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.

中文翻译：

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细度对水泥尾矿回填中铜镍渣火山灰活性的影响

本文给出了细度对水泥尾矿回填中铜镍渣火山灰活性影响的实验结果。制备不含或含有不同研磨时间的Cu-Ni炉渣的水泥浆和水泥尾矿回填样品，并在20°C下固化7、28和150天。进行机械测试和微观结构分析。通常，Cu-Ni渣的火山灰活性随粒度的细化而增加。胶结尾矿回填样品的强度随添加Cu-Ni炉渣而降低。发现本研究中使用的Cu-Ni渣的火山灰活性相对较低。根据细度，Cu-Ni炉渣会使胶结尾矿回填样品变松或致密。对于包含研磨30分钟至50分钟的Cu-Ni渣的样品，