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Geomechanics and Engineering Volume 41, Number 2, April25 2025 (Special Issue) pages 221-232 DOI: https://doi.org/10.12989/gae.2025.41.2.221 |
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 open accessInvestigating rutting performance of unpaved roads with recycled concrete aggregates using small-scale cyclic loading tests |
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Jiacheng Qiu, Yuekai Xie, Yue Chen, Ben Reissenweber,
Chen Wang, Ziheng Wang and Jianfeng Xue
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| Abstract | ||
| The recycling and reuse of construction and demolition materials offer significant environmental and economic benefits. This study investigated the performance of aggregates with varying proportions of recycled concrete aggregate (RCA) and natural aggregate (NA) as base materials. Key parameters, such as compaction behaviour, California bearing ratio (CBR), and resilient modulus, were evaluated. The findings revealed that the mixture with 50% RCA and 50% NA exhibited the highest CBR and resilient modulus values. Small-scale cyclic loading tests were then conducted on the samples of NA, RCA, and a 50% RCA-50% NA mixture to assess the suitability of RCA as a base material. Additionally, RCA and NA samples were reinforced with biaxial geogrids for material optimisation. The results showed that the 50% RCA-50% NA mixture exhibited the smallest permanent deformation, and the geogrid, placed at the middle depth of the base, significantly reduced rut depth. Findings of this experimental study suggest that RCA can be used as an alternative base material to partially replace NA in road construction. The results can help conserve natural resources, promote sustainability through the reuse of waste materials, and reduce the environmental impact associated with the use of NA in road construction. | ||
| Key Words | ||
| geosynthetics; granular materials; ground improvement; reinforced soil; road engineering | ||
| Address | ||
| Jiacheng Qiu, Yuekai Xie, Yue Chen, Ben Reissenweber, Chen Wang, Ziheng Wang and Jianfeng Xue: School of Engineering and Technology, The University of New South Wales, Canberra, Australia | ||