During the early hardening of concr

在混凝土的早期硬化过程中，水泥释放出大量的水化热，内部温度升高，并在混凝土表面形成拉伸应力。在随后的冷却过程中，由于其他混凝土组件的限制，混凝土中会出现拉应力。同时，温度（或混凝土表面的温度）在混凝土表面产生更大的拉伸应力。当这些拉伸应力超过混凝土的抗裂性时，将出现裂缝。大多数混凝土的内部湿度变化很小，但是表面湿度变化很大并且变化很大。这主要是由于维护不当，干湿交替造成的，并且表面的收缩和变形受到混凝土内部的限制，

在混凝土早期硬化过程中，水泥释放出大量的水化热量，内部温度升高，混凝土表面形成拉伸应力。在以后的冷却过程中，由于其他混凝土部件的制约，混凝土中会出现拉伸应力。同时，温度（或混凝土表面的温度）在混凝土表面产生更大的拉伸应力。当这些拉伸应力超过混凝土的抗裂纹阻力时，会出现裂纹。大多数混凝土的内部湿度变化很小，但表面湿度变化很大，变化很大。这主要是由于维护不当，交替干湿，表面收缩和变形受到混凝土内部的限制，导致表面混凝土被拉扯，造成表面裂缝

During the early hardening of concrete, the cement releases a large amount of heat of hydration, the internal temperature rises, and tensile stress is formed on the surface of the concrete. In the later cooling process, due to the constraints of other concrete components, tensile stress will appear in the concrete. At the same time, the temperature (or the temperature of the concrete surface) produces a greater tensile stress on the concrete surface. When these tensile stresses exceed the crack resistance of concrete, cracks will appear. The internal humidity of most concrete changes very little, but the surface humidity changes greatly and changes greatly. This is mainly due to improper maintenance, alternating dry and wet, and the surface shrinkage and deformation are restricted by the interior of the concrete, which causes the surface concrete to be pulled, causing surface cracks<br>