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| Main Author: | |
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| Format: | Recurso digital |
| Language: | English |
| Published: |
Zenodo
2014
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| Online Access: | https://doi.org/10.5281/zenodo.15245803 |
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Table of Contents:
- <p>Although the road traffic became a prerequisite for an economic growth of the mod-ern society, the road network construction involving the conventional hot asphalt technologies is associated with some negative environmental and health impacts. Therefore, there is a critical need to enable the asphalt production at lower tempera-tures with higher reuse of reclaimed asphalt, with as little as possible compromise of the performance. Consequentially, this should lead to a long-term transition to cold asphalt technologies to the highest possible extent. The objective of this research was to develop a comprehensive method for characterising the influence of bitumen emulsions on asphalt mixture performance isolated from the aggregate and to con-sider the influence of the reclaimed asphalt binder viscosity on the mechanical prop-erties relevant for the pavement design. To realise these objectives, the mixture con-cepts of bitumen emulsion mortar (BEM) and asphalt mixture for base layer were considered. For the BEM mixtures fine aggregate with the particle size distribution close to the CEN Standard Sand was used. Their composition was optimised in two stages and physical and indirect tensile testing-based mechanical properties were evaluated. The asphalt mixtures for base layer were considered with different con-tents of the reclaimed asphalts with two levels of binder ageing. The evaluation com-prised the indirect tensile testing of the statically compacted specimens and the stiff-ness and fatigue performance of the cores from the roller compactor slabs. Standard pavement solutions were proposed by the standard German pavement design meth-od. The BEM mixture testing showed that the major change in the physical properties occurred within the first 28 days of curing, while the mechanical properties continued to develop even few months after that, which was clearly reflected on the specimen fracture behaviour. The emulsifier content was very influential mean to address both the water evaporation and the fracture behaviour. Considering all the obtained re-sults, the method based on the standard BEM mixtures indicated an excellent poten-tial of becoming a national and European-wide evaluation procedure for the bitumen emulsions. The effect of the curing influenced the mechanical properties of the as-phalt mixtures with reclaimed asphalt, too. The mixtures with the higher content of the reclaimed asphalt had mostly better mechanical performance and, bassed on the proposed pavement solutions it can be concluded that the applicability is possible for a wide range of traffic loads. Together with the better understanding of the emulsifier impact and the potential of rejuvenating the aged binder, this could significantly con-tribute to achieving a superior mechanical performance of cold pavement solutions which are comparable and even compatible to the conventional technologies. </p>