冬期混凝土施工技术.doc

水 利 水 电 新 技 术 姓 名：杜喜龙 学 号 指导老师：孙新建 日 期：2014年5月7日 水利工程冬期混凝土施工技术 摘要：混凝土是土木、水利工程中最重要的建筑材料，水利工程是我国基础设施建设的重要组成部分，工其程规模大、成本耗费高、质量要求严格，如果发生事故会造成严重后果，所以为了保证水利工程能够具备度汛条件或在灌溉期前投入使用，冬期施工往往不可避免。纵所周知，我国东北三省以及西北大部分地区有长达半年左右的冬季工期，特别是西藏地区，使水利工程建设进度大打折扣。冬季低温的交替出现使混凝土在饱水状态下因冻融循环产生破坏，导致混凝土内部结构发生相应变化，极大的影响到混凝土的强度和耐久性。因此在水利工程的冬期施工中，如何提高混凝土的抗冻性是施工的重点和难点，也是维持混凝土高强度和高性能的关键。本文针对水利工程冬期混凝土施工遇到的问题，提出混凝土冬季施工原理和保温措施，为解决冬期混凝土抗冻问题提出理论依据。 关键词：冬期；混凝土；施工技术；抗冻；保温措施 Abstract: the concrete is the most important civil engineering, hydraulic engineering construction materials, water conservancy project is an important part of Chinas infrastructure construction, industry and its process of big scale, high cost, strict quality requirements, if the accident can cause serious consequences, so in order to ensure the water conservancy project can have flood conditions or put into use in irrigation before the winter construction period, often inevitable. Known, the three northeast provinces of China and most of the Northwest for about half the winter period, the construction of water conservancy project at. The alternation of low temperature in winter, make concrete in water saturated state for freeze-thaw damage, leading to corresponding changes in the internal structure of concrete, the strength and durability of concrete greatly affects the. So in winter construction of water conservancy projects, how to improve the frost resistance of concrete is the key and difficult construction, is the key to maintaining high strength and high performance concrete. In this paper, some winter concrete construction of hydraulic engineering problems, put forward the construction principle of concrete in winter and heat preservation measures, as the theoretica