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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...
Iron and aluminium production wastes as exclusive components of alkali activate...
Cristelo, Nuno; Castro, Fernando; Miranda, Tiago F. S.; Abdollahnejad, Zahra; Fernández-Jiménez, AnaThe sustainability of resources is becoming a worldwide concern, including construction and building materials, especially with the alarming increase rate in global population. Alternative solutions to ordinary Portland cement (OPC) as a concrete binder are being studied, namely the so-called alkali-activated cements (AAC). These are less harmful to the environment, as lower CO<sub>2</sub> emissions are associa...
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...
Stabilisation of a plastic soil with alkali activated cements developed from in...
Cristelo, Nuno; Rivera, Jhonathan; Miranda, Tiago; Fernández-Jiménez, AnaThe development of alternative materials for the construction industry, based on different types of waste, is gaining significant importance in recent years. This is mostly due to the need to increase sustainability of this heavily polluting activity, thus mitigating the dependence on, for instance, Portland cement. The present paper is related to the development of an alkaline activated cement (AAC) exclusivel...