Sewage sludge ash (SSA) is an unavoidable waste during the treatment of wastewater, and because it contains a significant amount of heavy metals, it constitutes a major pollution risk. Therefore, different approaches are proposed worldwide for the safe and sustainable disposal of SSA. One such approach is the incorporation of SSA in the preparation of cementitious composites as cement replacement like other industrial waste materials (e.g., fly ash, silica fume, and slag). This article comparatively analyses the characteristics (chemical composition, pozzolanic activity, and particle morphology) of SSA and properties of SSA modified cementitious composites, including hydration kinetics, mechanical properties, drying shrinkage, porosity, and microstructural properties. The study concludes that SSA can replace cement in the production of greener cementitious composites by 5–10%, which can be further increased to 20% by using pre-treated SSA. However, a detailed experimental investigation is required to assess the full potential of SSA as a cement replacement material and to address some contradictory observations reported by different researchers related to the properties of cementitious composites incorporating SSA.

污水污泥灰（SSA）是废水处理过程中不可回避的废物，由于其含有大量重金属，构成重大污染风险。因此，世界范围内提出了不同的方法来安全和可持续地处置 SSA。一种这样的方法是在制备水泥复合材料中加入 SSA，作为水泥替代品，就像其他工业废料（例如，粉煤灰、硅灰和矿渣）一样。本文比较分析了SSA的特性（化学成分、火山灰活性和颗粒形态）和SSA改性水泥基复合材料的水化动力学、力学性能、干燥收缩、孔隙率和微观结构特性。研究得出结论，SSA 可以在生产更环保的水泥复合材料中替代水泥 5-10%，使用预处理的 SSA 可以进一步提高到 20%。然而，需要进行详细的实验研究来评估 SSA 作为水泥替代材料的全部潜力，并解决不同研究人员报告的与含有 SSA 的水泥复合材料性能相关的一些矛盾观察结果。