Composite additive, jet-reinforced mortar and preparation method of jet-reinforced mortar

The invention relates to the technical field of engineering materials, in particular to a composite additive, jet-reinforced mortar and a preparation method of the jet-reinforced mortar. Comprising the following components in parts by mass: 3-10 parts of vinyl acetate, 10-20 parts of diatomite, 10-20 parts of a calcium oxide expanding agent, 0.5-1 part of a shrinkage reducing agent, 1-2 parts of a water reducing agent, 1-2 parts of polypropylene fibers, 0.1-0.4 part of a retarder, 0.01-0.10 part of an air entraining agent and 0.1-0.4 part of a thixotropic agent. 本发明涉及工程材料技术领域，具体而言，涉及一种复合添加剂、喷射加固砂浆及其制备方法。包括按照质量份数计的以下组分：乙酸乙烯酯3-10份，硅藻土10-20份，氧化钙膨胀剂10-20份，减缩剂0.5-1份，减水剂1-2份，聚丙烯纤维1-2份、缓凝剂0.1-0.4份、引气剂0.01-0.10份和触变剂0.1-0.4份。