Copper Slag of Pyroxene Composition as a Partial Replacement of Natural Aggregate for Concrete Production

Minerals

Aleksandar Radević¹  Dimitrije Zakić¹  Olivera Đokić²  Sandra Filipović³ 

[1] Faculty of Civil Engineering, The University of Belgrade, 11000 Belgrade, Serbia;Highway Institute Belgrade, 11010 Belgrade, Serbia;Mining and Metallurgy Institute Bor, 19210 Bor, Serbia;

关键词: copper slag;    recycled aggregate;    natural aggregate;    concrete;    compressive strength;    water permeability;   

DOI  :  10.3390/min11050439

来源: DOAJ

【 摘 要 】

Copper slag, a by-product of the pyrometallurgical process used for obtaining copper from copper ore in Bor, Serbia, contains mainly silicon, iron, calcium, and aluminium oxides. Due to such properties, it is disposed of in landfills. Despite the favourable technical properties copper slag aggregates possess, such as low-water absorption (WA₂₄ 0.6%), low resistance to fragmentation (LA 10%), and low resistance to wear (M_DE 4%), its use in the construction industry is still limited. The results of testing the technical properties of copper slag aggregates (CSAs) as a potential replacement for natural river aggregate (RA) are presented in this paper. The experiments included tests on three concrete mixtures with partial replacement of coarse natural aggregate with copper slag. The replacement of RA particle sizes of 8/16 mm and 16/31.5 mm with CSA in the amount of 20% + 50% and 50% + 50% resulted in an increase in the compressive strength of 12.4% and 10.5%, respectively. The increase of CSA content led to a decrease in water penetration resistance and salt-frost resistance of concrete, whereas the resistance to chloride ion penetration did not change significantly.

【 授权许可】

Unknown