水下灌注混凝土与普通灌注不同,因在水下不具备振捣条件,而靠混凝土自身压力产生流动进行密实,施工较普通混凝土困难。所以要求混凝土必须具有良好的和易性,即富有粘性,较大的流动性和一定的保水能力。做好混凝土配合比工作,通过试验合理选用水泥用量,用水量,砂率,骨料的最大粒径与级配,确保其具有较好的和易性和流动性。 Underwater concrete pouring and ordinary perfusion different because of the underwater vibration conditions do not have to rely on the pressure of concrete to produce dense flow of concrete construction than ordinary concrete. Therefore, concrete must have good workability, that is rich in viscosity, greater mobility and a certain degree of water retention capacity. Do a good job with the concrete mix, through the rational use of test cement dosage, water consumption, sand rate, the maximum aggregate size and grading, to ensure that it has good workability and mobility.