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Stabilization of a Clay Soil Using Cementing Material from Spent Refractories and Ground-Granulated Blast Furnace Slag

Author

Listed:
  • Andres Seco

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

  • Jesus María del Castillo

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

  • Sandra Espuelas

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

  • Sara Marcelino-Sadaba

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

  • Benat Garcia

    (Department of Mining and Metallurgical Engineering and Materials Science, Faculty of Engineering Vitoria-Gasteiz, University of Basque Country UPV/EHU, 01006 Vitoria-Gasteiz, Spain)

Abstract

Nowadays, huge amounts of refractory materials are generated around the world. The majority of them lack valorization methods. This study analyzes the ability of a doloma and two magnesia spent refractory wastes as soil stabilizers on their own, as well as when combined with Ground-Granulated Blast Furnace Slags (GGBS). These materials showed a limited ability for the soil’s plasticity modification from a plasticity index of 15.6 to a minimum of 12.7. The high pH of the additives increased the soil’s pH from 7.88 to values in the range of 10.94–11.25 before the 28 days, allowing the development of the pozzolanic reactions. Unconfined compressive strength (UCS) increased along the curing time, reaching a maximum value of 5.68 MPa after 90 days. Based on the UCS, the optimum refractory GGBS ratios oscillate between 30:70 and 50:50. The UCS values after soaking samples reduced the unsoaked results between 68.70% to 94.41%. The binders considered showed a low effect against the soil swelling and the lack of delayed expansive effects because of the MgO hydration. Finally, X Ray Diffraction (XRD) tests showed that the stabilization only slightly modified the combinations of mineralogy and the formation of Magnesium Silicate Hydrate (MSH) gels.

Suggested Citation

  • Andres Seco & Jesus María del Castillo & Sandra Espuelas & Sara Marcelino-Sadaba & Benat Garcia, 2021. "Stabilization of a Clay Soil Using Cementing Material from Spent Refractories and Ground-Granulated Blast Furnace Slag," Sustainability, MDPI, vol. 13(6), pages 1-16, March.
  • Handle: RePEc:gam:jsusta:v:13:y:2021:i:6:p:3015-:d:514096
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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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