水工混凝土由于结构上的需要,常常是大块浇筑。众所周知,水泥在硬化时,会产生大量的水化热量。在最初一周内产生的热量几乎占总热量的80％,10天内可以达到总热量的90％。这些热量使混凝土温度显著上升,一般要比浇筑时高出15～30℃,以后又逐渐散发热量,温度随之降低。在这一过程中由于受到基础或相邻混凝土的约束而出现了拉应力。若此拉应力超过混凝土的抗裂能力,就要产生温度裂缝,有表面的、深层的和贯穿性的。这些裂缝程度不同的影响工 Hydraulic concrete due to structural needs, often large pouring. As we all know, cement hardens, it will produce a lot of hydration calories. The heat generated in the first week accounts for almost 80% of the total heat and can reach 90% of the total heat in 10 days. These heat make the concrete temperature rise significantly, generally higher than the pouring of 15 ~ 30 ℃, then gradually emit heat, the temperature decreases. Tensile stresses occur in this process due to being restrained by the foundation or adjacent concrete. If the tensile stress exceeds the cracking resistance of concrete, it is necessary to produce temperature cracks, surface, deep and penetrating. The impact of these different degrees of crack workers