The invention provides a sasanqua
saponin concrete air entraining agent and a preparation method thereof. The air entraining agent is characterized by containing sasanqua
saponin therein. The preparation method is characterized by extracting sasanqua as a
raw material at normal temperature by hydrophilic
solvent water solution, and filtering; removing large-molecule impurities from the filtrate by membrane separation under pressure, removing small-molecule impurities by membrane separation, concentrating to be concentrate with Baume degree of not lower than 10Be (60 DEG C), and spray-
drying to form
solid formulation; or adding a modifying agent to prepare the air entraining agent in liquid formulation. The idea is novel, the raw materials are abundant, the production efficiency is high, the
energy consumption in the production is low, the production cost is low, the preparation method is simple in process, green and environment-friendly and is convenient to implement; when the air entraining agent is used in concrete
engineering, the dosage of the air entraining agent is low, the air
production rate is high, the aperture of the entrained air bubbles is small and the distance among the entrained air bubbles is small, and the air holes of the concrete are more even, more compact and non-communicated, therefore, the sasanqua
saponin concrete air entraining agent is valuable for popularizing.