The present study investigated the use of sludge ash from water treatment plants as supplementary cementing material, elaborating hydraulic mortars with different levels of cement replacement by sludge ash (10 wt% and 30 wt%) and different temperatures of calcination (600 °C and 800 °C). Characterization of sludge ash and mortars includes XRF, XRD, particle size distribution by laser diffraction, compressive strength, and SEM-EDS. The results show that SiO₂, Al₂O_3, and Fe₂O₃ compose 90 % of the sludge ash, and it has potential pozzolanic activity. It is evidenced that there is a significant influence of the variable ratio of sludge ash:cement in the compressive strength of the mortar cubes over other variables. Overall, this study showed that the sludge ash could be considered as a viable and sustainable alternative for the construction sector. Despite the benefits of the suggested replacement, the presence of amorphous SiO₂ requires a review of long-time chemical behavior.

本研究调查了水处理厂的污泥灰作为补充胶凝材料的用途，用不同的煅烧温度（600°C和800℃）制作了不同灰泥替代水平的水泥灰浆，这些水灰泥由污泥灰（10 wt％和30 wt％）替代。 °C）。污泥灰浆和灰浆的表征包括XRF，XRD，通过激光衍射的粒度分布，抗压强度和SEM-EDS。结果表明，SiO ₂，Al ₂ O ₃和Fe ₂ O ₃占污泥灰分的90％，并且具有潜在的火山灰活性。有证据表明，污泥灰浆：水泥的可变比率对砂浆立方体的抗压强度的影响远大于其他变量。总体而言，这项研究表明，污泥灰可以被认为是建筑行业可行和可持续的替代方案。尽管建议的替代方法有很多好处，但无定形SiO ₂的存在仍需要对长期化学行为进行评估。