Granular activated carbon (GAC) particles impregnated with antimicrobial metals were incorporated into cementitious materials for the express purpose of inhibiting biogenic concrete corrosion. We report herein the influence of such metal-laden GAC particles on the hydration of cement mortars when substituted for fine aggregate, as well as the dispersion of metal in the cured matrix. Isothermal calorimetry was utilized to study the influence of GAC without and with copper and/or cobalt on select hydration characteristics of ordinary portland cement (OPC) mortars. When 1% of the fine aggregate mass was replaced with GAC particles of similar size, total evolved heat in all formulations was similar, regardless of GAC pretreatment. However, as the substitution approached 10% of the fine aggregate mass, metal-laden GAC formulations imparted delays in heat liberation and lowered heat fluxes. Results also substantiate that metal-laden GAC particles participate in the enhanced uptake of the calcium that is normally liberated during cement mixing and that the water delivered with GAC particles is not readily available during the first 142 h of curing. Electron microprobe analysis (EMPA) elucidated that copper and cobalt were homogenously distributed throughout the cement paste with metal-laden GAC, with these metals concentrations localized in a 50-100 μm region surrounding the GAC particles. Compressive strengths were not affected by the presence of metal-impregnated GAC in the concentration ranges tested and reported herein.

为了抑制生源混凝土腐蚀，将浸渍有抗菌金属的颗粒状活性炭（GAC）颗粒掺入胶凝材料中。我们在本文中报道了这种富含金属的GAC颗粒对水泥砂浆水合的影响（当替代细骨料时）以及金属在固化基质中的分散。等温量热法用于研究GAC在不添加和/或添加铜和/或钴的情况下对普通硅酸盐水泥（OPC）砂浆选择水合特性的影响。当将1％的细骨料质量替换为大小相似的GAC颗粒时，无论GAC预处理如何，所有配方中的总放热都相似。但是，随着替代量接近总细料质量的10％，含金属的GAC配方可延迟放热并降低热通量。结果还证实，负载金属的GAC颗粒参与了水泥混合过程中通常释放的钙的吸收增强，并且在固化的前142小时内，随GAC颗粒输送的水不易获得。电子探针分析（EMPA）阐明，在含金属的GAC中，铜和钴均匀地分布在整个水泥浆中，这些金属的浓度集中在GAC颗粒周围的50-100μm区域。在本文测试和报道的浓度范围内，金属浸渍的GAC的存在不影响抗压强度。结果还证实，负载金属的GAC颗粒参与了水泥混合过程中通常释放的钙的吸收增强，并且在固化的前142小时内，随GAC颗粒输送的水不易获得。电子微探针分析（EMPA）表明，在含金属的GAC中，铜和钴均匀分布在整个水泥浆中，这些金属的浓度集中在GAC颗粒周围的50-100μm区域。在本文测试和报道的浓度范围内，金属浸渍的GAC的存在不影响抗压强度。结果还证实，负载金属的GAC颗粒参与了水泥混合过程中通常释放的钙的吸收增强，并且在固化的前142小时内，随GAC颗粒输送的水不易获得。电子探针分析（EMPA）阐明，在含金属的GAC中，铜和钴均匀地分布在整个水泥浆中，这些金属的浓度集中在GAC颗粒周围的50-100μm区域。在本文测试和报道的浓度范围内，金属浸渍的GAC的存在不影响抗压强度。电子探针分析（EMPA）阐明，在含金属的GAC中，铜和钴均匀地分布在整个水泥浆中，这些金属的浓度集中在GAC颗粒周围的50-100μm区域。在本文测试和报道的浓度范围内，金属浸渍的GAC的存在不影响抗压强度。电子探针分析（EMPA）阐明，在含金属的GAC中，铜和钴均匀地分布在整个水泥浆中，这些金属的浓度集中在GAC颗粒周围的50-100μm区域。在本文测试和报道的浓度范围内，金属浸渍的GAC的存在不影响抗压强度。