Promotion of Circular Economy: Steelwork Dusts as Secondary Raw Material in Conventional Mortars

Proceedings

Fernández, José María¹  Lozano-Lunar, Angélica²  Barbudo, Auxi³  Jiménez, José Ramón⁴ 

[1] Authors to whom correspondence should be addressed.;Construction Engineering Area, EPS of Belmez, University of Córdoba, 14240 Córdoba, Spain;Inorganic Chemistry Area, EPS of Belmez, University of Córdoba, 14240, Spain;Presented at Environment, Green Technology and Engineering International Conference (EGTEIC 2018), Caceres, Spain, 18–20 June 2018.

关键词: steelwork dusts;    secondary raw material;    construction material;   

DOI  :  10.3390/proceedings2201313

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

Among the actions proposed by the European Union for the implementation of Circular Economy is the use of waste as a secondary raw material (SRM). During the fusion of the scrap, a steel dust is generated, named Electric Arc Furnace Dust (EAFD). The EAFD is composed mainly of potentially leachable heavy metals, so is classified as “hazardous” waste. Around the world, approximately 70% of this waste is deposited in landfills, with a previous treatment through cement-based materials to prevent the metals’ mobility. However, this action is not in accordance with the Circular Economy concept due to the greater use of resources and the loss of deposited metals. The present investigation analyses the use of EAFD as SRM in conventional mortar production for its use as a construction material. Different substitution percentages (25%, 50% and 100%) were used replacing siliceous filler by EAFD. The investigation analysed the behaviour of conventional mortars by tests of workability, compressive strength, water absorption by capillarity and leaching behaviour in granular and monolithic state. The results obtained indicate a slight improvement in mechanical behaviour with the incorporation of EAFD, the reason why its use as SRM in conventional mortars would benefit the construction industry and would encourage the Circular Economy. From an environmental point of view, the mechanisms of Pb fixation should be improved in granular state.

【 授权许可】

CC BY