利用废铜渣作为自密实混凝土粗骨料进行环境保护。
Environmental protection by using waste copper slag as a coarse aggregate in self-compacting concrete.
机构信息
Department of Civil Engineering, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.
Materials and Structures Innovation Group, School of Engineering, University of Western Australia, Perth, WA, 6009, Australia; School of Engineering, Edith Cowan University, Joondalup, WA, 6027, Australia.
出版信息
J Environ Manage. 2020 Oct 1;271:111013. doi: 10.1016/j.jenvman.2020.111013. Epub 2020 Jul 2.
The copper production process causes waste and by-products called waste copper slag (WCS). A considerable amount of WCS is produced globally. This research aims to utilise WCS as an alternative to natural coarse aggregate in self-compacting concrete (SCC). To achieve this goal, WCS was utilised in different percentages (0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%) as a natural coarse aggregate replacement in SCC production. Following this, the fresh, mechanical, and durability characteristics of SCCs incorporating WCS as a partial replacement of coarse aggregates were investigated in-depth. Incorporating 100% WCS as coarse aggregates in SCCs showed 27%, 29%, and 26% growth in compressive, split, and flexural strengths in 28 days, respectively. The reduction of free drying shrinkage of the mixture containing 100% WCS compared to the control mixture was approximately 36%, and the water absorption of all the specimens was less than 6%. Further, the increase in weight for the mixture containing 100% WCS as coarse aggregates was less than 15% compared to the control mixture. A cost analysis of the SCCs showed that incorporating WCS for all coarse aggregates reduced production costs by 19%. Investigating the economic index of concrete containing WCS as a coarse aggregate showed that utilising the WCS in green SCC was feasible.
铜的生产过程会产生废铜渣（WCS）等废物和副产品。全球产生了相当数量的 WCS。本研究旨在将 WCS 用作自密实混凝土（SCC）中天然粗骨料的替代品。为了实现这一目标，将 WCS 以不同的百分比（0%、10%、20%、30%、40%、50%、60%、70%、80%、90%和 100%）用作 SCC 生产中天然粗骨料的替代品。在此基础上，深入研究了 WCS 作为部分粗骨料替代物掺入 SCC 时的新拌、力学和耐久性特性。将 100%WCS 用作 SCC 的粗骨料，其 28 天抗压、劈裂和弯曲强度分别增长了 27%、29%和 26%。与对照混合物相比，含有 100%WCS 的混合物的自由干燥收缩率降低了约 36%，所有试件的吸水率均小于 6%。此外，与对照混合物相比，含有 100%WCS 作为粗骨料的混合物的重量增加小于 15%。SCC 的成本分析表明，用 WCS 替代所有粗骨料可降低生产成本 19%。研究含 WCS 粗骨料的混凝土的经济指标表明，在绿色 SCC 中使用 WCS 是可行的。
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