Abstract The utilization of recycled concrete as an adsorbent to sequester NO2 without additives or catalysts is an innovative, cost-effective, and sustainable approach to capture NO2 from targeted industrial facilities. This paper presents the mechanical and durability performance of ordinary portland cement (OPC) concrete containing NO2 sequestered recycled concrete aggregate (NRCA). NRCA was used as a partial replacement for natural fine aggregate at 20% and 40% rates by volume. The incorporation of NRCA in concrete resulted in increased compressive strength, decreased water-permeable porosity, and reduced chloride ion migration. Moreover, test mixtures comprising 40% NRCA showed a significant chloride binding capacity compared to control concrete mixtures. Furthermore, high replacement rates of NRCA noticeably enhanced the resistance to chloride-induced corrosion of steel in concrete or at least was on par with the performance of a commercially available calcium nitrite-based corrosion inhibitor.

中文翻译：

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NO2封存再生混凝土骨料（NRCA）对混凝土力学和耐久性能的影响

摘要 利用再生混凝土作为吸附剂在没有添加剂或催化剂的情况下封存 NO2 是一种创新、经济且可持续的方法，可以从目标工业设施中捕获 NO2。本文介绍了含有 NO2 螯合再生混凝土骨料 (NRCA) 的普通硅酸盐水泥 (OPC) 混凝土的机械和耐久性性能。NRCA 以 20% 和 40% 的体积比例被用作天然细骨料的部分替代品。在混凝土中加入 NRCA 可提高抗压强度、降低透水孔隙率并减少氯离子迁移。此外，与对照混凝土混合物相比，包含 40% NRCA 的测试混合物显示出显着的氯化物结合能力。此外，