Alkali-activated binders have been considered a low carbon alternative to cement and are produced by reacting aluminosilicate precursor with an alkali-activator. However, alkali-activators have been observed to be a major contributor to the environmental burdens of alkali-activated materials regarding various environmental impact categories. Therefore, this study aims to perform an environmental impact assessment using life cycle assessment methodology on alkali-activated mortars produced from chemically modified one- and two-part waste-derived activators (waste glass and rice husk ash) in comparison to conventional one- and two-part alkali-activated mortars, to estimate the influence of activator on environmental impact of mortar. Additionally, a simplified cost analysis of the different mortar compositions was conducted. A sensitivity analysis was performed on the key parameters, and allocating emissions to waste glass and rice husk ash. Results show that waste glass and rice husk ash-derived alkali-activated mortar resulted in up to 62%, 61%, 76% and 56% reduced emission respectively in climate change, fossil depletion, terrestrial acidification and photochemical ozone creation formation when compared to conventional alkali-activated mortar counterpart. Sensitivity analysis indicated that waste glass and rice husk ash are not so sensitive to mass allocation, with a maximum of 5% increased emissions observed in the above-mentioned impact categories. Additionally, sensitivity analysis on sodium hydroxide demonstrated that production from chlorine-alkali electrolysis using technology-mix produced improved environmental performance in comparison to production from brine solution and diaphragm route, respectively. Sensitivity analysis on sodium silicate using an alternative inventory data indicated the emissions can increase regarding one-part or decrease regarding two-part alkali-activated mortars. Results from cost analysis indicated up to 19% cost savings from waste-derived alkali-activated mortar compared to conventional alkali-activated mortar. In conclusion, chemically modified waste-derived activators are a promising alternative in improving environmental performance of alkali-activated materials if their usage also reduces or substitutes the need for conventional alkali-activators.

碱活化的粘合剂被认为是水泥的低碳替代品，并且是通过使铝硅酸盐前体与碱活化剂反应生产的。然而，已经观察到碱活化剂是关于各种环境影响类别的碱活化材料的环境负担的主要贡献者。因此，本研究旨在使用生命周期评估方法，对由化学改性的一和两部分废物衍生活化剂（废玻璃和稻壳灰）与传统的一和二废料生产的碱活化砂浆进行环境影响评估。两部分的碱活化砂浆，以评估活化剂对砂浆环境影响的影响。另外，对不同灰浆组成进行了简化的成本分析。对关键参数进行了敏感性分析，并将排放物分配给了废玻璃和稻壳灰。结果表明，与之相比，废玻璃和稻壳灰衍生的碱活化砂浆与气候变化，化石耗竭，陆地酸化和光化学臭氧生成形成相比，分别减少多达62％，61％，76％和56％的排放。常规的碱活化砂浆的对应物。敏感性分析表明，废玻璃和稻壳灰对质量分配不太敏感，在上述影响类别中观察到的排放量最多增加了5％。另外，对氢氧化钠的敏感性分析表明，与分别从盐水溶液和隔膜法生产的产品相比，使用技术混合物从氯碱电解生产的产品改善了环境性能。使用替代清单数据对硅酸钠进行的敏感性分析表明，排放量可能会增加（对于一部分）或减少（对于两部分）碱活化砂浆。成本分析结果表明，与传统的碱活化砂浆相比，废渣碱活化砂浆可节省多达19％的成本。总之，如果化学改性的废物衍生活化剂的使用也减少或替代了传统的碱活化剂，则它们是改善碱活化材料的环境性能的有前途的替代品。