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.

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.

The Elastic Parameters Analysis of Asphalt Overlay the Crashed Cement Concrete Pavement Based on Reliability Theory

2011 ◽  
Vol 99-100 ◽  
pp. 16-20
Author(s):  
Ying Wang ◽  
Lu Yang
Keyword(s):  
Elastic Modulus ◽  
Reliability Index ◽  
Mechanical Response ◽  
Reliability Theory ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
Elastic Parameters ◽  
The Road ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement

Overlay asphalt on the crashed cement concrete pavement is used widely in old cement concrete pavement reconstruction. at present, Aiming at the differences of mechanical response of this compound pavement structure system, paper introduced the road deflection as the control index and discussed the influence to road reliability index caused by elastic parameters of each layer as well as the sensitivity analysis based on the stochastic finite element method and reliability theory. Results show that the reliability index is greater as the asphalt overlay elastic modulus and crashed layer elastic modulus is increasing and lower as the increase of coefficient of variation, also the elastic modulus of asphalt overlay play a most important role in the diversification of deflection and bottom stress.

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.

scholarly journals Fatigue Analysis for Void Repair of Cement Concrete Pavement with Under Slab by Polymer Grouting

2019 ◽  
Vol 5 (7) ◽  
pp. 1452-1464 ◽  
Author(s):  
Can Cui ◽  
Chengchao Guo ◽  
Fuming Wang
Keyword(s):  
Cyclic Loading ◽  
Fatigue Damage ◽  
Damage Evolution ◽  
Vertical Displacement ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
The Road ◽  
Finite Element Software ◽  
Before And After ◽  
Cement Concrete Pavement

After the appearing of voids beneath cement concrete slabs, the pavement loses a continuous and uniform lower support structure, and the stress state of the road panel is extremely unfavorable. The polymer grouting repair is timesaving, efficient and pollution-free. In order to verify the performance improvement and fatigue damage evolution of cement concrete pavement before and after grouting repair, a material damage constitutive model was established. The UMAT subprogram was introduced into the finite element software ABAQUS to analyze the structure under the action of moving cyclic loading, stress response and fatigue damage evolution process before and after regional grouting repair. The results show that the Mises stress and vertical displacement of the grouting repairing slab are very close to the normal state, which indicates that the grouting repair has a prominent influence on the bottom void of the slab. With the rise of loading time, the fatigue damage of the pavement structure is increasing, but the trend is gradually reduced, and the number of load times and the degree of fatigue damage are nonlinear. From the long-term cyclic loading and comprehensive analysis of the construction period, the polymer grouting repair is better than cementitious grout.

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