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与一般结构相比较,大体积混凝土坝工程施工中,由于水泥水化热引起混凝土内部浇筑温度和温度应力剧烈变化,从而导致混凝土发生裂缝,影响混凝土坝的浇筑质量,因此,应控制混凝土坝浇筑块体因水化热引起的温升,混凝土浇筑块体的内外温差及降温速度以防止混凝土坝出现有害的温度裂缝。1 大体积混凝土坝的温度应力分析1.1 根据温度应力的形成过程可分为以下3个阶段①早期:自浇筑混凝土开始至水泥放热基本结束,一般约30d。这个阶段的两个特征:一是水泥放出大量的水化热;二是
Compared with the general structure, the construction of large-volume concrete dam, due to cement hydration caused by pouring temperature and temperature inside the concrete drastic changes, resulting in cracks in concrete, affecting the quality of concrete dam pouring, it should be controlled concrete dam pouring Blocks due to heat caused by heat, concrete pouring block temperature difference between inside and outside the cooling rate and to prevent the concrete dam appears harmful temperature cracks. A large-volume concrete dam temperature stress analysis 1.1 According to the formation process of temperature stress can be divided into the following three stages ① early: from pouring concrete to the end of the basic end of the cement, usually about 30d. Two characteristics of this stage: First, cement released a lot of heat of hydration; two is