2026-04-13T04:04:38Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1884402025-12-04T20:57:29Zcom_2072_1057col_2072_478796col_2072_478917

00925njm 22002777a 4500 dc Maldonado Alameda, Alex author Giró Paloma, Jessica author Andreola, Fernanda author Barbieri, Luisa author Chimenos Ribera, Josep Ma. author Lancellotti, Isabella author 2022-08-26T10:00:55Z 2022-08-26T10:00:55Z 2022-04-11 2022-08-26T10:00:55Z Alkali-activated binders (AABs) stand out as promising candidates to replace ordinary Portland cement (OPC) since waste can be used as raw material for their manufacture. This study addresses the environmental feasibility of using weathered bottom ash (WBA) and metakaolin (MK) as alkali-activated binder precursors (AA-WBA/MK). Different proportions of WBA and MK were mixed (100/0, 75/25, 50/50, 25/75, and 0/100 wt%) with a mixture of waterglass (WG) and NaOH 8 M as an alkaline activator solution. The effect of increasing MK content was assessed from a chemical, physical, mechanical, and environmental perspective. The results revealed the formation of secondary reaction products of C-(A)-S-H, (C,N)-A-S-H, and N-A-S-H gels. The compressive strength of AA-WBA/MK binders decreased (from 61.6 MPa to 12.6 MPa) as the MK content increased. The monolithic tank test validated the use of AA-WBA/MK binders for construction purposes, although with some restrictions due to their content in As, Sb, and V. Finally, the encapsulation efficiency and mechanical performance of AA-WBA/MK binders was enhanced as the curing period increased. Incineració Indústria de la construcció Metal·lúrgia Incineration Construction industry Metallurgy Weathered bottom ash from municipal solid waste incineration: Alkaline activation for sustainable binders