Fineness Effect on Pozzolanic Activity of Cu-Ni Slag in Cemented Tailing Backfill

• Published in: Advances in materials science and engineering Vol. 2020; no. 2020; pp. 1 - 7
• Main Authors: Guo, Lijie, Li, Wenchen, Yang, Xiaocong, Xu, Wenyuan
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Publishing Corporation 2020; Hindawi; Hindawi Limited
• Subjects: Achievement tests; Backfill; Cement hydration; Cement paste; Cementing; Chemical elements; Copper; Curing; Environmental impact; Fineness; Hydraulics; Mechanical tests; Metallurgy; Nickel; Particle size; Slag
• ISSN: 1687-8434; 1687-8442
• DOI: 10.1155/2020/7172890

This paper presents the experimental results of the fineness effect on the pozzolanic activity of Cu-Ni slag in cemented tailing backfill. Cement paste and cemented tailing backfill samples that without or contain Cu-Ni slag with various grinding times were made and cured at 20°C for 7, 28, and 150 days. Mechanical test and microstructural analyses are performed. In general, the pozzolanic activity of Cu-Ni slag increases with the fineness of particle size. The strength of cemented tailing backfill samples decreased with the addition of Cu-Ni slag. It was found that the pozzolanic activity of Cu-Ni slag used in this study is relatively low. According to the fineness, the Cu-Ni slag will make the cemented tailing backfill samples looser or denser. For the sample containing ground Cu-Ni slag ground for 30 min to 50 min, the sample becomes dense gradually as the particle size of Cu-Ni slag becomes finer.