Investigation of the Reusability of a Polyurethane-Bound Noise-Absorbing Pavement in Terms of Reclaimed Asphalt Pavement
Abstract
:1. Introduction
- They use polyurethane binder (i.e., Elastopave®), of which 83% of the polyol component can be produced from renewable raw materials (e.g., ricinus oil) and thus, they distance themselves from the conventional binder bitumen, which is not a renewable raw material [10].
- They can reduce the heat island effect in cities, because of its density and low heat storage capacity [10].
2. Methodology and Materials
2.1. Methodology
2.2. Material
2.2.1. Preparation of the PU-RAP
2.2.2. Design of the Test Variants
2.2.3. Densities and Void Contents of Tested Specimens
2.3. Selection of Suitable Test Methods
2.3.1. Absorption Behaviour
2.3.2. Deformation Resistance with Uniaxial Cyclic Compression Test (UCCT)
2.3.3. Fatigue Behaviour with Three Point Bending Test (3PB)
2.3.4. Low Temperature Behaviour
Uniaxial Tension Stress Test (UTST)
Thermal Stress Restrained Specimen Test (TSRST)
3. Experimental Results and Discussion
3.1. Densities and Void Contents
3.2. Absorption Potential
3.3. Uniaxial Cyclic Compression Test
3.4. Three Point Bending Test
3.5. Results of Low-Temperature Behaviour
4. Conclusions
- The addition of PU-RAP has a positive influence on the absorption capacity of the polyurethane-bound rubber-modified pavement, as the frequency range can be adjusted.
- The addition of PU-RAP has no significant effect on the deformation behaviour of polyurethane-bound rubber-modified pavement.
- The addition of PU-RAP does not affect the resistance to fatigue of the polyurethane-bound rubber-modified pavement.
- The addition of PU-RAP has no effect on the low-temperature behaviour of the polyurethane-bound rubber-modified pavement.
- The RAP was freshly made, unstressed and unaged when it was reconditioned. The study, in the first step, intended to show the feasibility of reusing the PU-RAP. In the next step, it makes sense to take the RAP material from already stressed pavements and to investigate the functionality.
- All tests should be prepared and tested again with the one-component binder from [3] to generate comparability. The influence of the PU-RAP can likely be worked out even better in this case.
- Additional specimens should be tested to support the conclusions made in this study.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
3PB | three point bending beam test |
PU | polyurethane |
PU-RAP | polyurethane based reclaimed asphalt pavement |
RAP | Reclaimed asphalt pavement |
TSRST | Thermal Stress Restrained Specimen Test |
UTST | Tension Stress Test |
Appendix A
Aggregate Size [mm] | Maximum Density [g/cm] | |
---|---|---|
lime sandstone filler | ≤0.063 | 2.730 |
PU-RAP filler | ≤0.063 | 2.582 |
basalt stone | 0.063–2.0 | 3.050 |
PU-RAP | 0.063–2.0 | 2.588 |
basalt stone | 2.0–5.6 | 3.050 |
PU-RAP | 2.0–5.6 | 2.605 |
rubber super-grob | 2.0–5.6 | 1.100 |
polyurethane | - | 1.100 |
Characteristics | Unit | Measured Value | Method |
---|---|---|---|
Hardness | Shore ID | 72 | DIN 53505 |
Tensile strenth | N/mm² | 32 | DIN EN ISO 527 |
Elongation | % | 40 | DIN EN ISO 527 |
Tear strength | N/mm | 40 | DIN 53515 |
Density | g/cm³ | 1.1 | DIN 53420 |
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Mixture Components | Amount | Unit |
---|---|---|
aggregates | 80.5 | vol.% |
rubber granules | 6.5 | vol.% |
two-component polyurethane | 13 | vol.% |
Variant | RAP0 | RAP25 | RAP50 | RAP75 | |
---|---|---|---|---|---|
PU-RAP | [vol.%] | 0 | 25 | 50 | 75 |
Variant | Specimen No. | [MPa] | [-] | [MPa] |
---|---|---|---|---|
[3] | - | 537 | not reached | 386 |
RAP0 | 5 | 1671 | not reached | 1013 |
7 | 1998 | not reached | 1212 | |
8 | 1903 | not reached | 1101 | |
9 | 2232 | 1262 | 1042 | |
RAP25 | 7 | 467 | 202 | 152 |
8 | 1431 | 62 | 173 | |
9 | 1393 | 50 | 137 | |
10 | 558 | 53 | 133 | |
RAP50 | 5 | 2091 | 82 | 430 |
7 | 1460 | not reached | 831 | |
10 | 1266 | not reached | 779 |
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Faßbender, S.; Oeser, M. Investigation of the Reusability of a Polyurethane-Bound Noise-Absorbing Pavement in Terms of Reclaimed Asphalt Pavement. Materials 2022, 15, 3040. https://doi.org/10.3390/ma15093040
Faßbender S, Oeser M. Investigation of the Reusability of a Polyurethane-Bound Noise-Absorbing Pavement in Terms of Reclaimed Asphalt Pavement. Materials. 2022; 15(9):3040. https://doi.org/10.3390/ma15093040
Chicago/Turabian StyleFaßbender, Sabine, and Markus Oeser. 2022. "Investigation of the Reusability of a Polyurethane-Bound Noise-Absorbing Pavement in Terms of Reclaimed Asphalt Pavement" Materials 15, no. 9: 3040. https://doi.org/10.3390/ma15093040