| abstract |
The invention discloses a liquid alkali-free setting accelerator and a preparation method thereof. The existing alkali-free accelerators contain a large amount of fluoride ions, have no strength in the early stage, low strength in the later stage, large dosage, long setting time, and strong corrosion to the steel skeleton, which hinders the construction of shotcrete. The present invention comprises 35-50 parts by weight of aluminum sulfate octadecahydrate, 3-7 parts by weight of stabilizer, 0.5-1.5 parts by weight of surfactant, 3-7 parts by weight of early strength agent, and the balance is water; The strong agent is dissolved in water; then aluminum sulfate octadecahydrate is added, and heated to dissolve; after the mixed solution is cooled, the surfactant and the remaining water are added, stirred and reacted, and cooled to room temperature to obtain a liquid alkali-free accelerator. The liquid quick-setting agent obtained by the invention is free of chlorine, alkali and fluorine, has no loss in the later strength of concrete, is less corrosive, does not pollute the environment, and does not affect the coagulation effect and shear strength of the quick-setting agent on concrete. |