浅谈混凝土施工裂缝论文.docVIP

郑州交通职业学院 毕 业 论 文（设 计） 论文（设计）题目： 浅谈混凝土施工裂缝 所属系别 交通工程系 专业班级 工程造价1班 姓　　名 宋涛 学　　号200908040460142 指导教师 程晓波 撰写日期 2011 年 10 月 摘 要 　 混凝土是指用水泥作胶凝材料，砂、石作集料，与水(另包括外加剂和掺合料)按一定比例配合，经搅拌、成型、养护而得的工程复合材料。因其取材广泛、价格低廉、抗压强度高、可浇筑成各种形状，并且耐火性好、不易风化、养护费用低，成为当今世界建筑结构中使用最广泛的建筑材料。但是混凝土抗拉能力差、脆性大、容易开裂。大量的工程实践和理论分析表明，几乎所有的混凝土构件均是带裂缝工作的，只是有些裂缝很细，甚至肉眼看不见（＜0.05mm），一般对结构的使用无大的危害，可允许其存在；但是这些裂缝在使用荷载或外界物理、化学因素的作用下，不断产生和扩展，引起混凝土碳化、保护层剥落、钢筋腐蚀，使混凝土的强度和刚度受到削弱，耐久性降低，严重时甚至发生垮塌事故，危害结构的正常使用，必须加以控制。 关键词：混凝土 ，施工裂缝，微裂缝，变形，收缩，原因，预防 Abstract Concrete is a kind of cement as the cementing material, sand, stone as aggregate, and water ( including other admixtures and additives ) according to a certain proportion, stirring, forming, maintenance and engineering of composite materials. Because of its extensive raw material, low price, high compressive strength, it can be poured into various shapes, and good fire-resistant and difficult to weathering, low maintenance costs, as a structure in the world today the most widely used building materials. But the concrete tensile capacity of poor, brittleness, easy to crack. A large number of engineering practice and theoretical analysis show that, almost all of the concrete members are working with the cracks, but some crack is very fine, even invisible ( 0.05mm), general the use of the structure of no great harm, can be allowed to exist; but these cracks in the use of loading or physical, chemical factors the role, continue to produce and expansion, causing concrete carbonation, protective layer, corrosion of reinforcement, the strength and stiffness of concrete subjected to weaken, reducing the durability, even a serious collapse accidents, affecting the normal use, must be controlled. Key Word: Concrete, cracks, crack, deformation, shrinkage, reason, prevention Remedial measures 目 录 1 引言 4 2 混凝土施工裂缝的危害 4 3 混凝土施工裂缝产生的原因 4 3.1 温度变化引起的裂缝 5 3.2收缩变化引起的裂缝 5 3.3钢筋锈蚀引起的裂缝 5 3.4冻胀引起的裂缝 5 3.5沉陷不均匀引起的裂缝 6 4混凝土施工裂缝的预防 6 4.1设计方面的主要控制措施 6 4.2混凝土材料及配合比方面的主要控