混凝土的抗渗性能常以混凝土抵抗压力水渗透的能力来衡量,工程上常用“抗渗标号”来评价。目前,我国的标准试验方法是采用直径150毫米、高150毫米的圆柱体或底面直径185毫米、顶面直径175毫米、高150毫米的截圆锥体试件六块,在渗透仪上每隔8小时增加水压力1公斤/厘米~2(开始试验时水压为1公斤/厘米~2),混凝土抗渗标号(B)按六个试件中四个试件未发现有透水 The impermeability of concrete is often measured by the ability of concrete to resist the penetration of pressure water, and the “impermeability index” is commonly used in engineering. At present, China’s standard test method is to use a cylinder with a diameter of 150 mm and a height of 150 mm, or six specimens with a bottom diameter of 185 mm, a top surface of 175 mm and a height of 150 mm, and every 8 in the permeameter. 1 hour increase in water pressure 1 kg/cm~2 (water pressure at the beginning of the test is 1 kg/cm~2), and concrete impermeability mark (B) is not found in four specimens of six test specimens.