论文部分内容阅读
三峡坝区气温骤降频繁,夏季高温持续时间长,对混凝土温控有特殊要求;在进行混凝土配合比设计和混凝土施工时,除满足混凝土标号及抗冻、抗渗、极限拉伸值等主要设计指标外,还应满足混凝土匀质性指标。为有效防止大坝上、下游面产生裂缝,在大坝上、下游面采用苯板及时跟进保温。为了确保大坝进水口段等异型断面混凝土的保温效果,采用了现场喷涂聚氨酯材料发泡保温。这些新型保温材料的效果相当好,经冬季的考验,多次检查混凝土表面均未发现裂缝。三峡大坝混凝土温控设计、施工工艺的实践表明,三峡工程坝工技术应用非常成功,工程质量、进度均得到有效控制,满足工程建设需要。
Three Gorges dam area temperature plunged frequently, the summer high temperature duration of concrete temperature control have special requirements; concrete mix design and concrete construction, in addition to meet the concrete label and antifreeze, impermeability, the ultimate tensile value and other major Design indicators, but also to meet the concrete homogeneity index. In order to effectively prevent the dam upstream and downstream cracks, in the dam, the downstream surface of the benzene board in time to follow up insulation. In order to ensure the dam inlet section and other shaped section of the concrete insulation effect, the use of on-site polyurethane foam material insulation. The effect of these new insulation materials is quite good. After the test in winter, no cracks were found on the concrete surfaces for many times. The design of concrete temperature control of the Three Gorges Dam and the practice of construction technology show that the application of dam technology to the Three Gorges Project has been very successful and the project quality and progress have been effectively controlled to meet the needs of construction.