The preparation of alkali-activated materials from red mud for building materials is a promising way to solve the environmental pollution caused by red mud. However, the low compressive strength of alkali-activated red mud-based materials is the biggest obstacle to this solution. In this paper, we illustrate that the compressive strength of alkali-activated red mud and blast furnace slag-based materials is strongly influenced by the modulus of sodium silicate, preparation sequence, and calcination pretreatment. Thus, the best sodium silicate modulus (1.0) and optimized preparation sequence that involved using a cooled sodium hydroxide solution mixed with the red mud-blast furnace slag mixture before exposure to the sodium Csilicate were adopted. Then the calcination pretreatment of the red mud, gypsum, and lime was adopted to improve the compressive strength, and the optimal calcination temperature was selected to be 700 °C. The increase in the compressive strength (up to 71.82 MPa) resulted from a large number of active particles, which were generated by the fracture of numerous Si–O bonds and Al–O bonds after the calcination pretreatment. The results support the extensive utilization of red mud in building materials to prevent environmental pollution.

用赤泥制备建筑材料用的碱活化材料是解决赤泥造成的环境污染的有前途的途径。但是，碱活化赤泥基材料的低抗压强度是该解决方案的最大障碍。在本文中，我们说明了碱活化赤泥和高炉矿渣基材料的抗压强度受硅酸钠模量，制备顺序和煅烧预处理的强烈影响。因此，采用了最佳的硅酸钠模量（1.0）和优化的制备顺序，其中包括在暴露于硅酸钠之前，先将冷却的氢氧化钠溶液与赤泥-高炉矿渣混合物混合。然后赤泥，石膏的煅烧预处理，采用石灰来提高抗压强度，最佳煅烧温度为700℃。抗压强度的增加（高达71.82 MPa）是由于大量的活性颗粒，这些活性颗粒是由煅烧预处理后许多Si-O键和Al-O键断裂而产生的。结果支持在建筑材料中广泛使用赤泥，以防止环境污染。