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Properties of a Terpolymer-Treated Soil: A 13C NMR Study

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Abstract

The Young’s modulus and the secant modulus of a terpolymer-treated soil as a function of the polymer’s characteristics are discussed in the context of a more general inelastic property known as the toughness parameter. The soil chosen was a sample of the State of Qatar subsoil. The terpolymer, designated TPAM, was characterized by a backbone structure of acrylamide, anionic carboxylate, and cationic (3-acrylamidopropyl-trimethylammonium chloride) repeat units. The backbone unit ratio was estimated from 13C NMR analyses. TPAM was synthesized by straightforward NaOH hydrolyses of an acrylamide/cationic copolymer. The correlations between the NaOH molarity of the hydrolysis solution, with the corresponding ratio of the anionic and cationic units, were shown to have a significant influence on the value of the toughness parameter. It is speculated that controlling the anionic and cationic ratio of a terpolymer is a general approach to optimize the toughness parameter of treated soils. Measurements of the molecular weight of TPAM were made, and comments on the importance of this feature are given. The equivalent viscosity was also recorded. It is pointed out that the work is particularly relevant to the practical problem of subsoil pavement stabilization in which the terpolymer acts as a soil binder. Suggestions on further work are given.

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Notes

  1. The subsoil (or subgrade) is loosely defined as the natural layer of soil underneath a constructed pavement. Stabilization strengthens this layer and thus the pavement. As the name implies, a stabilization binder is a material that entraps, or interacts with, the soil particles.

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Acknowledgements

The authors would like to acknowledge the Qatar National Research Fund (a member of the Qatar Foundation) for their support under the NPRP award [NPRP 5-508-2-204]. We are also especially grateful to Professor Svetlana Sukhishvili for her insightful comments and suggestions.

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Authors and Affiliations

  1. Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia

    Leesa M. Smith

  2. Department of Mechanical Engineering, Texas A&M University at Qatar, Education City, Doha, Qatar

    Ayyavu Chandramohan & Srinath R. Iyengar

  3. Material Science and Engineering Department, Texas A&M University, College Station, TX, USA

    Parvin Karimineghlani

  4. Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra, Australia

    Howard J. M. Hanley

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  1. Leesa M. Smith
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  2. Ayyavu Chandramohan
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  4. Srinath R. Iyengar
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  5. Howard J. M. Hanley
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Correspondence to Howard J. M. Hanley.

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Smith, L.M., Chandramohan, A., Karimineghlani, P. et al. Properties of a Terpolymer-Treated Soil: A 13C NMR Study. Int J Thermophys 40, 5 (2019). https://doi.org/10.1007/s10765-018-2463-3

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  • DOI: https://doi.org/10.1007/s10765-018-2463-3

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