Asphalt Overlaying Cement Pavement Structure with APP Modified Asphalt Felt Controlling Reflective Crack

2010 ◽  
Vol 168-170 ◽  
pp. 1218-1221
Author(s):  
Xiao Feng Wang ◽  
Yu Qing Yuan
Keyword(s):  
Tensile Modulus ◽  
Element Model ◽  
Core Sample ◽  
Concrete Pavement ◽  
The Other ◽  
Cement Concrete ◽  
Atactic Polypropylene ◽  
Modified Asphalt ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement

In order to explore the mechanism and effect of atactic polypropylene (APP) modified asphalt felt preventing crack, which is used as interlayer between old cement concrete pavement and asphalt overlay, by dint of establishing finite element model, considering tensile modulus of the material, the authors calculated and analyzed the load, temperature and coupling stresses on the key dangerous points. Then, laboratory test of direct-shearing and pullout were carried out. It is indicated that the interlayer stress conditions change with tensile modulus of felt, with a perfect synthetically stress-reduced effect when the modulus reaching 1000MPa; the shearing- destruction displacement of core sample with felt interlayer comes to 7.5mm, 3.0mm more than that without the specific interlayer; the pullout-destruction force of core sample with felt interlayer arrives at 10000N, 6000N more than the other. The results show that APP modified asphalt felt is a kind of better preventing-crack materials between old cement concrete pavement and asphalt overlay, which can efficiently cut down the interlayer stresses and improve its working state.

Experimental Study on APP Modified Asphalt Felt Used as Interlayer between Old Cement Concrete Pavement and Asphalt Overlay

2012 ◽  
Vol 193-194 ◽  
pp. 544-547
Author(s):  
Yu Qing Yuan ◽  
Xue Chan Li ◽  
Tao Guo ◽  
Wei Li ◽  
Liu Yang Wang
Keyword(s):  
Concrete Pavement ◽  
Test Bed ◽  
Cement Concrete ◽  
Atactic Polypropylene ◽  
Modified Asphalt ◽  
The Road ◽  
Direct Shear Tests ◽  
Asphalt Overlay ◽  
Tension Tests ◽  
Cement Concrete Pavement

To study the mechanisms and effects of atactic polypropylene (APP) modified asphalt felt preventing crack, which is used as interlayer between old cement concrete pavement and asphalt overlay, authors carried through the tests of level tension, field road, and direct shearing. A new test-bed machine, named level tension for interlayer, was developed, and its mechanical composition and work principle were also set forth. Using the new machine, level tension tests were conducted with APP modified asphalt felt as interlayer materials, which indicated that the test-bed has favorable mechanical behaviors and the felt has better performance to prevent cracks than any other materials. APP modified asphalt felt was applied to field road, moreover, its favorable interlayer bonding and working performances were proved by field drill cores. The direct shear tests accounted that the shearing destruction displacement comes to 7.5mm, 3.0mm more than that without the specific interlayer, with the cores from the road. The test results showed that APP modified asphalt felt has good road service performances, with evident effect of anti-cracking when it is used as an interlayer material between asphalt overlay and old cement concrete pavement.

Stress Analysis of Cement Concrete Pavement under Overweight Loads

2012 ◽  
Vol 446-449 ◽  
pp. 949-953
Author(s):  
Ya Ni Lu ◽  
Tao Li Xiao
Keyword(s):  
Finite Element ◽  
Regression Analysis ◽  
Finite Element Model ◽  
Element Model ◽  
Concrete Pavement ◽  
The Other ◽  
Tension Stress ◽  
Statistical Regression ◽  
Cement Concrete ◽  
Cement Concrete Pavement

Special load has produced serious damage to the concrete pavement because of the great gross weight and heavy axle load, but the present specification has not mentioned this kind of load. On this occasion, Several conditions of critical load are identified through ANSYS finite element model analysis and the formula through statistical regression analysis to the bottom maximum tension stress is drawn up. Which can not only guide the concrete pavement design under the special load but also the result may be referred by the other kinds of engineering.

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.

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.

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.

The Thermal Stress Analysis on Stress Absorption Interlayer of Asphalt Overlay

2012 ◽  
Vol 174-177 ◽  
pp. 570-574
Author(s):  
Peng Tao Xue ◽  
Xiu Shan Wang
Keyword(s):  
Shear Stress ◽  
Thermal Stress ◽  
Vertical Displacement ◽  
Concrete Pavement ◽  
Laminar Shear Stress ◽  
Cement Concrete ◽  
Bottom Stress ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement ◽  
Laminar Shear

By using finite element method, the thermal stress of stress absorption interlayer of asphalt overlay on the cement concrete pavement is analyzed in this paper. The result shows that the inter-laminar shear stress and the structural vertical displacement are influenced by the thickness of stress absorption layer, while the asphalt bottom stress is less affected; the increase of the modulus is unfavorable to the structural vertical displacement, the inter-laminar shear stress and the asphalt bottom stress.

Effect of Interface Bond Condition on Airport Double-Layer Pavement Overlay’s Load Stress and Deflection

2013 ◽  
Vol 639-640 ◽  
pp. 429-433 ◽  
Author(s):  
Xing Zhong Weng ◽  
Xiang Cheng Yan ◽  
Wen Lu Liu ◽  
Lei Liang ◽  
Xin Qiang Li
Keyword(s):  
Double Layer ◽  
Coupling Coefficient ◽  
Three Dimensional ◽  
Element Model ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
Cement Concrete Pavement ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Interface Bond

In order to study the influence of interface bond condition between new and old cement concrete pavement on overlay performance, the three-dimensional finite element model of the airport double-layer pavement was established. The pavement overlay's load stress and deflection were analyzed, the coupling coefficient between new and old cement concrete pavement was calculated based on the bottom of overlay deflection basin shape factor. The results show that the coupling coefficient reflects the degrees of interface bond condition well. Poor interface bond condition increases the overlay's load stress and deflection. The points that more closely distance from the wheels load center, the bigger the pavement overlay's load stress and deflection is. Therefore, more attention should be paid to the interface bond condition during the airport pavement overlay's designs and constructions.

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