文昌桥工程大体积混凝土结构裂缝成因及控制研究

发布时间：2018-05-11 00:39

本文选题：大体积混凝土 + 温度裂缝　；参考：《青岛理工大学》2015年硕士论文

【摘要】：随着科学技术及社会生产力的快速发展,大体积混凝土在基础设施建设中的使用日益频繁。由于混凝土中水泥的水化反应产生大量水化热,且由于自身体积较大不易向外界环境散发,从而形成内外温差,使混凝土内部产生温度和收缩应力,导致大体积混凝土温度裂缝的产生,影响结构物的外观质量和使用寿命。本文研究的主要目的是在大体积混凝土施工过程中,防止或减少因水泥水化热引起的结构裂缝,掌握大体积混凝土温度变化和温度应力变化的规律性,有针对地提出控制裂缝的方案,有效地保证大体积混凝土现场施工的质量,增强结构物的外观质量和使用寿命。本文结合潍坊滨海经济开发区文昌桥工程2#墩柱承台大体积混凝土温度控制的工程实践,研究分析了大体积混凝土内部温度变化和应力变化的规律,以及工程中采用的温度控制措施的实际效果。通过对文昌桥大体积混凝土承台温控方案及现场检测数据分析,从混凝土的组成材料、配合比、施工工艺等几方面研究大体积混凝土的温度应力、裂缝成因和裂缝控制措施,以期此类项目有一定的指导借鉴作用,减少或避免大体积混凝土温度裂缝在工程中出现。
[Abstract]:With the rapid development of science and technology and social productivity, mass concrete is used more and more frequently in infrastructure construction. Because the hydration reaction of cement in concrete produces a large amount of hydration heat, and because of its large volume, it is not easy to emit to the outside environment, thus forming the internal and external temperature difference, resulting in temperature and shrinkage stress inside the concrete. The temperature crack of mass concrete is produced, which affects the appearance quality and service life of structure. The main purpose of this paper is to prevent or reduce the structural cracks caused by the hydration heat of cement during the construction of mass concrete, and to master the regularity of temperature change and temperature stress change of mass concrete. In order to ensure the quality of mass concrete construction and enhance the appearance quality and service life of the structure, the crack control scheme is put forward. Based on the engineering practice of temperature control of bulky concrete in pier column cap of Wenchang Bridge Project of Weifang Binhai Economic Development Zone, this paper studies and analyzes the variation of temperature and stress of mass concrete. And the actual effect of the temperature control measures used in the project. Based on the analysis of temperature control scheme and field test data of mass concrete cap of Wenchang Bridge, the temperature stress, crack origin and crack control measures of mass concrete are studied from the aspects of concrete composition material, mix ratio, construction technology and so on. It is expected that this kind of project can be used for reference to reduce or avoid the temperature cracks of mass concrete in engineering.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.57

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