Lim, S-M, Indraratna, B, Heitor, A orcid.org/0000-0002-2346-8250 et al. (4 more authors) (2022) Influence of matric suction on resilient modulus and CBR of compacted Ballina clay. Construction and Building Materials, 359. 129482. ISSN 0950-0618
Abstract
Road infrastructure is often built above the groundwater table. The materials used are usually compacted and thus generally remain under unsaturated conditions throughout their service life. This paper presents experimental results that highlight the influence of matric suction on the resilient modulus (MR) and California bearing ratio (CBR) of a compacted subgrade Ballina clay (typically found in NSW, Australia). The soil specimens were prepared in a range of water contents and dry unit weights, tested using a series of repeated load triaxial tests and CBR tests, and the associated matric suction was measured using the filter paper method. The tests were complemented by the study of the macrostructure of the compacted specimens using X-ray computed tomography (CT). Test results show that there are intimate relationships between the soil suctions and resilient modulus as well as CBR on the compacted clay at different moisture contents and that both parameters can be defined empirically through matric suction. A linear trend was established between matric suction and MR with a high coefficient of correlation of 0.99. CT scan results reveal that increasing soil moisture increased the inter-pores volume and the aggregations became more compressible and present probable matrix-dominated macrostructure during compaction. While soils compacted at the dry side of optimum moisture content yield distinct aggregations owing to the flocculation and aggregation of soil structure.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 Elsevier Ltd. All rights reserved. This is an author produced version of an article published in Construction and Building Materials]. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Compaction; Matric suction; CT-Scan; CBR; Resilient modulus |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 09 Nov 2022 12:37 |
Last Modified: | 26 Oct 2023 00:13 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.conbuildmat.2022.129482 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:192884 |