Composite additive adapted to Guangdong coastal deep soft soil rapid pile-forming cement mixing pile

The invention discloses a composite additive adapted to a Guangdong coastal deep soft soil rapid pile-forming cement mixing pile. Corresponding to the mass ratio of cement in the cement mixing pile, the composite additive is prepared from, by weight, 2%-3% of silicon dioxide, 0.03%-0.05% of triethanolamine, 4%-6% of water glass, 0.25%-0.4% of sodium hydroxide, 1.5%-2% of FDN and 0.5%-1% of calcium chloride. By adopting the composite additive prepared through the formula, in the same age, the compressive strength of cement soil doped with the composite additive is improved by 30% or above relative to the additive-free cement soil strength, at the same strength, the age of the cement soil doped with the composite additive is shortened by 20% or above relative to the additive-free cement soil strength, the strength of a pile body is effectively improved, and meanwhile the pile-forming speed is increased. 本发明公开种适应于广东省沿海深厚软土快速成桩水泥搅拌桩复合添加剂，相对应水泥搅拌桩中水泥的质量比，复合添加剂以重量百分比计，包括的原料成分有：二氧化硅2%～3%、三乙醇胺0.03%～0.05%、水玻璃4%～6.5%、氢