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Type: Journal article
Title: Intermittent swelling and shrinkage of a highly expansive soil treated with polyacrylamide
Author: Soltani, A.
Deng, A.
Taheri, A.
O’Kelly, B.C.
Citation: Journal of Rock Mechanics and Geotechnical Engineering, 2022; 14(1):252-261
Publisher: Elsevier BV
Issue Date: 2022
ISSN: 1674-7755
Statement of
Amin Soltani, An Deng, Abbas Taheri, Brendan C. O’Kelly
Abstract: This laboratory study examines the potential use of an anionic polyacrylamide (PAM)-based material as an environmentally sustainable additive for the stabilization of an expansive soil from South Australia. The experimental program consisted of consistency limits, sediment volume, compaction and oedometer cyclic swell–shrink tests, performed using distilled water and four different PAM-to-water solutions of P(D) = 0.1 g/L, 0.2 g/L, 0.4 g/L and 0.6 g/L as the mixing liquids. Overall, the relative swelling and shrinkage strains were found to decrease with increasing number of applied swell–shrink cycles, with an ‘elastic equilibrium’ condition achieved on the conclusion of four cycles. The propensity for swelling/shrinkage potential reduction (for any given cycle) was found to be in favor of increasing the PAM dosage up to P(D) = 0.2 g/L, beyond which the excess PAM molecules self-associate as aggregates, thereby functioning as a lubricant instead of a flocculant; this critical dosage was termed ‘maximum flocculation dosage’ (MFD). The MFD assertion was discussed and validated using the consistency limits and sediment volume properties, both exhibiting only marginal variations beyond the identified MFD of P(D) = 0.2 g/L. The accumulated axial strain progressively transitioned from ‘expansive’ for the unamended soil to an ideal ‘neutral’ state at the MFD, while higher dosages demonstrated undesirable ‘contractive’ states.
Rights: © 2022 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BYNC- ND license (
DOI: 10.1016/j.jrmge.2021.04.009
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Appears in Collections:Civil and Environmental Engineering publications

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