高强自密实混凝土制备技术及工程应用

发布时间：2018-02-07 09:51

本文关键词： 高强自密实混凝土配合比设计工作性强度施工工艺　出处：《燕山大学》2014年硕士论文　论文类型：学位论文

【摘要】：深圳京基金融中心广场是市重点工程，作为京基金融中心广场核心的蔡屋围金融中心更是将高达439米，为确保其施工进度及质量，本工程在塔楼核心筒及外框柱使用了高强自密实混凝土，，施工顺序依次为-5层至46层使用C80自密实混凝土，47层至61层使用C70自密实混凝土，62层至73层使用了C60自密实混凝土。秉承因地制宜，就地取材的原则，对配制高强自密实混凝土的原材料进行了优选。并在此基础上，针对其低离析性和大流动性的技术难点，本工程采用了三掺粉煤灰、矿粉和聚羧酸外加剂的技术措施来进行高强自密实混凝土的配制。首先，对高强自密实混凝土的配合比进行了理论计算，得出了C60、C70、C80自密实混凝土的理论配合比；然后，经过实验室实验分析，研究了所配制混凝土的流动性、抗离析性、填充性等，在满足初始配制要求的情况下，最终成功配制出C60、C80自密实混凝土，确定了其最优配比。同时还研究了原材料的变动对高强自密实混凝土性能的影响，为施工中的原材料称量精度提供可靠的依据。根据以上确定的配比，在施工现场成功配制出高强自密实混凝土，并将其成功泵送，应用于深圳京基金融中心广场，经过严格的施工养护措施，获得了令人满意的施工质量，其经济、社会效益显著。
[Abstract]:Shenzhen Jingji Financial Center Square is a key project in the city. As the core of Jingji Financial Center Square, Cai Wuwei Financial Center will be as high as 439 meters. In order to ensure its construction progress and quality, In this project, high-strength self-compacting concrete is used in the core tube and outer frame column of the tower. The sequence of construction is -5 to 46 layers, C80 self-compacting concrete is used in 47 to 61 stories, C70 self-compacting concrete is used in 62 to 73 storeys, and C60 self-compacting concrete is used in the construction sequence. According to the principle of adapting measures to local conditions and selecting materials locally, the raw materials for the preparation of high strength self-compacting concrete have been selected. On this basis, in view of the technical difficulties of low segregation and high fluidity, the project has adopted three kinds of fly ash. The technical measures of mineral powder and polycarboxylic acid admixture are used to prepare high-strength self-compacting concrete. Firstly, the theoretical mix ratio of high-strength self-compacting concrete is calculated, and the theoretical mix ratio of C60C _ (70) C _ (70) C _ (80) self-compacting concrete is obtained. Through laboratory experiments and analysis, the fluidity, segregation resistance and filling property of concrete were studied. Finally, C60 C80 self-compacting concrete was prepared successfully under the condition that the initial preparation requirement was met. At the same time, the influence of the change of raw materials on the performance of high strength self-compacting concrete is studied, which provides a reliable basis for the weighing accuracy of raw materials in construction. According to the ratio determined above, the high strength self-compacting concrete is successfully prepared in the construction site, and successfully pumped, and applied to Shenzhen Jingji Financial Center Square. After strict construction maintenance measures, satisfactory construction quality is obtained. Its economy, social benefit is remarkable.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528;TU755

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