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Mixing, Placing and Curing Concrete
Concrete Placement Methods and Compaction
Description
Concrete placement methods focus on keeping the mix in a uniform shape and position. The concrete is placed as close as possible to its final location to reduce segregation, which is the separation of ingredients. It is then fully compacted to remove trapped air. The next layer is added while the layer below is still plastic...
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Transcript
混凝土应均匀地以水平层形式放置到接近其最终位置处。
浇筑后,混凝土层需充分压实以排出夹带的空气,并在仍处于塑性状态时在其上方浇筑下一层,从而形成整体结构。
对于水平或倾斜表面,应将混凝土垂直浇筑到现有层上。模板的浇筑速度应至少为每小时6英尺,以确保垂直表面具有均匀的饰面。
传统上,混凝土通过溜槽、手推车、管道或输送带进行浇筑。
特殊方法(如导管浇筑法)使用带有防水接头的光滑垂直管道,将和易性良好的混凝土浇筑到深模内或水下。
管道内的混凝土在逐渐提升过程中依靠重力流动,确保其末端始终浸没在混凝土中,防止水渗入。
另一种用于连续放置和压实低流动性混凝土的专用方法是滑模技术,该技术使用模板,可在已浇筑的混凝土...
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