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题 目：浅析大体积混凝土裂缝

学习中心：广东XXX经济贸易学校奥鹏学习中心[27] 层 次： 专科起点本科 专 业： 土木工程 年 级： 2012年秋季 学 号： 12XX16303381 学 生： 黄XX 指导教师： 王云洋 完成日期： 2015年 3月 15日

浅析大体积混凝土裂缝

内容摘要

大体积混凝土开裂后，其性能与原状混凝土性能相差很大，尤其是对耐久性（渗透性）的影响更大，严重影响结构的安全和耐久性能。因此研究大体积混凝土裂缝具有重要的工程意义。

本文首先简要概述了研究的背景及国内外的研究现状，进而分析了大体积混凝土裂缝产生的三大主要原因：水泥水化热、收缩裂缝以及外界气温变化等。其次阐述了注意原材料的选择，采用合理的施工方法以及科学合理的养护措施等大体积混凝土裂缝的预防措施。再次针对已经出现大体积裂缝的处理，概述了表面修补法、填充法、结构补强法以及灌浆法等大体积混凝土裂缝的处理方法。最后本文具体分析了两个实际工程案例，分析工程的预防处理措施以及取得的效果。

关键词：大体积混凝土；裂缝；处理措施

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浅析大体积混凝土裂缝

目 录

内容摘要 ····························································································· 1 引 言 ······························································································· 1 1 大体积混凝土及其开裂机理分析 ·························································· 5

1.1 大体积混凝土概述 ····································································· 5 1.2 大体积混凝土开裂机理分析 ························································· 5

1.2.1 温度裂缝 ········································································· 5 1.2.2 收缩裂缝 ········································································· 6 1.2.3 结构裂缝 ········································································· 7

2 大体积混凝土裂缝控制 ······································································ 9

2.1 注意原材料的选择 ····································································· 9

2.1.1 选好原材料 ······································································ 9 2.1.2 加强结构设计 ··································································· 9 2.2 采用合理的施工方法 ·································································· 9

2.2.1 降低浇筑温度和水化热 ······················································· 9 2.2.2 降低内外温差 ································································· 10 2.2.3 强化混凝土全程养护 ························································ 10 2.2.4 改善约束条件的措施 ························································ 10 2.3 科学、合理的养护措施 ····························································· 11

2.3.1 采用综合措施， 控制混凝土初始温度 ································· 11 2.3.2 采用综合措施， 提高混凝土抗裂能力 ································· 11

3 大体积混凝土裂缝的处理方法 ··························································· 12

3.1 表面修补法 ············································································ 12

3.1.1 涂覆法 ·········································································· 12 3.1.2 增加整体面层 ································································· 12 3.1.3 压抹环氧胶泥 ································································· 12 3.2 填充法 ·················································································· 13 3.3 结构补强法 ············································································ 13

3.3.1 碳纤维片材加固法 ··························································· 13 3.3.2 外包钢加固法 ································································· 13 3.4 灌浆法 ·················································································· 14

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