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Utilization of electric arc furnace slag in sustainable hydraulic binders
Coelho, João DiogoGrowing concerns about the possible depletion of natural resources have developed a search for more sustainable practices, which allow preserving natural resources and, at the same time, the reuse of existing industrial wastes and by-products. Therefore, this research work focused on the development of more sustainable binders, namely alkaline cements and alkaline hybrid cements, incorporating mostly electric a...
Application of electric arc furnace slag as an alternative precursor to blast f...
Cristelo, Nuno; Coelho, João Diogo; Rivera, Jhonathan; Garcia-Lodeiro, Inés; Miranda, Tiago F. S.; Fernández-Jiménez, AnaIn steel manufacturing, electric arc furnaces are increasingly common, as they use mostly scrap metal as ore source. Thus, blast furnace slag (BFS) is decreasing, while electric arc slag (EAFS) is proportionally increasing. This study focuses on the potential of EAFS in alkaline cements, as precursor or aggregate. Different EAFS/BFS mixtures, some including fly ash (FA), were activated with a NaOH solution, and...
Compressed earth blocks stabilized with glass waste and fly ash activated with ...
Rivera, Jhonathan; Coelho, João Diogo; Silva, Rui André Martins; Miranda, Tiago F. S.; Castro, Fernando; Cristelo, NunoSustainable alternatives are increasingly demanded as a sound response, from the construction industry, to the worldwide growing concerns with the environment. Such effort is justifiable by the degree of the contribution of this human activity to the problem, and it has thus propelled the development of a major trend in terms of funded research. The study reported in this paper focused on the physical-mechanica...
One-part hybrid cements from fly ash and electric arc furnace slag activated by...
Cristelo, Nuno; Garcia-Lodeiro, Inés; Rivera, Jhonathan Fernando; Miranda, Tiago F. S.; Palomo, Ángel; Coelho, João Diogo; Fernández-Jiménez, AnaAn innovative hybrid cement, based on type F fly ash (FA), iron and steel slag (ISS) and Portland cement (OPC), is proposed in the present paper. The precursors were activated by powder-form elements – sodium sulphate or sodium chloride – forming what is known as a ‘one part geopolymer’ cement, which was then evaluated considering both mechanical and microstructural perspectives. Results showed that, in these c...
Utilização de rejeitado da Mina de Neves Corvo no fabrico de misturas geopolimé...
Coelho, João DiogoNeste trabalho foi realizada uma caracterização física, mecânica, microestrutural e ambiental de um resíduo, designado por “rejeitado”, produzido pela exploração mineira de Neves Corvo. Seguiu-se a investigação do potencial de cinzas volantes (outro resíduo produzido de forma maciça no nosso país) ativadas alcalinamente na estabilização química deste rejeitado, ao nível do comportamento mecânico e do comportame...