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A platform for research: civil engineering, architecture and urbanism
Large-Scale Test to Determine the Crack Retarding Ability of Asphalt Reinforcements
One of the main tasks of asphalt reinforcement is to delay or prevent the formation of reflection cracking in asphalt structures. For large-scale tests on reinforced asphalt systems, the unbound base layers were simulated by an 8 mm thick rubber granulate mat and a 10 mm thick rubber mat resting on a low-vibration concrete plate. The asphalt structure was constructed by an asphalt binder layer with a thickness of 5 cm, covered by an asphalt wearing course with a thickness of 4 cm. With the test field dimensions of 2 × 3 m, sufficient horizontal bonding of the asphalt reinforcement is ensured. To test the crack-bridging effect, the binder layer was notched before applying the bitumen emulsion and paving the asphalt surface layer. Strain gauges were installed and protected against thermal and mechanical stresses to measure the strain under and on top of the reinforcement. The test structure surface were cooled to approx. 10 °C before starting fatigue tests. After some pre-tests the load levels are increased in 7 steps from 8 kN to 48 kN with 18,000 load cycles per load level and a frequency of 10 Hz. With this test configuration, a crack opening could be achieved without excessive vertical deformation. Unfortunately, an evaluation of these strains was only possible for 5 of 8 tests due to damage to the installed strain gauges. Anyway, the results of these tests show that all tested asphalt inlay products delay crack opening and strains measured above the inlay system are significantly lower than the strains directly below.
Large-Scale Test to Determine the Crack Retarding Ability of Asphalt Reinforcements
One of the main tasks of asphalt reinforcement is to delay or prevent the formation of reflection cracking in asphalt structures. For large-scale tests on reinforced asphalt systems, the unbound base layers were simulated by an 8 mm thick rubber granulate mat and a 10 mm thick rubber mat resting on a low-vibration concrete plate. The asphalt structure was constructed by an asphalt binder layer with a thickness of 5 cm, covered by an asphalt wearing course with a thickness of 4 cm. With the test field dimensions of 2 × 3 m, sufficient horizontal bonding of the asphalt reinforcement is ensured. To test the crack-bridging effect, the binder layer was notched before applying the bitumen emulsion and paving the asphalt surface layer. Strain gauges were installed and protected against thermal and mechanical stresses to measure the strain under and on top of the reinforcement. The test structure surface were cooled to approx. 10 °C before starting fatigue tests. After some pre-tests the load levels are increased in 7 steps from 8 kN to 48 kN with 18,000 load cycles per load level and a frequency of 10 Hz. With this test configuration, a crack opening could be achieved without excessive vertical deformation. Unfortunately, an evaluation of these strains was only possible for 5 of 8 tests due to damage to the installed strain gauges. Anyway, the results of these tests show that all tested asphalt inlay products delay crack opening and strains measured above the inlay system are significantly lower than the strains directly below.
Large-Scale Test to Determine the Crack Retarding Ability of Asphalt Reinforcements
Lecture Notes in Civil Engineering
Chabot, Armelle (editor) / Hornych, Pierre (editor) / Harvey, John (editor) / Loria-Salazar, Luis Guillermo (editor) / Wetekam, Jens (author) / Mollenhauer, Konrad (author) / Wistuba, Michael (author) / Büchler, Stephan (author) / Schmalz, Michael (author) / Ziegler, Thomas (author)
Accelerated Pavement Testing to Transport Infrastructure Innovation ; Chapter: 37 ; 357-366
2020-08-26
10 pages
Article/Chapter (Book)
Electronic Resource
English
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