可持续发展的理念要求混凝土具有高耐久性,抗渗性是混凝土耐久性的重要指标。为了提高混凝土的抗渗性能,国家规范特别规定了抗渗混凝土配合比的设计方法,同时市面上各种膨胀剂、抗渗剂也应运而生。保障混凝土抗渗性能从根本上来讲是要提高混凝土的密实度,那么,配制抗渗混凝土时是否必须要使用膨胀剂呢?本期特别策划我刊诚邀大家参与该问题的探讨。 The concept of sustainable development requires high durability of concrete, impermeability is an important indicator of concrete durability. In order to improve the impermeability of concrete, the national norms specifically stipulates the design method for the mix proportion of impermeable concrete, meanwhile, various kinds of expansive agents and impermeable agents also come into being. To protect the impermeability of concrete fundamentally speaking is to increase the density of concrete, then, the preparation of impermeable concrete is necessary to use expansive it? This special plan I invite you to participate in the discussion of the issue.