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首页> 外文会议>Structures congress >Research on the Shrinkage Deformation and Crack Development of High-Strength High-Performance Concrete Containing Silica Fume
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Research on the Shrinkage Deformation and Crack Development of High-Strength High-Performance Concrete Containing Silica Fume

机译：含硅粉高强度高性能混凝土的收缩变形及裂缝发展研究

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High-strength high-performance concrete containing silica fume may easily cause cracking atearly age. In this research, self designed edge restrained plate specimens of 600 mm × 600 mm ×100 mm in dimension were cast with silica fume concrete and embedded optic fiber sensor(SOFO) for tests, which include image analysis, crack development observation, andcontinuously detection of the shrinkage deformation of concrete at early age. Test resultsindicated that the shrinkage deformation of concrete at the age of 1-3 hours is 0.01 mm, equal toa strain of 20×10~(-6) (mm/mm) or a tensile stress of about 2.4 MPa, so the plastic cracking mayoccur within one hour. The shrinkage deformation of concrete at the age of 3-12 hours increasedto a strain of 278×10~(-6) (mm/mm), indicating a relatively great growing rate of crack development.After the age of 12 hours, the volume change tends to a stable situation that the shrinkage crackwill occur only when the shrinkage stress becomes greater than the corresponding tensilestrength of concrete.
机译：含有硅粉的高强度高性能混凝土可能会在开裂时引起开裂 早年。在这项研究中，我们自行设计了600 mm×600 mm× 用硅粉混凝土和嵌入式光纤传感器浇铸100毫米尺寸 （SOFO）进行测试，其中包括图像分析，裂纹发展观察和 连续检测早期的混凝土收缩变形。试验结果 表示1-3小时时混凝土的收缩变形为0.01 mm，等于 20×10〜（-6）（mm / mm）的应变或约2.4 MPa的拉应力，因此塑性开裂可能 一小时内发生。 3-12小时时混凝土的收缩变形增加 应变为278×10〜（-6）（mm / mm），表明裂纹扩展的增长率相对较高。 12小时龄后，体积变化趋于稳定，出现收缩裂纹 仅当收缩应力大于相应的拉伸应力时才会发生 混凝土的强度。

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