Intermittent swelling and shrinkage of a highly expansive soil treated with polyacrylamide

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dc.contributor.authorSoltani, A.
dc.contributor.authorDeng, A.
dc.contributor.authorTaheri, A.
dc.contributor.authorO’Kelly, B.C.
dc.date.issued2022
dc.description.abstractThis 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.
dc.description.statementofresponsibilityAmin Soltani, An Deng, Abbas Taheri, Brendan C. O’Kelly
dc.identifier.citationJournal of Rock Mechanics and Geotechnical Engineering, 2022; 14(1):252-261
dc.identifier.doi10.1016/j.jrmge.2021.04.009
dc.identifier.issn1674-7755
dc.identifier.issn2589-0417
dc.identifier.orcidDeng, A. [0000-0002-3897-9803]
dc.identifier.orcidTaheri, A. [0000-0003-4176-5379]
dc.identifier.urihttps://hdl.handle.net/2440/134602
dc.language.isoen
dc.publisherElsevier BV
dc.relation.granthttp://purl.org/au-research/grants/arc/DP140103004
dc.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 (http://creativecommons.org/licenses/by-nc-nd/4.0/).
dc.source.urihttps://doi.org/10.1016/j.jrmge.2021.04.009
dc.titleIntermittent swelling and shrinkage of a highly expansive soil treated with polyacrylamide
dc.typeJournal article
pubs.publication-statusPublished

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