▎ 摘　　要

NOVELTY - Injection type concrete accelerating agent comprises 7-10 pts. wt. activated sepiolite , 4-6 pts. polyethyleneimine , 10-20 pts. modified nano graphene oxide and 130-140 pts. water. The preparation of injection type concrete accelerating agent comprises taking activated sepiolite, polyethyleneimine and modified nano graphene oxide and water into the reaction kettle, continuously introducing carbon dioxide gas into the reaction kettle, after the pressure rises to 0.6-0.8 MPa, stopping introducing, allowing to stand, when the pressure in the reaction kettle is reduced to 0.3-0.5 MPa, starting the reaction kettle, vacuuming to normal pressure, discharging to obtain the spraying type concrete accelerating agent. USE - Used as an injection type concrete accelerating agent. ADVANTAGE - The spraying-type concrete accelerating agent has excellent post strength and durability.