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在混凝土真空脱水过程中,因真空负压产生的压差作用,混凝土产生体积收缩,形成更为致密的结构,其物理力学性能也得到相应改善。利用这一特点,在保证混凝土性能满足使用要求的情况下,可达到节约水泥的目的。1.利用真空混凝土的力学性能混凝土经真空处理,水灰比可降低15%～20%。真空处理一结束,混凝土即具有0.2MPa 左右的抗压强度,相当于不经真空处理的普通混凝土静停3小时以上的强度值。1天、7天和28天的抗压强度分别比普
In the process of vacuum dehydration of concrete, due to the pressure difference caused by vacuum negative pressure, the concrete produces volumetric shrinkage, forming a more compact structure, and its physical and mechanical properties have also been improved accordingly. Using this feature, the purpose of saving cement can be achieved while ensuring that the concrete performance meets the requirements of use. 1.Using the mechanical properties of vacuum concrete After vacuum treatment, the water-cement ratio can be reduced by 15% to 20%. At the end of the vacuum treatment, the concrete has a compressive strength of about 0.2 MPa, which corresponds to the strength value of the ordinary concrete that has not been vacuum-treated for more than 3 hours. The compressive strengths of 1 day, 7 days and 28 days were lower than those of