Role of Gypsum Content on the Long-Term Performance of Lime-Stabilised Soil

Mansour Ebailila, John Kinuthia, Jonathan Oti

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The role of gypsum level on the long-term strength and expansion of soil stabilised with different lime contents is not well understood. This research, therefore, studied the effect of varying gypsum concentrations of 0, 3, 6, and 9 wt% (equivalent to the sulfate contents of 0, 1.4, 2.8, and 4.2%, respectively) on the performance of sulfate soil stabilised with two lime levels (4 and 6 wt%). This was carried out to establish the threshold level of gypsum/lime (G/L) at which the increase in G/L ratio does not affect the performance of lime-stabilised sulfate soil. Both unconfined compressive strength (UCS) and expansion, along with the derivative thermogravimetric (DTG) analysis, were adopted to accomplish the present objective. Accordingly, the result indicated that the strength and expansion were proportional to the lime and sulfate content, of which a G/L ratio of 1.5 was the optimum case scenario for UCS, and at the same time, the worst-case scenario for expansion. This discovery is vital, as it is anticipated to serve as a benchmark for future research related to the design of effective binders for suppressing the sulfate-induced expansion in lime-stabilised gypseous soil.
    Original languageEnglish
    Article number5099
    Pages (from-to)1-14
    Number of pages14
    JournalMaterials
    Volume15
    DOIs
    Publication statusPublished - 22 Jul 2022

    Keywords

    • gypsum
    • gypseous soil
    • expansive soil
    • sulfate soil
    • ettringite
    • Calcium-based stabilizer
    • swelling
    • compressive strength
    • linear expansion

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