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- Kalman, Björn, 1961-, et al.
(författare)
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Estimation of durability of new surface courses using accelerated load test and expert's opinions
- 2022
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Ingår i: Proceedings of the 11th International Conference on the Bearing Capacity of Roads, Railways and Airfields. - London : CRC Press. - 9781003222910 ; , s. 502-510
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Konferensbidrag (refereegranskat)abstract
- There is an increasing interest among road authorities in studying sustain ability assessment of road infrastructure. The durability of the surface course is a critical factor in these calculations and must be carefully considered in the analysis. New types of asphalt mixes with the potential to improve the results in the sustainability assessment have no proven track record and are thus more likely not to be used until solid perform ance data is available. To bridge the gap and diminish the uncertainty about the durability of Green asphalt mixes for surface courses, a combination of laboratory tests and tests in a circular road simulator were performed. Eight mixes were tested in total, four stone mastic asphalt mixes and four porous asphalt mixes. Each group contained a reference mix with well-established performance. The mixes were characterized with dynamic IDT, com plex shear modulus and water sensitivity using MiST (moisture induced stress test). Part of the loose mixes was oven aged at 85 °C simulate long term ageing. Plates of aged and virgin mixes were then tested in a circular road simulator in a program set up to check their sensitivity towards rutting, raveling, freeze-thaw cycles, polishing and fatigue. A combination of expert’s opinion from academia and national road administrations together with the data from the tests were used to estimate the performance of the new Green mixes.
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| 2. |
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| 3. |
- Winter, M., et al.
(författare)
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Validation of national empirical pavement design approaches for cold recycled asphalt bases
- 2021
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Ingår i: Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields. - London : CRC Press. - 9781003222880 ; , s. 87-95
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The applied pavement design procedures differ from country to country within Europe. Especially the use of cold recycling materials which is handled similar to hot-mix asphalt (HMA) in the most available guidelines isn’t sufficient researched. To verify developed procedures, practical trial sections are indispensable. Within this study cold recycled asphalt base layers (CRAB) were assessed according to the German procedure for monitoring and evaluation of road surface conditions. It can be concluded, that the general applied empirical design approach, in which the CRAB layer thickness is increased by 50 % compared to a HMA base will result in a feasible pavement structure. In general, the re-designing of the sections according to various national empirical pavement design approaches partly results in high differences for same layer types.
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