Metakaolin-based alkali activated mortars (AAM) - with and without CuSO₄·5H₂O and ZnO addition (mass ratio Mⁿ⁺/solid binder 0.08% to 1.7%) - were casted and exposed within an extensive long-term field campaign over the period of 20 months to a sewer basin, strongly affected by biogenic acid corrosion. (Un-)exposed AAM were tested regarding their physicochemical and microstructural properties, bioreceptivity and overall durability. Metal addition led to a retarding effect during alkali-activation reaction, as well as to an increase in open porosity of up to 3.0% and corresponding lower compressive strength of up to 10.9%. Reduced microbial colonization and diversity were observed on AAM with Cu, while Zn addition led to increased biodiversity. We propose that the observed higher durability of Cu-doped AAM is due to antibacterial effects and associated reduction of biogenic acid production, superseding overall negative effects of metal-dosage on physical material properties. Observed lower durability of Zn-doped AAM was related to combined negative physicochemical and microbial effects.

偏高岭土碱活化砂浆 (AAM) - 添加和不添加 CuSO ₄ ·5H ₂ O 和 ZnO（质量比 M ⁿ⁺/固体粘合剂 0.08% 至 1.7%) - 在 20 个月的时间里，在广泛的长期田间活动中浇铸并暴露在下水道盆中，受到生物酸腐蚀的强烈影响。对（未）暴露的 AAM 的物理化学和微观结构特性、生物接受性和整体耐久性进行了测试。金属添加导致碱活化反应过程中的阻滞作用，以及增加高达 3.0% 的开孔率和高达 10.9% 的相应较低抗压强度。在含铜的 AAM 上观察到微生物定植和多样性减少，而添加锌导致生物多样性增加。我们提出，观察到的掺杂铜的 AAM 具有更高的耐久性是由于抗菌作用和相关的生物酸产量减少，取代金属剂量对物理材料特性的整体负面影响。观察到的 Zn 掺杂 AAM 的耐久性较低与不利的物理化学和微生物效应有关。