Application of electric arc furnace slag as an alternative precursor to blast furnace slag in alkaline cements

IF 4.7 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Sustainable Cement-Based Materials Pub Date : 2022-12-28 DOI:10.1080/21650373.2022.2161660

N. Cristelo, J. Coelho, J. Rivera, I. García-Lodeiro, T. Miranda, A. Fernández-Jiménez

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引用次数: 1

Abstract

In 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 characterized from a mechanical and microstructural perspective. Selected pastes were used to prepare mortars, using EAFS as aggregate. Results showed that EAFS alone doesn’t deliver an adequate strength. However, when combined with BFS and FA, it formed compact matrices with significant mechanical strength and lower hydration heat. The use of EAFS as aggregate produced higher strength than obtained with silica sand. EAFS showed the potential to be applied as a precursor in alkaline cements, and the combination of BFS/EAFS yielded higher compressive strengths than obtained with BFS alone.

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电弧炉渣替代高炉炉渣在碱性水泥中的应用

在钢铁制造业中，电弧炉越来越普遍，因为它们主要使用废金属作为矿石来源。因此，高炉炉渣（BFS）在减少，而电弧炉渣（EAFS）在成比例地增加。本研究的重点是EAFS在碱性水泥中作为前驱体或骨料的潜力。用NaOH溶液活化不同的EAFS/BFS混合物，其中一些包括飞灰（FA），并从机械和微观结构的角度进行表征。选定的浆料用于制备砂浆，使用EAFS作为骨料。结果表明，EAFS单独不能提供足够的强度。然而，当与BFS和FA结合时，它形成了具有显著机械强度和较低水化热的致密基体。使用EAFS作为骨料比使用硅砂获得的强度更高。EAFS显示出在碱性水泥中作为前体应用的潜力，并且BFS/EAFS的组合产生了比单独使用BFS获得的更高的抗压强度。

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来源期刊

Journal of Sustainable Cement-Based Materials Multiple-

CiteScore

6.60

自引率

15.90%

发文量

期刊介绍： The Journal of Sustainable Cement-Based Materials aims to publish theoretical and applied researches on materials, products and structures that incorporate cement. The journal is a forum for discussion of research on manufacture, hydration and performance of cement-based materials; novel experimental techniques; the latest analytical and modelling methods; the examination and the diagnosis of real cement and concrete structures; and the potential for improved cement-based materials. The journal welcomes original research papers, major reviews, rapid communications and selected conference papers. The Journal of Sustainable Cement-Based Materials covers a wide range of topics within its subject category, including but are not limited to: • raw materials and manufacture of cement • mixing, rheology and hydration • admixtures • structural characteristics and performance of cement-based materials • characterisation techniques and modeling • use of fibre in cement based-materials • degradation and repair of cement-based materials • novel testing techniques and applications • waste management