Understanding the performance of expansive subgrade materials treated with non-traditional stabilisers: A review

Amakye, Samuel Y; Abbey, Samuel J

Abstract

13 Expansive soils are problematic soils which pose a risk to the safety of civil engineering 14 structures. These soils can be treated by compaction or by adding additives to the soil. 15 Where the strength and properties of expansive soil cannot be improved via 16 mechanical stabilisation (Compaction), a desirable strength can be achieved through 17 the use of chemical admixture techniques. The swelling and shrinkage of expansive 18 soils cause movement in the soil mass resulting in a deferential settlement in 19 engineering structures such as roads and building leading to cracks and subsequent 20 failure leading to high cost of maintenance. Calcium based additives such as cement 21 and lime have been used in expansive subgrade stabilisation to enhance the strength, 22 reduce swell and subsequent differential settlement. However, the growing concerns 23 on carbon dioxide (CO2) emission and climate change have reignited the need for a 24 more sustainable soil stabilisation techniques using waste materials. In this study, non-25 traditional expansive subgrade treatment techniques using sustainable waste 26 materials with respect to their efficiency in improving the geotechnical engineering 27 properties of the subgrade materials have been investigated and reviewed. This study 28 also discusses the engineering problems associated with expansive soils, proposing 29 an effective, efficient, cheaper and sustainable application of non-traditional stabilisers 30 in expansive soil stabilisation. The study concludes that, the addition of non-traditional 31 stabilisers in expansive subgrade stabilisation using chemical stabilisation techniques 32 can improve the engineering properties of expansive subgrade materials. 33 2

• Journal Article Type: Review
• Acceptance Date: Jun 4, 2021
• Online Publication Date: Jun 10, 2021
• Publication Date: 2021-10
• Deposit Date: Jun 10, 2021
• Publicly Available Date: Jul 14, 2021
• Journal: Cleaner Engineering and Technology
• Electronic ISSN: 2666-7908
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 4
• Article Number: 100159
• Keywords: expansive soil; subgrade stabilisation; engineering properties; California
• Public URL: https://uwe-repository.worktribe.com/output/7457477