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Experimental Study of the Valorization of Sulfate Soils for Use as Construction Material

Author

Listed:
  • Andrés Seco

    (Department of Engineering, Institute of Smart Cities, Public University of Navarre, 31006 Pamplona, Spain)

  • Jesús María del Castillo

    (Department of Engineering, Institute of Smart Cities, Public University of Navarre, 31006 Pamplona, Spain)

  • Céline Perlot

    (Laboratoire SIAME, E2S UPPA, Université de Pau et des Pays de l’Adour, 64600 Anglet, France
    Institut Universitaire de France, 75231 Paris, France)

  • Sara Marcelino-Sádaba

    (Department of Engineering, Institute of Smart Cities, Public University of Navarre, 31006 Pamplona, Spain)

  • Eduardo Prieto

    (Department of Engineering, Institute of Smart Cities, Public University of Navarre, 31006 Pamplona, Spain)

  • Sandra Espuelas

    (Department of Engineering, Institute of Smart Cities, Public University of Navarre, 31006 Pamplona, Spain)

Abstract

This article shows an experimental investigation carried out for the stabilization of a sulfate soil. The stabilization was carried out in two phases: the first phase was the consumption of the sulfate present in the soil through its controlled transformation into ettringite. After this, a modified soil with lower maximum density, greater optimum moisture identified via standard proctor (SP) test, no plasticity and improved unconfined compressive strength (UCS) was obtained. In the second phase, the modified soil was stabilized by the use of different additives rich in oxides of calcium or magnesium, combined with by-products or waste materials containing reactive aluminum or silicon oxides. As a result, the mechanical strength of the modified soil was improved. In this phase, a binary binder composed of a magnesium oxide product and ground granulated blast-furnace slags (GGBS) obtained the highest UCS. The binary binder composed of lime and an alumina filler formed ettringite in the treated soil. This experiment allowed for the validation of a two-phase stabilization process and the non-conventional additives used, mainly magnesium oxide and GGBS, even for high-bearing-requirement pavement layers’ construction.

Suggested Citation

  • Andrés Seco & Jesús María del Castillo & Céline Perlot & Sara Marcelino-Sádaba & Eduardo Prieto & Sandra Espuelas, 2022. "Experimental Study of the Valorization of Sulfate Soils for Use as Construction Material," Sustainability, MDPI, vol. 14(11), pages 1-11, May.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:11:p:6609-:d:826377
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    Cited by:

    1. Wajeeha Qamar & Ammad Hassan Khan & Zia ur Rehman & Zubair Masoud, 2022. "Sustainable Application of Wool-Banana Bio-Composite Waste Material in Geotechnical Engineering for Enhancement of Elastoplastic Strain and Resilience of Subgrade Expansive Clays," Sustainability, MDPI, vol. 14(20), pages 1-14, October.

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