Analysis of the Mode of Crushing and Stability in Old Cement Pavement during Asphalt Overlay Project

2012 ◽  
Vol 204-208 ◽  
pp. 1941-1944 ◽  
Author(s):  
Hua Wang ◽  
Yun Feng Wu ◽  
Song Ye
Keyword(s):  
Concrete Slab ◽  
Relative Displacement ◽  
Concrete Pavement ◽  
Construction Technology ◽  
Reflective Cracking ◽  
Cement Concrete ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement ◽  
Pressure Impact

In the process of old cement concrete pavement is transformed, asphalt overlay is the common method. However, due to the cracks of the original cement concrete slab when load and temperature and humidity changes will produce a relative displacement, it can not avoid reflective cracking. So in order to prevent the reflective cracking of asphalt overlay, crush the old cement concrete pavement is the important manner. Different construction technology is divided into three kinds: cracked steady pressure, impact compaction and rubblization technology. Among these, rubblization is an important technology that utilizes in-situ crushing technique in cement concrete pavement. This article discusses the characteristics of these three techniques, and it also evaluates effectiveness.

Study on Design Method for Asphalt Overlay on Old Cement Concrete Pavement in Shanxi Province on Trunk Highway

2014 ◽  
Vol 556-562 ◽  
pp. 977-983 ◽  
Author(s):  
Hui Wang ◽  
Jiu Peng Zhang
Keyword(s):  
Mechanical Response ◽  
Design Method ◽  
Concrete Pavement ◽  
Shanxi Province ◽  
Reflective Cracking ◽  
Cement Concrete ◽  
Heavy Load ◽  
Improvement Project ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement

In view of the the imperfection of design method of asphalt overlay on old cement under heavy-load traffic, and with the background of a successful practice of repaving improvement project in Xia Jiaying-Fen Yang expressway, this article analyzes the mechanical response of the old cement concrete road slab and the overlay, takes the influence of the void under slab on the life expectancy of asphalt overlay into account, and advances the mechanistic-empirical design process of asphalt overlay under heavy-load traffic. In comparison with Chinese standard, this method takes the influence of old concrete pavement on the reflective cracking of overlay into consideration, which ensures that there is no reflective cracking on the overlay in 3 years.

Grouting Material Mix Proportion Test Research of Void the Old Cement Concrete Pavement Slab

2014 ◽  
Vol 912-914 ◽  
pp. 162-167
Author(s):  
Da Wei Lv ◽  
Guan Jun Xu ◽  
Xiao Li Sun
Keyword(s):  
Experimental Studies ◽  
Concrete Pavement ◽  
Service Performance ◽  
Cement Concrete ◽  
Bleeding Rate ◽  
Asphalt Overlay ◽  
Grouting Material ◽  
Mix Proportion ◽  
Cement Concrete Pavement ◽  
Mixing Proportion

The effective treatment of void cement concrete pavement slab through grouting technology is the important premise of ensuring the service performance of asphalt overlay engineer on cement concrete pavement. Based on the current problems of grouting technology, we did experimental studies on the mixing proportion of grout slurry and analyzed the effects of slurry composition and admixture type on mechanical properties including the strength, mobility, viscosity, expansion rate and bleeding rate of the slurry and on the service performance. Based on these, we put forward the control indexes for grouting slurry mix proportion determination which provided guidance for the design and construction quality control of grouting under the old cement concrete pavement slab.

Stress Analysis for Cement Concrete around Joint Dowel after Loosing

2013 ◽  
Vol 857 ◽  
pp. 222-226
Author(s):  
Rong Guo Hou ◽  
Kai Min Niu
Keyword(s):  
Shear Stress ◽  
Stress Concentration ◽  
Load Transfer ◽  
Concrete Slab ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
Transfer Capability ◽  
Cement Concrete Pavement ◽  
Contraction Joint ◽  
Increasing Load

The stress concentration will appear in cement concrete around joint dowel set in contraction joint of cement concrete pavement with repeated loads. And concrete around joint dowel will damage gradually.In this paper, the stress of concrete around joint dowel and deflection of concrete slab are analyzed when joint dowel loosing. It is indicated that the shear stress is key to damage of concrete around joint dowel. when the loosing width reaches certain extent. With loosing width increasing, load transfer capacity will decrease gradually. And it is shown that the load transfer capability will lower rapidly when the loosing width comes in 4cm.

Analysis the Control Techniques of Reflection Crack on Asphalt Overlay of Old Cement Concrete Pavement

2012 ◽  
Vol 204-208 ◽  
pp. 1945-1948 ◽  
Author(s):  
Jue Wang
Keyword(s):  
Main Type ◽  
Concrete Pavement ◽  
Pavement Performance ◽  
Cement Concrete ◽  
Paper Briefly ◽  
Control Techniques ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement ◽  
Reflection Crack ◽  
Technical Measures

Cement concrete pavement is the main type of highway pavement in our country. The asphalt overlay on old concrete pavement is one of the main measures to improve the pavement performance, to improve the bearing capacity and extended service life. But, the prevention of reflection cracks is a key problem need to overcome. This paper briefly analyzes cause of the formed mechanism of reflecting crack of bituminous paving course on old cement concrete pavement, and elaborated some major technical measures of preventing or retarding reflection cracks.

Research of Zero Stress Temperature Gradient in Cement Concrete Pavement

2013 ◽  
Vol 723 ◽  
pp. 163-170 ◽  
Author(s):  
Xiang Shen Hou ◽  
Xin Kai Li ◽  
Bo Peng ◽  
Guang Hui Deng
Keyword(s):  
Temperature Gradient ◽  
Concrete Beam ◽  
Concrete Slab ◽  
Strain Sensor ◽  
Concrete Pavement ◽  
Early Age ◽  
Cement Concrete ◽  
Setting Process ◽  
Cement Concrete Pavement ◽  
Design Guidance

There is no temperature stress and temperature curling according to the present cement concrete pavement design, when the temperature gradient of cement concrete pavement in service is zero, and it does not consider the effect of Built-in curling caused in early-age setting process of cement concrete to cement concrete pavement in service. In fact, there is Built-in curling in cement concrete slab when it is after the completion of the cement concrete slab is poured, and the curling is mainly upward. It is in the setting process, when cement concrete is on the final set, the cement concrete is at the critical moment when is just able to bear load, and it exists temperature gradient but no strain in the pavement slab, the temperature gradient is known as "Built-in construction temperature gradient" in AASHTO2002 design guidance, and it is the important part of the Built-in curling. In this paper, cement concrete beam specimens were poured in outdoor and temperature sensor and strain sensor were buried in the cement concrete specimens to detect early-age internal temperature field and strain field, and then the study of Built-in curling and Built-in construction temperature gradient were carried out.

The Research on the Temperature Resistance Test of Polypropylene Geotextile in Asphalt Overlay

2012 ◽  
Vol 178-181 ◽  
pp. 1287-1292
Author(s):  
Rong Guo Hou ◽  
Bo Tian ◽  
Lei Quan
Keyword(s):  
High Temperature ◽  
Melting Point ◽  
Asphalt Mixture ◽  
Concrete Pavement ◽  
Temperature Fields ◽  
Cement Concrete ◽  
Modeling And Analysis ◽  
Temperature Resistance ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement

The melting point of polypropylene geotextile is 170 centigrade. However, during the repaving design of the old cement concrete pavement, the paving temperature of the asphalt mixture is often 160-170 centigrade or above. Therefore, it is very important to verify that whether the polypropylene geotextile can be paved under a high temperature. Through the modeling and analysis of temperature fields and relevant temperature tests in the laboratory, the paper has tested the surface temperatures of the polypropylene geotexile when the asphalt mixture is paved under a high temperature. The results show that, under a simulated paving temperature of over 190 centigrade, the highest temperature of polypropylene geotextile is only about 160 centigrade, which is lower than its melting point. Therefore, the polypropylene geotextile can be used for the paving under a high temperature.

Numerical Simulation of the Process of Partial Void Formation under Cement Concrete Pavement Slab

2011 ◽  
Vol 97-98 ◽  
pp. 241-246
Author(s):  
Xiao Chun Zhang ◽  
Shu Shu Liu ◽  
Shi Kui Hu ◽  
Ning Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Concrete Slab ◽  
Void Formation ◽  
Concrete Pavement ◽  
Void Size ◽  
Cement Concrete ◽  
Center Edge ◽  
Cement Concrete Pavement ◽  
D Model

The damage of void under cement concrete slab is one of the main diseases in cement concrete pavement. By finite element method, a 3-D model of cement concrete pavement structure was established to simulate the partial void under the cement concrete pavement slab with different loading conditions. The process of the division between the subgrade and the slab with a soft area under the slab are reappeared. The changing rules of the void size with the number of cycle load in case of different tie pressure and loading location (at the center, edge or corner of the slab).

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