Alkali activated geopolymer is an attractive solution to limit the adverse consequences of cement manufacturing. In this paper, an evaluation of environmental impacts of geopolymer containing fly ash and silica fume is conducted. Life cycle assessment is performed by benchmarking the environmental impacts of three geopolymer concrete mixes against the conventional cement concrete, namely: fly ash geopolymer (with hydroxide and silicate of sodium); fly ash–silica fume blend geopolymer (with hydroxide and silicate of sodium); and fly ash–silica fume blend geopolymer (with sodium hydroxide). Impact analysis is performed by using ReCiPe midpoint and endpoint methods in life cycle assessment software UMBERTO NXT using database of Ecoinvent 3.0. Sensitivity analysis is performed to determine the effect of transportation. One mix design for each concrete of equal water to binder ratio and 28-days compressive strength of more than 35 MPa is analyzed. Results of life cycle assessment indicate that alkaline activators and cement are the major sources of negative environmental impacts for geopolymer and cement concrete, respectively. Global warming potential of geopolymer concretes is lower than conventional cement concrete. Fly ash–silica fume geopolymer concrete activated without sodium silicate has lowest environmental impacts. Transportation of raw materials is found to increase the overall negative of all four concrete mixes. Cost reduction of 10.87% to 17.77% per unit volume is achieved with the use of fly ash – silica fume based geopolymer concrete. Sustainability in terms of cost and environmental benefits of geopolymer concrete can be further increased by using silica fume. It can be concluded that the use of fly ash – silica fume blended geopolymer in the construction industry has huge possibility to improve its sustainability. Furthermore, waste management can be effectively done by utilization of industrial by-products in concrete.

碱活化的地质聚合物是一种有吸引力的解决方案，可以限制水泥生产的不利后果。本文对含粉煤灰和硅粉的地聚合物的环境影响进行了评估。生命周期评估是通过将三种地质聚合物混凝土混合物与常规水泥混凝土对环境影响进行基准测试来进行的，即：粉煤灰地质聚合物（含氢氧化物和硅酸钠）；粉煤灰-硅粉掺混地质聚合物（含氢氧化物和钠的硅酸盐）；和粉煤灰-硅粉掺混地质聚合物（含氢氧化钠）。通过使用Ecoinvent 3.0数据库在生命周期评估软件UMBERTO NXT中使用ReCiPe中点和端点方法进行影响分析。进行敏感性分析以确定运输的影响。分析了水灰浆比相同且28天抗压强度超过35 MPa的每种混凝土的一种配合比设计。生命周期评估结果表明，碱性活化剂和水泥分别是地质聚合物和水泥混凝土对环境造成负面影响的主要来源。地聚合物的全球变暖潜力低于常规水泥混凝土。不含硅酸钠活化的粉煤灰-硅粉岩土聚合物对环境的影响最小。发现原材料的运输会增加所有四种混凝土混合物的总体负面影响。使用粉煤灰-硅粉基地质聚合物混凝土可将单位体积的成本降低10.87％至17.77％。通过使用硅粉，可进一步提高地质聚合物混凝土在成本和环境效益方面的可持续性。可以得出结论，在建筑业中使用粉煤灰-硅粉掺混的地聚合物具有极大的可能性来改善其可持续性。此外，可以通过利用混凝土中的工业副产品来有效地进行废物管理。