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Circular Economy
Tabla 1. Mortar mix proportions
Mortartype CEM NA ARH SF EAFD Water w/c Consistency
(g)
NA-REF 1200 NAFD/2:1 799 ARH-REF 1200 ARHFD/2:1 799
(g) (g)
1600 - 1065 -
- 1600 - 1065
(g) (g) (g) (mm)
1200 - 1050 799 1337 1194 1200 - 1233 799 1337 1628
0.88 236 1.49 224 1.03 234 2.04 236
3. Results and conclusions
The conditions that the mortar must have to be considered a solid at 28 days of age must be at least 1 MPa of compressive strength, 0.1 MPa of indirect tensile strength and the rate of delitescence after immersion must be lower of 10%.
With the use of ARH for the immobilization of EAFD compression resistances of 7.35 MPa were obtained, well above the 1 MPa required. The density of the mortar hardened only under 17% with respect to the reference mortar.
The concentration of heavy metals was reduced and allows these types of waste to be landfilled. In conclusion we can say that the use of ARH is a viable alternative for the immobilization of EAFD
4. Acknowledgment
The authors would like to thank the spanish public company ENRESA (Empresa Nacional de Residuos Radiactivos S.A.) for financial support this research via project (035-ES-IN-0140). This work was partly supported by the Andalusian Regional Government (Research Groups FQM-391 and TEP-227) and XXI Own Program for the Promotion of Research at the University of Córdoba – Modality 4.2.
5. References
Jin, F., & Al-Tabbaa, A. (2014). Evaluation of novel reactive MgO activated slag binder for the immobilisation of lead and
zinc. Chemosphere, 117, 285-294.
Navarro-Blasco, I., Duran, A., Sirera, R., Fernández, J. M., & Alvarez, J. I. (2013). Solidification/stabilization of toxic
metals in calcium aluminate cement matrices. Journal of hazardous materials, 260, 89-103.
Sofilić, T., Rastovčan-Mioč, A., Cerjan-Stefanović, Š., Novosel-Radović, V., & Jenko, M. (2004). Characterization of steel
mill electric-arc furnace dust. Journal of hazardous materials, 109(1-3), 59-70.
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