The effects of lime content and environmental temperature on the mechanical and hydraulic properties of extremely high plastic clays
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Publication date
2018-092018-09
Keyword
Lime treatmentExpansive clay
Mechanical behaviour
Hydraulic behaviour
Swelling pressure
Unconfined compressive strength
Rights
© 2018 Elsevier B.V. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.Peer-Reviewed
Yes
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This paper focuses on monitoring the evolution of lime-clay reactions using geotechnical parameters as a function of lime content and environmental temperature. Lime contents of 5, 7, 9, 11 and 13% by dry weight of expansive clay powder were added to prepare lime-clay specimens. The specimens were prepared at the same dry unit weight of 12.16 kN/m3 and moisture content of 40% except for tests aimed at the determination of dry unit weight as a function of mellowing period. Prepared specimens were mellowed or cured at two different ambient temperatures of 20 °C and 40 °C. Results attained from Unconfined Compressive Strength and permeability tests were employed to assess the impact of lime content on the mechanical and hydraulic properties of lime treated expansive clays. The results revealed that at the beginning, the rate of strength gain is remarkably fast for a particular period of time which is dependent on lime content. Furthermore, the strength gain on specimens cured at 40 °C is 8 times higher than that observed on specimens cured at 20 °C which highlights significant effect for the environmental temperature on accelerating the chemical reactions. Reduced dry unit weight due to increased resistance to compactability is observable with increasing lime content and higher environmental temperature. Accelerated pozzolanic reaction at higher environmental temperature resulted in permeability coefficient of specimens mellowed for 24 h at 40 °C to be higher than those mellowed at 20 °C. The results also highlighted that the permeability coefficient would be relatively stable when expansive clays were treated with small amounts of lime e.g. 5%.Version
Accepted ManuscriptCitation
Ali H and Mohamed M (2018) The effects of lime content and environmental temperature on the mechanical and hydraulic properties of extremely high plastic clays. Applied Clay Science. 161: 203-210.Link to Version of Record
https://doi.org/10.1016/j.clay.2018.04.012Type
Articleae974a485f413a2113503eed53cd6c53
https://doi.org/10.1016/j.clay.2018.04.012