混凝土高抗渗防裂

混凝土的抗裂与抗渗长期以来被割裂,对一般工程只要求抗裂,不要求抗渗.但工程实践揭示了两者之间实际上存在着不可分割的内在联系.混凝土早期失水总是先形成不可见孔隙缺陷然后才形成不可见裂缝,总是先造成抗渗性能的降低然后才造成混凝土的开裂.因此高抗渗是防裂的重要方法.工程实践表明,防裂必须抗渗,不抗渗则难以防裂,高抗渗防裂效果显著.实现高抗渗必须满足的三个基本条件,并通过试验与生产实践论证了现在的混凝土都可以实现高抗渗.对膨胀混凝土的抗裂作用提出了最新见解,认为其同样服从高抗渗防裂的规律.高抗渗防裂是提高混凝土耐久性的重要途径和基本方法.

High impermeability of concrete for preventing from cracking

The inseparable intrinsic relation between cracking and permeability exists in concrete.The invisible hole will form prior to the invisible cracking and it will give rise to impermeable property of concrete decreasing prior to its cracking as the water in it is evaporated at early age.For this reason,high impermeability of concrete is a means of great importance for preventing from cracking and manifests an obvious effect in practice.In this paper authors put forward three basic conditions for high impermeability and demonstrate that current concrete can be all of impermeability to water by the experiment and application.Expansive concrete follows same the law of anticracking by high impermeability to water.It is an important way and basic means to improve the durability of concrete.