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Appropriate use of lime in the study of the physicochemical behaviour of stabilised lateritic soil under continuous water ingress

Okeke, Chukwueloka; Abbey, Samuel; Oti, Jonathan; Eyo, Eyo; Johnson, Abiola; Ngambi, Samson; Abam, Tamunoene; Ujile, Mgboawaji

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Authors

Chukwueloka Okeke

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Samuel Abbey Samuel.Abbey@uwe.ac.uk
Senior Lecturer in Geotechnical Engineering

Jonathan Oti

Eyo Eyo

Abiola Johnson

Samson Ngambi

Tamunoene Abam

Mgboawaji Ujile



Abstract

Licensee MDPI, Basel, Switzerland. Lime stabilisation is one of the traditional methods of improving the engineering properties of lateritic soils for use as subgrade and foundation materials for the construction of road pavements and highway embankments. Understanding the mechanical performance of lime-stabilised lateritic subgrades in terms of their durability under continuous water ingress will improve environmental sustainability by conserving scarce natural resources and reducing the environmental impacts of repair and replacement of pavements. However, there are several conflicting reports on the durability of lime-stabilised soils subjected to continuous water ingress and harsh environmental conditions. Therefore, this paper evaluates the influence of leaching on the physicochemical behaviour and durability of lime-stabilised lateritic soil under continuous water ingress, simulating the typical experience in a tropical environment. Variations in the strength and durability of the lateritic soil at various lime contents (0, 2.5, 5, 7.5, 10, 15, and 20 wt.%) and soaking periods (3, 7, 14 and 28 days) were evaluated by performing the California bearing ratio tests before and after sub-jecting the lime-lateritic soil (LLS) samples to continuous leaching using two modified leaching cells. Furthermore, physicochemical analysis was performed to assess the variation of cation concentra-tions and changes in the physical properties of the pore fluid as the leaching time progressed from 3 to 28 days. The results show that the minimum strength reduction index of the soil corresponds to its lime stabilisation optimum (LSO). Electrical conductivity decreased monotonically and almost uniformly with an increase in leaching time, irrespective of lime content. So, too, was calcium concentration and to a lesser degree for pH and potassium concentration. Adverse changes in the phys-icochemical behaviour of the LLS samples occurred at lime contents below and slightly above the optimum lime content of the soil. Whereas permanent pozzolanic reactions occurred at lime contents above the LSO and thus resulted in a 45-fold increase in strength and durability. The results are significant for reducing the detrimental effect of the leaching-induced deterioration of flexible pavements founded on tropical floodplains.

Citation

Okeke, C., Abbey, S., Oti, J., Eyo, E., Johnson, A., Ngambi, S., …Ujile, M. (2021). Appropriate use of lime in the study of the physicochemical behaviour of stabilised lateritic soil under continuous water ingress. Sustainability, 13(1), 1-26. https://doi.org/10.3390/su13010257

Journal Article Type Article
Acceptance Date Dec 25, 2020
Online Publication Date Dec 29, 2020
Publication Date 2021
Deposit Date Jan 25, 2021
Publicly Available Date Jan 27, 2021
Journal Sustainability
Print ISSN 2071-1050
Electronic ISSN 2071-1050
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 13
Issue 1
Article Number 257
Pages 1-26
DOI https://doi.org/10.3390/su13010257
Keywords Renewable Energy, Sustainability and the Environment; Geography, Planning and Development; Management, Monitoring, Policy and Law
Public URL https://uwe-repository.worktribe.com/output/7032698

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