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钢筋混凝土是钢筋和混凝土组成的复合体是一种具有无序排列的微小孔大量存在的结构材料。这些微小孔难免不会有一部分相连成为通道。另外混凝土在水化凝结或使用过程中因受温度变化、干缩、受力等影响也会生成无数不规则的裂缝。这些“通道和裂缝”中的游离水会在干湿交替作用下经常会产生被蒸发去又复来这是混凝土的特征之一也是“固疾”。
Reinforced concrete is a composite of steel and concrete is a structural material with a large number of tiny holes arranged in disorder. These tiny holes will inevitably not be connected as a part of the channel. In addition, the concrete will generate numerous and irregular cracks due to temperature changes, shrinkage and stress during the process of hydration condensation or use. The free water in these “channels and crevices” often evaporates and recovers under alternating wet and dry conditions. This is one of the characteristics of concrete that is also “solid”.