Geopolymers are known as ecofriendly materials because of their low CO₂ emissions and waste materials that could be used in their fabrication. In this paper, pumice is used as a raw material obtained from volcanic ashes to produce a sustainable mortar. For this purpose, the effects of sodium oxide concentration (Na₂O%) and silica modulus (M_S) on the durability and mechanical properties of geopolymer mortars based on pumice as a natural pozzolan were investigated. Sodium oxide at the concentrations of 8, 10, and 12% by the mass of the binder and silica modulus of 1, 1.5, and 2 were used for preparing the mortars. The properties of the geopolymer mortar were investigated through compressive, flexural, and tensile strengths, water absorption, rapid chloride migration (RCM), and the length change of mortars exposed to a sulfate solution. Additionally, scanning electron microscopy (SEM) and X-ray diffraction analyses were performed on the specimens. The results showed that the optimum value for the compressive and flexural strengths was achieved at 10% and 1.5 for sodium oxide and silica modulus, respectively. As the Na₂O concentration and silica modulus increased, the porosity decreased, and a denser matrix formed, resulting in lower permeability. The microstructural analysis of the geopolymer specimens also described the higher durability of specimens with higher sodium oxide content and silica modulus. The results of the environmental impact of pumice-based geopolymer revealed that it had a lower CO₂ index than the reference specimen and could be a sustainable material for future uses.

地聚合物因其低CO ₂排放和可用于制造的废料而被称为环保材料。在本文中，将浮石用作从火山灰中获得的原料，以生产可持续的砂浆。为此，氧化钠浓度（Na ₂ O％）和二氧化硅模量（M _S）研究了以浮石为天然火山灰的地聚合物砂浆的耐久性和力学性能。使用浓度为粘合剂质量的8％，10％和12％的氧化钠和1、1.5和2的二氧化硅模量来制备砂浆。通过抗压强度，抗折强度和抗拉强度，吸水率，快速氯离子迁移（RCM）以及暴露于硫酸盐溶液的砂浆的长度变化，研究了地质聚合物砂浆的性能。此外，对样品进行了扫描电子显微镜（SEM）和X射线衍射分析。结果表明，对于氧化钠和二氧化硅模量，抗压强度和弯曲强度的最佳值分别达到10％和1.5。作为Na ₂O浓度和二氧化硅模量增加，孔隙率降低，并且形成更致密的基体，导致较低的渗透性。地质聚合物样品的微观结构分析还表明，具有较高的氧化钠含量和二氧化硅模量的样品具有较高的耐久性。浮石基地质聚合物对环境的影响结果表明，它的CO ₂指数低于参考样品，并且可能是未来使用的可持续材料。