Admixture of air-entraining agent i

Admixture of air-entraining agent is the main measure to improve the frost resistance of concrete. Under the condition that the mixing ratio of concrete remains unchanged, the air bubbles generated after the addition of air-entraining agent will correspondingly increase the volume of cement slurry, buffer the water pressure generated by the freezing of water inside concrete, and improve the frost resistance of concrete. It has been proved by practice that the concrete mixed with air-entraining agent has surface spalling and other frost damage phenomenon 10 to 15 years later than the concrete without air-entraining agent.