- Title
- Intermittent swelling and shrinkage of a highly expansive soil treated with polyacrylamide
- Creator
- Soltani, Amin; Deng, An; Taheri, Abbas; O'Kelly, Brendan
- Date
- 2022
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/186578
- Identifier
- vital:16939
- Identifier
-
https://doi.org/10.1016/j.jrmge.2021.04.009
- Identifier
- ISBN:1674-7755 (ISSN)
- 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 PD = 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 PD = 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 PD = 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. © 2022 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
- Publisher
- Chinese Academy of Sciences
- Relation
- Journal of Rock Mechanics and Geotechnical Engineering Vol. 14, no. 1 (2022), p. 252-261
- Rights
- All metadata describing materials held in, or linked to, the repository is freely available under a CC0 licence
- Rights
- http://creativecommons.org/licenses/by-nc-nd/4.0/
- Rights
- Copyright @ 2022 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
- Rights
- Open Access
- Subject
- 4005 Civil engineering; 4019 Resources engineering and extractive metallurgy; Accumulated axial strain; Consistency limits; Expansive soil; Polyacrylamide (PAM); Sediment volume; Swelling and shrinkage strains; Swell–shrink cycles
- Full Text
- Reviewed
- Funder
- The work presented in this paper has been funded by the Australian Research Council (ARC) , Project No. DP140103004 . The first author also acknowledges The University of Adelaide for making this research study possible through the provision of an Australian Government Research Training Program Scholarship.
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