Technical evaluation of using reclaimed asphalt pavement materials as filler in hot mix asphalt
Reclaimed asphalt pavement (RAP) is a valuable material that can be recycled and reused in road engineering to reduce environmental impacts and economic costs. Although numerous studies have investigated RAP content in hot mix asphalt (HMA), the use of RAP as a filler has not been explored. Therefor...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025021206 |
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| Summary: | Reclaimed asphalt pavement (RAP) is a valuable material that can be recycled and reused in road engineering to reduce environmental impacts and economic costs. Although numerous studies have investigated RAP content in hot mix asphalt (HMA), the use of RAP as a filler has not been explored. Therefore, this study presents a new approach by investigating the use of RAP as filler in HMA, which aims to increase the recycling of RAP in HMA and improve mixture performance. The morphological and chemical properties of reclaimed asphalt pavement filler (RAPF) were analyzed using scanning electron microscopy (SEM) and X-ray fluorescence (XRF). To evaluate the optimal method of incorporating RAPF into the HMA, this filler was added to the mixture in two ways: (1) adding bitumen to the mixture of aggregates and RAPF, and (2) adding RAPF to the mixture of bitumen and aggregates. In both methods, RAPF fully replaces the mineral filler with the same proportion used in the control mixture. Mechanical properties of mixtures were evaluated using semi-circular bending, indirect tensile fatigue, Hamburg wheel tracking and modified Lottman tests. Results indicated that RAPF in the first method notably enhanced mixture performance at low and intermediate temperatures, increasing fracture energy by 43 %, peak load and toughness by 12 %, and reducing stiffness by 13 %. Fatigue life increased by 50 %, fatigue crack propagation rate decreased, and tensile strength ratio improved by 2 %, indicating better moisture resistance. However, RAPF showed no significant effect on rutting resistance. These findings suggest RAPF as a promising alternative to mineral fillers. |
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| ISSN: | 2590-1230 |