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提高水泥护孔堵漏的关键,除重视水泥品种的选择,采用合理的灌入工艺外,还取决于正确掌握候凝时间和恰到好处的透孔期。往往由于未能控制好合适的扫孔时间,急于透孔,致使孔内水泥浆固化强度偏低,达不到扫孔时间而导致失败;或由于候凝时间过长,其结石强度过高,扫出斜孔。均不能达到护孔堵漏应有的效果。另外,不同品种的水泥都有不同的物理检验方法和技术条件。如水泥标号,是反映水泥强度级别的重要标志,它是采用0.44～0.46水灰比、以1:2.5胶砂比成型、试块浸入恒温水中养护、经过试
The key to improving the plugging of cement retaining holes is to rely on the selection of cement varieties and adopting a reasonable pouring process. It also depends on the correct control of the waiting time and the proper through-hole period. Often due to failure to control the proper sweeping time, eager to penetrate the hole, resulting in the hole cement slurry strength is low, can not reach the sweeping time and lead to failure; or because the waiting time is too long, the stone intensity is too high, Sweep out the slant hole. Can not achieve the effect of plugging holes should have. In addition, different types of cement have different physical testing methods and technical conditions. For example, the cement number is an important indicator reflecting the cement strength grade. It is based on a water-cement ratio of 0.44 to 0.46, a 1:2.5 cement-to-sand ratio ratio, and the test block is immersed in constant-temperature water for maintenance.