Pavement Subgrade Stabilization Using Polymers: Characterization and Performance

Iyengar, Srinath R.; Masad, Eyad; Rodriguez, Ana K.; Bazzi, Hassan S.; Little, Dallas N.; Hanley, H. J. M.

doi:10.1061/(asce)mt.1943-5533.0000612

Cited by 89 publications

(42 citation statements)

References 12 publications

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“…As pointed out in the previous study (Iyengar et al 2013), the Qatari soil is predominantly composed of limestone and when wetted, the surface of limestone particles becomes electropositive (Heffer et al 2005). Hence, the observed strength and stiffness performance of HPAM and the polyampholyte TPAM, both containing anionic groups, can be discussed in terms of an methylene and to the groups N + −(CH 2 ) 3 , CH 2 −N + −(CH 3 ) 3 and −NH−CH 2 (Patrizi et al 2009), respectively.…”

Section: Mechanical Data: Ucs and Stiffness Modulusmentioning

confidence: 85%

“…Following the work of Iyengar et al (2013), the Qatari subgrade soil used here was provided by the Arab Centre for Engineering Studies, Doha, Qatar. The natural moisture content of this soil was estimated to be approximately 4.75%.…”

Section: Methodsmentioning

confidence: 99%

“…Other compounds were calcite, gypsum, seussite (silicon sulphide), quartz and a small percentage of magnesium manganese oxide. Details are given by Iyengar et al (2013).…”

Section: Methodsmentioning

confidence: 99%

“…Based on the investigation of commercial PAM polymer binders by Iyengar et al (2013), it was determined that the optimum dosage of cement to the soil was 9.0% per dry weight of soil; the optimum dosage of the PAM binder 50% w/w aqueous solutions was 2.0% per dry weight of soil. Similar dosages were used in this study.…”

Section: Sample Preparationmentioning

confidence: 99%

“…While the most common stabilisation binder is cement, a polymer-based binder can be a viable choice, as several authors have shown (for example: Barvenik 1994, Levy and Ben-Hur 1997, Orts et al 2007, Marin et al 2010, Baghini et al 2014. Specifically, Iyengar and co-workers discussed in a previous paper (Iyengar et al 2013) a methodology to compare quantitatively selected alternative commercial polymers solutions that were considered as potential stabilisers for Qatari subgrade soil. Qatari soil was selected largely because the State of Qatar is experiencing a tremendous growth in transportation infrastructure and stabilisation is of economic significance.…”

Section: Introductionmentioning

confidence: 99%

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Polyampholyte polymer as a stabiliser for subgrade soil

Rodriguez

Chandramohan

Iyengar

et al. 2016

International Journal of Pavement Engineering

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a texas a&m university at Qatar, education City, Doha, Qatar; b Zachry Department of Civil engineering, texas a&m university, College Station, tX, uSa; c research School of Physics and engineering, the australian national university, Canberra, australia ABSTRACT This study evaluates the potential of selected ionic polymers to act as pavement subgrade binders. Investigations were based on their relative performance with a Qatari soil which was selected as typical of a pavement subgrade to be found in the Middle East and North African region. The polymeric binders chosen were three synthetic ionic variations of polyacrylamide: cationic poly(acrylamidopropyl trimethyl ammonium chloride) (designated PAMTAC), anionic hydrolysed poly(acrylamide) (HPAM) and the ampholitic terpolymer poly(acrylamide-co-sodiumacrylate-co-(3-acrylamidopropyl) trimethylammonium chloride) (TPAM). The polymers were characterised by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic spectroscopy ( 1 H-NMR and 13 C-NMR). The comparative performance of the polymertreated soil was judged on the basis of results obtained from selected standard mechanical test data: specifically, the unconfined compressed strength, the stiffness modulus and the toughness. It is concluded that a 50% w/w aqueous solution of the ampholitic terpolymer applied at a dosage of 2.0% by dry weight of the soil gives the best subgrade stabilisation. Of some significance, it is further noted that this ampholitic polymer was superior as a binding agent to the traditional standard, Portland cement, judged under equivalent but nonstandard conditions. Modifying the polymer to act as a binder for subgrade soils in general is also discussed.

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Section: Mechanical Data: Ucs and Stiffness Modulusmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

“…Other compounds were calcite, gypsum, seussite (silicon sulphide), quartz and a small percentage of magnesium manganese oxide. Details are given by Iyengar et al (2013).…”

Section: Methodsmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%