2026-04-13T07:03:16Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1966112025-12-04T20:56:01Zcom_2072_1057col_2072_478796col_2072_478917

Sustainable magnesium phosphate micromortars formulated with PAVAL® alumina by-product as micro-aggregate Huete Hernández, Sergio Maldonado Alameda, Alex Alfocea Roig, Anna Giro Paloma, Jessica Chimenos Ribera, Josep Ma. Formosa, Joan Propietats mecàniques Microestructura Mechanical properties Microstructure Magnesium phosphate cement (MPC) is an attractive alternative to Portland cement (PC) since it can also be obtained using by-products and wastes as raw materials. This research uses low-grade MgO (LG-MgO) as a magnesium source to obtain MPC, reducing CO2 emissions related to MPC production. The obtained binder can be referred to as 'sustainable MPC' (sust-MPC). Moreover, this investigation incorporates a by-product obtained in the aluminium recycling process, named PAVAL® (PV). The addition of PV (5, 17.5, and 35 wt.%) and water to solid (W/S) ratio (0.23, 0.25, 0.28, and 0.31) were studied in terms of mechanical and fresh properties, leaching behaviour, and microstructure to evaluate the degree of PV inclusion in the K-struvite matrix. The addition of PV into sust-MPC improves the mechanical behaviour of the micromortars, indicating a good inclusion of PV. The mechanical and fresh behaviour of the formulations, and BSEM-EDS analysis revealed the potential chemical interaction between Al and K-struvite matrix. The addition of 17.5 wt.% of PV with a W/S of 0.25 showed the best mechanical performance (∼40 MPa of compressive strength at 28 days of curing). The amount of PV should be lower than 17.5 wt.% to classify it as non-hazardous material at the end-of-life. 2023-04-12T10:19:42Z 2023-04-12T10:19:42Z 2023-02-20 2023-04-12T10:19:42Z info:eu-repo/semantics/article 0366-3175 https://hdl.handle.net/2445/196611 732116 eng https://doi.org/10.1016/j.bsecv.2023.02.001 Boletin de la Sociedad Española de Ceramica y Vidrio, 2023 https://doi.org/10.1016/j.bsecv.2023.02.001 cc-by-nc-nd (c) Sociedad Española de Ceramica y Vidrio, 2023 https://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess 6 p. application/pdf Consejo Superior de Investigaciones Científicas (CSIC) Articles publicats en revistes (Ciència dels Materials i Química Física)