Copper-based antimicrobial admixtures have been favoured for mitigating microbially induced concrete corrosion (MICC) owing to their practical bactericidal abilities. However, concerns regarding the leachability of hazardous components and the long-term efficacy of these admixtures have hindered their industrial application, with limited understanding of their comparative antimicrobial performance and mechanisms. In this work, three conventional copper compounds (copper sulphate, copper acetate, and copper oxide) and two newly synthesized copper-modified admixtures (copper-exchanged montmorillonite and copper-chelated chitosan) were evaluated and compared in terms of their impact on the properties, biocorrosion resistance, and environmental impact of cement paste. The findings revealed that the inclusion of copper-containing admixtures led to increased slump flow, extended setting time, improved compressive strength, lowered porosity, and reduced corrosion depth in the cement paste. Compared with copper sulphate and copper oxide, copper acetate exhibited superior engineering properties, antimicrobial performance, and reduced copper ion leaching. Cu-modified montmorillonite emerged as the most effective copper-based antimicrobial agent, considerably reducing the corrosion depth of cement paste by 32.8 % with the lowest copper leaching, suggesting its potential as a sustainable solution for antimicrobial concrete applications. In contrast, adding chitosan led to poor mechanical and adverse antimicrobial performance, indicating its limited potential as a carrier for synthesized antimicrobial agents.

中文翻译：

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新型铜基抗菌外加剂减轻水泥浆生物腐蚀的评价


铜基抗菌外加剂因其实用的杀菌能力而受到青睐，可用于减轻微生物引起的混凝土腐蚀（MICC）。然而，对有害成分的浸出性和这些混合物的长期功效的担忧阻碍了它们的工业应用，对其相对抗菌性能和机制的了解有限。在这项工作中，评估并比较了三种传统的铜化合物（硫酸铜、乙酸铜和氧化铜）和两种新合成的铜改性混合物（铜交换蒙脱土和铜螯合壳聚糖）对性能的影响。 、水泥净浆的耐生物腐蚀性和环境影响。研究结果表明，加入含铜外加剂可增加水泥浆的坍落度、延长凝结时间、提高抗压强度、降低孔隙率和减少腐蚀深度。与硫酸铜和氧化铜相比，醋酸铜表现出优异的工程性能、抗菌性能和减少铜离子浸出。铜改性蒙脱石成为最有效的铜基抗菌剂，可将水泥浆的腐蚀深度显着降低 32.8%，铜浸出量最低，表明其作为抗菌混凝土应用的可持续解决方案的潜力。相反，添加壳聚糖会导致机械性能差和抗菌性能不佳，表明其作为合成抗菌剂载体的潜力有限。