Silva Yimmy Fernando, Villaquirán-Caicedo Mónica, Izquierdo Silvia
Concrete Innovation Hub UC (CIHUC), Composite Materials Group (CENM), School of Civil Construction, Faculty of Engineering, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile.
Composite Materials Group (CENM), School of Materials Engineering, Universidad del Valle, Cali 760042, Colombia.
Materials (Basel). 2023 Oct 13;16(20):6677. doi: 10.3390/ma16206677.
In this study, the effect on the flowability, compressive strength, absorption, sorptivity, and carbonation resistance of concrete with different copper slag (CS) replacement ratios was investigated. For this research, four concrete mixes with different percentages of CS were made (0%, 10%, 20%, and 30% of CS as replacement of cement by volume). In addition, the microstructure was analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), and thermogravimetric analysis (TG-DTG). The results shows that the incorporation of CS reduces the workability and compressive strength of the mixtures, being more significant in concrete with 30% CS. The carbonation depth of concrete with CS increases monotonically with increasing CS. In addition, the compressive strength of the carbonated (20% and 30% CS) concretes show a loss of compressive strength at 90 days of exposure when compared to their water-cured counterparts. The use of low percentages of CS does not generate a decrease in workability and its mechanical effect is not significant at prolonged ages, so the use of this waste as SCM in percentages close to 10% is a viable alternative to the sustainability of concrete and the management of this residue.
在本研究中，研究了不同铜渣（CS）替代率对混凝土的流动性、抗压强度、吸水率、吸渗性和抗碳化性的影响。为此项研究，制备了四种不同CS含量的混凝土混合料（CS按体积计分别替代水泥0%、10%、20%和30%）。此外，通过X射线衍射（XRD）、扫描电子显微镜（SEM）和热重分析（TG-DTG）对微观结构进行了分析。结果表明，掺入CS会降低混合料的工作性和抗压强度，在CS含量为30%的混凝土中更为显著。含CS混凝土的碳化深度随CS含量的增加而单调增加。此外，与水养护的对应混凝土相比，碳化（CS含量为20%和30%）混凝土在暴露90天时抗压强度有所损失。低含量CS的使用不会导致工作性降低，并且在长期龄期时其力学效应不显著，因此，以接近10%的比例将这种废弃物用作辅助胶凝材料对于混凝土的可持续性和这种残渣的管理来说是一种可行的选择。
