在内部或周围盛水或隔水的结构物,如水箱、水库、水管、基础和钢筋混凝土船舶中的混凝土要做成防水的。在某些场合,作为结构本身防止剥落的手段,或混凝土防护层不足处作为对钢筋的附加保护层,均要求混凝土是防水的。 用适当的配合比设计,新建筑的混凝土可 The concrete in water-filled or watertight structures such as tanks, reservoirs, pipes, foundations and reinforced concrete vessels is to be waterproof. In some cases, the concrete is water-repellent as a means of preventing the flaking of the structure itself or as an additional layer of protection for the reinforcement due to inadequate protection of the concrete. With the appropriate mix design, the concrete of the new building may be