction. Based on extensive statistics on road test data from plenty of projects, methods of quality control in road engineering horizontal control survey using GPS RTK Technology are discussed and demonstrated. The plane precision of GPS RTK observed data is explored.
Montmorillonite (MMT) is a typical layered silicate. It has been widely used to modify polymers. In recent years, layered silicate has been receiving more attention from researchers in the civil engineering field, especially the organic nano-montmorillonite (OMMT). Flexible pavement plays an important role in structures of the primary highway at present. With the development of road traffic, asphalt...
With the rapid development and the large investment in highway construction, the detection, evaluation, prediction and maintenance of highway pavement performance are getting more attention than ever before in today's China. While most current codes and standards provide much guidance for the detection and evaluation of highway pavement performance, a systematic management tool to implement these...
In view of the status that there was no expressway pavement preventive maintenance management system at home and abroad at present, based on the technology theory obtained by the author and the demands and process of expressway asphalt pavement preventive maintenance management, preventive maintenance management system for expressway asphalt pavement (EPMMS (V1.0)) was developed. The work or functions...
The telescopic devices of road bridge are the most vulnerable to damage and hardest to repair the site in the bridge structure. Once damages are coming out, it will not only result in driving discomfort,but also damage the main structure of the bridge and affect the normal use of the bridge. Thus,it is causing a certain degree of economic losses and social impacts. This paper describes the various...
Exploiting the potential value of dry crust can produce great technical economic benefitis in important projects, especially in highway engineering, but the characteristic of dry crust's stress dispersion on two-layered subgrade needs further study at present. Based on the experimental road section of Xingtai-Linxi highway in soft soil area, the monitoring data of lamination settlement, which has...
In view of the adverse engineering characteristics of saline soil such as collapsibility, salt expansion and corrosion, cement, cement-lime and KD curing agent have been respectively used to modify the saline soil in the coastal areas for engineering application. Unconfined compressive strength test of the modified soil has been conducted to analyze the reasons why the two previous modified materials...
The resource of natural gravle using in road construction is fruitful in Tibet. If asphalt pavement with graded gravle stone basement is adopted, it can increase performance of road, decrease construction cost because of inconvenient traffic. Through the theoretical analysis, lab test, test road and study of flexible basement for graded gravel stone in special nature conditions in Tibet,this paper...
According to the characteristic of soft soil foundation road, the basic principles of Vacuum-Heaped United Pre-compressed Technology were introduced, an improved construction method of soft soil foundation road was put forward, the functional relationship between the horizontal movement and vertical subsidence of soft soil foundation road boundary was deduced, which can help justify the correctness...
The recent focus on improving the performance of construction cost control for highway project in China has led to a demand from industry for approaches that can cope with increasing complexity. Whilst many existing research now providing the methods to control for deviation from cost standards after finding cost variance, other factors such as component cost risk are still widely ignored. CRCS/CCS,...
The experimental data is provides for designing and construction through a series of indoor test, studing the different influence on compressive strength, elastic modulus, cleavage strength of cold regenerated materials of asphalt pavement caused by the differrent factors such as old aggregate gradation, age and additive and so on. And then, the systematic field test to the test sectionis is carried...
As a black material, asphalt has a strong heat-absorbing capacity which may cause pavement high temperature especially in summer. With the global climatic warming and the widely application of asphalt pavement, the problem of pavement high-temperature will be more serious. In this paper, the effect of the pavement high-temperature on road durability, traffic safety and ecological environment was analyzed,...
Based on analysis of Sanlihua talus slope formation mechanism in Yi-ba expressway, the paper adopts the limit equilibrium method and numerical analysis method to evaluate its stability. The result shows that, it can not achieve the design criterionand must be reinforced. According to its stability conditions and characteristics, anti-slide pile and surface drainage are used to treat the talus slope...
The wear resistance of concrete is helpful to endure the skidding of concrete pavement in an acceptable length of time. In order to produce the concrete with wear resistance in advance, the orthogonal experiment was design take into account water-cement ratio, the cement content, the maximum particle-size of aggregate, sand ratio. The experiment of compressive strength, flexural strength, slump, wear...
The possibilities of reutilizing municipal solid waste incineration (MSWI) bottom ash have been increasingly concerned in China. Major interests in this sense are to use the ash as construction materials in road building elements. Bottom ash from a MSWI plant of China was characterized to investigate the feasibility of recycling its fine and coarse fractions in road construction and assess their environmental...
The requirements for modified bitumen are increasing according to the higher load condition and worse serving environment in modern highway construction. And with the development of nano-technology in material design, it is found that polymer modifier combined with layer silicate can obviously improve the using properties. Nanometer montmorillonite (MMT) modified asphalt concrete is a kind of composite...
This study developed a rut prediction model for bituminous pavement based on long-term rut test. During the development of the rut prediction model, the long-term rut tests curves were obtained by testing asphalt samples with their performance in extension test time. Then, the numerical analysis of the curves had been done by using the Microsoft-Excel. The numerical analysis results indicated that...
The mountain pavement in Southwestern China putts forward strict requirement concerning high temperature stability and water stability of pavement performance. Because it is easy to produce rut, cracks and subsidensce because it's high temperature and rainy. This paper put forward the new SBS asphalt mixture design, basement design and construction method based on optimal mineral aggregate gradation...
A large number of studies have shown that mass concrete structures in the temperature cracks are inevitable. It is important to adopt reasonable measures to combat and control the crack development. Thus, mass concrete temperature cracks must be prevented. Controlling temperature and improving the constraints can start from reducing the thermal stress. It should be possible to try and improve the...
In this paper, the mechanism for different type of temperature cracks in asphalt pavement is analyzed. Further-more, fatigue life of the asphalt pavement containing reflective cracks in the base is predicted by using the Paris law. The relationship between the stress intensity factor and the crack length is established through the finite element model. Then, the fatigue life of the pavement is acquired...
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