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Biopolymer stabilization of clayey soil

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This study investigates the efficacy of sodium alginate(SA),xanthan gum(XG),guar gum(GG)and chitosan(CS)—each applied at five different solid biopolymer-to-water mass ratios(or dosages)and cured for 7 d and 28 d-on the unconfined compressive strength(UCS)performance of a high plasticity clayey soil.Moreover,on identifying the optimum biopolymer-treatment scenarios,their performance was compared against conventional stabilization using hydrated lime.For a given curing time,the UCS for all biopolymers followed a rise-fall trend with increasing biopolymer dosage,peaking at an optimum dosage and then subsequently decreasing,such that all biopolymer-stabilized samples mobilized higher UCS values compared to the unamended soil.The optimum dosage was found to be 1.5％for SA,XG and CS,while a notably lower dosage of 0.5％was deemed optimum for GG.Similarly,for a given biopolymer type and dosage,increasing the curing time from 7 d to 28 d further enhanced the UCS,with the achieved improvements being generally more pronounced for XG-and CS-treated cases.None of the investigated biopolymers was able to produce UCS improvements equivalent to those obtained by the 28-d soil-lime samples;however,the optimum XG,GG and CS dosages,particularly after 28 d of curing,were easily able to replicate 7-d lime stabilization outcomes achieved with as high as twice the soil's lime demand.Finally,the fundamental principles of clay chemistry,in conjunction with the soil mechanics framework,were employed to identify and discuss the clay-biopolymer stabilization mechanisms.

Soil stabilizationHigh plasticity clayBiopolymer dosageHydrated limeCuring timeUnconfined compressive strength(UCS)

Mahdieh Azimi、Amin Soltani、Mehdi Mirzababaei、Mark B.Jaksa、Nanjappa Ashwath

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College of Engineering and Aviation,School of Engineering and Technology,CQUniversity,Melbourne,VIC 3000,Australia

Institute of Innovation,Science and Sustainability,and Future Regions Research Center,Federation University,Churchill,VIC 3842,Australia

Department of Infrastructure Engineering,Faculty of Engineering and Information Technology,The University of Melbourne,Parkville,VIC 3010,Australia

School of Architecture and Civil Engineering,The University of Adelaide,Adelaide,SA 5005,Australia

School of Health,Medical and Applied Sciences,CQUniversity,Rockhampton,QLD 4701,Australia

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an Australian Government Research Training Program(RTP)scholarship

2024

10.1016/j.jrmge.2023.12.020

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(7)