1.To improve the impermeability of concrete, and reduce cracks in concrete created by the shrinkage, expansive agent is often added.
为了提高混凝土的抗渗性能，以及减免由于混凝土收缩而产生的裂缝，在混凝土中经常加入膨胀剂。
2.The detecting results show that concrete has no cracks and has excellent impermeability .
现场检测表明，混凝土未出现裂纹，且抗渗性良好，达到了预期效果。
3.Author has found the newest theory of high impermeability of concrete for preventing from cracking on the basis of it.
混凝土高抗渗防裂最新抗裂理念的建立，利用了这一关系。
4.On the base of test analyse about its physical and mechanical properties, developing material study of impermeability and cast technics.
在对混凝土试样的物理力学性能测试分析的基础上，开展材料抗渗性能和浇筑工艺研究。
5.The material itself is water-repellent nano-crystalline material, they are able to moisture impermeability.
结晶纳米物质本身为憎水物质，所以能抗渗防潮。
6.When strengthening recycled aggregate, the impermeability of recycled aggregate concrete will be improved in a certain degree.
对再生骨料进行强化处理后，得到一定程度的改善；
7.Mainly, this paper mainly study and analyze the impermeability and electric conduction of the carbon fiber concrete (CFRC).
本文主要针对碳纤维混凝土（CFRC）的抗渗性能和导电性能进行了实验研究和分析。
8.The resistance of concrete to freezing and thawing can be improved by increasing its impermeability.
混凝土的抗冻性，可以用增强其抗渗性来提高。
9.The air entrained concrete has the advantage of high impermeability and frost resistance.
引气混凝土（加入引气剂的混凝土）较一般混凝土在保证强度下，具有抗渗及抗冻性高的优点。
10.TESTS RELATING TO PAVEMENTS. MEASUREMENT OF THE IMPERMEABILITY OF JOINTS ON CEMENT CONCRETE PAVEMENTS.
路面试验.水泥混凝土路面上的接合处的不透水性试验