With the growth of civil construction materials to mitigate environmental impacts and meet technical demands, modular soil-cement bricks have emerged as an alternative construction material in Brazil due to economic, social, and environmental reasons. However, the composition of Portland cement still generates environmental impacts due to CO₂ emissions. Thus, this study aimed to produce modular bricks through alkali activation in real scale using a mixture of clay soil and sand, metakaolin (M) or blast furnace slag (BFS) as precursors, NaOH solution as a simple activator, or compound with hydrated lime. Thermal curing effects were analyzed. Water absorption, compressive strength, XRF, XRD, SEM and EDS analysis were performed, as well as Life Cycle Analysis (LCA). All bricks presented suitable water absorption values according to Brazilian standards. Groups with metakaolin and simple activator presented the lowest compressive strength since an incomplete geopolymerization was verified; however, when a compound activator was used, the compressive strength was highly increased. The BFS group presented the best overall performance under water absorption and compressive strength with mean values of 3.6 MPa and 13.4%, respectively. Microstructural analyses confirmed the development of microstructures such as Zeolite, Calcite and Hydrated Calcium Silicate from the alkali activation reactions. Alkali activated bricks presented at least 35% less CO₂ emissions compared to ceramic bricks in LCA. Modular bricks made with MK or BFS and compound activator met all the requirements for their use, showing that these mixtures can be an alternative for sustainable brick production, with the reuse of industrial waste instead of Portland cement incorporation.

随着土木建筑材料的增长以减轻环境影响并满足技术要求，由于经济、社会和环境原因，模块化水泥土砖已成为巴西的替代建筑材料。然而，波特兰水泥的成分仍然由于CO ₂排放而产生环境影响。因此，本研究旨在使用粘土和沙子的混合物、偏高岭土 (M) 或高炉矿渣 (BFS) 作为前体、NaOH 溶液作为简单的活化剂或与熟石灰的混合物，通过实际规模的碱活化生产模块化砖。分析了热固化效果。进行了吸水率、抗压强度、XRF、XRD、SEM 和 EDS 分析，以及生命周期分析（LCA）。根据巴西标准，所有砖均具有合适的吸水率值。由于验证了不完全地质聚合，含有偏高岭土和简单活化剂的组表现出最低的抗压强度；然而，当使用复合活化剂时，抗压强度大大增加。BFS组在吸水率和抗压强度方面表现出最好的综合性能，平均值分别为3.6 MPa和13.4%。微观结构分析证实了碱活化反应中形成了沸石、方解石和水合硅酸钙等微观结构。_{碱活性砖的 CO 2}含量至少减少 35%与 LCA 中的陶瓷砖相比的排放量。用 MK 或 BFS 和复合活化剂制成的模块砖满足其使用的所有要求，表明这些混合物可以成为可持续砖生产的替代品，通过再利用工业废物代替波特兰水泥。