土木工程专业大体积混凝土裂缝控制毕业论文

土木工程专业大体积混凝土裂缝控制毕业论文

Last revised by LE LE in 2021

河北农业大学

现代科技学院本科毕业论文题目：大体积混凝土结构裂缝控制与研究学部：工程技术学部

学生姓名：王宗盛

专业：土木工程

班级学号：

指导教师姓名：刘京红王印

指导教师职称：教授副教授

2015 年 5月 20日

大体积混凝土结构裂缝控制研究

土木工程1001班李军辉

指导教师：刘京红王印

摘要：随着我国经济的发展，工程建设规模也越来越大型化、复杂化。这使得工业与民用建筑中的大体积混凝土温度裂缝问题日益突出并成为具有相当普遍性的问题。大体积混凝土温度裂缝问题十分复杂，它涉及到和工程结构相关的方方面面。对大体积混凝土基础的温度裂缝控制更是涉及到岩土、结构、建筑材料、施工、环境等多专业、多学科。大体积混凝土在硬化过程释放的水化热会产生较大的温度变化，由此产生的温度应力是导致混凝土出现裂缝的主要因素，从而影响结构的整体性、防水性和耐久性，并成为结构的隐患。因此，大体积混凝土在施工中必须考虑裂缝控制。总结分析了大体积混凝土温度裂缝产生的原因以及控制措施，根据具体情况把这些措施灵活应用于具体大体积的基础工程施工，在施工中对材料选择、配合比、外加剂、施工布置、浇筑工艺、养护等几个环节采取了严格的控制措施，并同时对基础典型位置的内外温度差进行了监测。针对基础工程所采取的温控措施和监测结果，为同类工程的施工提供了参考，也为进一步的理论研究提供了依据。

关键词：大体积混凝土；裂缝控制；水化热；温度应力

Research on Control to Cracks of Massive Concrete Structure

Abstract :With economic development of China, the scale of construction works is become more and more large and complicated. This makes the temperature cracks of massive concrete structure in industrial buildings become increasingly prominent with a universal problem. The problem of temperature cracks of Massive concrete is very complicated. It involves all aspects of the engineering structure. The control to massive concrete foundation temperature cracks is more related to rock, structure, building materials, construction, environmental, and other multi-disciplinary. The heat of hydration is released in the hardening process of massive concrete will cause a greater temperature changes. The resulting temperature stress is the main factors to cause concrete cracks, then it affect integrity, waterproof and durability of the structure, and it become a hidden danger of structure. Cracks control must be considered during the construction of massive concrete structure. The mechanism and control measures of temperature cracks of massive concrete foundation in this paper are analyzed. According to circumstances, these measures are applied in construction of the specific massive concrete foundation. Strict control measures are taken during the construction in the choice of materials, mix, additives, construction layout, pouring technology, conservation and other links, at the same

time, temperature difference between the internal and external of the foundation in the typical locations are monitored. The monitoring results show that the temperature differences are all reasonable, cracks are avoided. In addition, control measures of temperature cracks are taken that are reasonable and effective .The temperature control measures and monitoring results not only provides a convenient for the similar construction projects, but also provides reference data for further theoretical research.

Keywords: massive concrete; cracks control; hydration heat; temperature stress

目录

第 1 章绪论...........................................

课题的背景与实际意义..................................

大体积混凝土的定义...............................

大体积混凝土在工程上的应用.......................

国内外研究现状........................................

国内情况..........................................

国外情况..........................................

本文研究的内容和研究方法..............................

研究的内容........................................

研究的方法........................................

第 2 章大体积混凝土裂缝产生的原因分析及预测 ..............

裂缝的种类............................................

微观裂缝..........................................

宏观裂缝..........................................

大体积混凝土裂缝产生的原因分析........................