Evaluation of foam inducing and foam stabilizing properties of different kinds of concrete air entraining agents

Water solution method, saturated calcium hydroxide solution method and cement solution method were used to evaluate the foam inducing and foam stabilizing properties of seven different types of air entraining agents. The evaluation results of the three methods were compared with the initial air content of concrete, the air content in 1h and the change rate of air content in 1h. The results show that the corresponding relationship between the test results of water solution method and concrete is the best.