Conference paper
Performance Evaluation of Base Course Gravel and Fine Subgrade Combinations for In Situ Cementitious Stabilisation of Pavements
Geo-Congress 2023 Proceedings, 332
Geo-Congress, 2023 (Los Angeles, United States, 26-Mar-2023 - 29-Mar-2023)
American Society for Civil Engineers
2023
Abstract
In situ stabilisation of existing pavement materials is a valuable rehabilitation treatment for secondary and local roads that are generally comprised of a gravel base course with a thin bituminous surface. However, sometimes the required stabilisation depth exceeds the existing base course thickness, meaning some portion of the underlying subgrade is incorporated into the stabilised material. The aim of this research was to determine the effect of subgrade inclusion on the unconfined compression strength (UCS) of the stabilisation material, as an indicator of the performance of stabilised base course and subgrade blends. It was found that three different subgrades, each at 20%–50% of the total granular material, achieved acceptable UCS values with 3%–7% of a triple-blend cementitious binder. Furthermore, it was found that pre-mixing of the hydrated lime component into the granular material was more beneficial when reactive clay subgrades were encountered. In the future, in situ cementitious stabilisation of combined base and subgrade materials (referred to as ‘basegrade stabilisation’) should not be resisted, as long as the associated UCS values are generally in the acceptable range of 1–2 MPa.
Details
- Title
- Performance Evaluation of Base Course Gravel and Fine Subgrade Combinations for In Situ Cementitious Stabilisation of Pavements
- Authors
- Greg White (Author) - University of the Sunshine Coast, Queensland, School of Science, Technology and EngineeringScott Young (Author) - Stabilised Pavements of Australia
- Publication details
- Geo-Congress 2023 Proceedings, 332; 323
- Conference details
- Geo-Congress, 2023 (Los Angeles, United States, 26-Mar-2023 - 29-Mar-2023)
- Publisher
- American Society for Civil Engineers
- DOI
- 10.1061/9780784484708.030
- Organisation Unit
- School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99717595802621
- Output Type
- Conference paper
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