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

Andres Seco, Jesus María del Castillo, Sandra Espuelas, Sara Marcelino-Sadaba and Benat Garcia
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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

Sustainability, 2021, vol. 13, issue 6, 1-16

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.

Keywords: spent refractory materials; waste valorization; soil stabilization; binders; sustainable construction (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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