López-Uceda Antonio, Cantador-Fernández David, Da Silva Pedro Raposeiro, de Brito Jorge, Fernández-Rodríguez José María, Jiménez José Ramón
Área de Ciencia de los Materiales e Ingeniería Metalúrgica, Ed. Leonardo Da Vinci, Campus de Rabanales, Universidad de Córdoba, 14071 Cordoba, Spain.
Área de Química Inorgánica, Universidad de Córdoba, Avda. de la Universidad s/n, 14240 Belmez, Spain.
Materials (Basel). 2022 Aug 3;15(15):5347. doi: 10.3390/ma15155347.
This study is framed within the circular economy model through the valorisation of industrial by-products. This research shows the results of producing self-compacting mortars (SCMs) with electric arc furnace dust (EAFD) and other industrial by-products such as fly ash, conforming (FA) or not conforming (NcFA), from coal-fired power plants, or recovery filler (RF) from hot-mix asphalt plants. Three batches of SCMs, each with one industrial-by product (FA, NcFA, or RF), and three levels of EAFD ratio incorporation (0%, 10%, 20%), were tested. An extra batch with a greater amount of FA was manufactured. When the incorporation ratio of EAFD rose, the mechanical strength decreased, due to the presence of a calcium zinc hydroxide dihydrate phase; nevertheless, this decrease diminished over time. All SCM mixes, except the 40C 40FA 20 EAFD mix, were above 20 MPa at 28 days. All mixes named 70C and 40C reached 40 and 30 MPa, respectively, at 90 days. Mixes with EAFD showed less capillarity and no difference in water absorption by immersion with respect to mixes without EAFD after 91 days. The SCMs designed proved to be stable in terms of leaching of the heavy metals contained in EAFD, where all the hardened SCMs were classified as inert.
本研究通过对工业副产品进行增值利用，构建于循环经济模式框架内。本研究展示了利用电弧炉粉尘（EAFD）以及其他工业副产品（如来自燃煤电厂的符合标准（FA）或不符合标准（NcFA）的粉煤灰，或来自热拌沥青厂的回收填料（RF））生产自密实砂浆（SCM）的结果。测试了三批SCM，每批含有一种工业副产品（FA、NcFA或RF），以及三种电弧炉粉尘掺入比例水平（0%、10%、20%）。还制造了一批含有更多粉煤灰的额外批次。随着电弧炉粉尘掺入比例的增加，由于二水合氢氧化钙锌相的存在，机械强度降低；然而，这种降低会随着时间推移而减小。除了40C 40FA 20 EAFD混合料外，所有SCM混合料在28天时均高于20 MPa。所有命名为70C和40C的混合料在90天时分别达到40和30 MPa。含有电弧炉粉尘的混合料毛细作用较小，并且在91天后，与不含电弧炉粉尘的混合料相比，浸泡吸水率没有差异。所设计的SCM在电弧炉粉尘中所含重金属的浸出方面表现稳定，所有硬化后的SCM均被归类为惰性材料。
