Novel environment-friendly liquid alkali-free cement accelerator

The invention belongs to the field of building materials, and particularly relates to a novel environment-friendly liquid alkali-free cement accelerator which comprises basic raw materials and additives; the basic raw materials comprise aluminum sulfate, magnesium sulfate, an early strength agent, a stabilizer, a regulator and water; and the additive is modified fumed silica. According to the cement accelerator, an existing formula is improved, and the additive modified fumed silica is added, so that the setting time of a cementing material is shortened, the compressive strength is improved, the rebound rate is low, the cementing material is free of alkali, fluorine and chlorine, adverse effects on a human body and the environment are avoided, and all technical requirements in the existing railway standard Q/CR807-2020 are met. 本发明属于建筑材料领域，具体涉及一种新型环保液体无碱水泥速凝剂，所述水泥速凝剂包括基础原料和添加剂，基础原料包括：硫酸铝、硫酸镁、早强剂、稳定剂、调节剂、水；添加剂：改性气相二氧化硅。该水泥速凝剂对现有配方进行改进，通过增加添加剂改性气相二氧化硅，能够实现胶凝材料的凝结时间缩短，抗压强度提升、回弹率小、无碱无氟无氯，不会对人体和环境产生不利影响，符合现行铁路标准Q/