采用竖向构件后浇带减小混凝土收缩应力

Reducing the Effect of Concrete Shrinkage Using Post-pouring Strip on Vertical Components

工程中常用水平构件后浇带来控制混凝土早期收缩变形产生的不利影响,但当构件内钢筋贯穿伸缩后浇带时,其对混凝土收缩应力的控制效果大大降低。根据混凝土收缩变形对建筑结构影响的分析,本文提出采用竖向构件后浇带来控制混凝土收缩应力,并给出其实施细节。通过分析比较,及具体工程实例说明,竖向构件后浇带对建筑结构早期混凝土收缩应力的控制,具有更好的效果。

It is well known that the post-pouting strip on horizontal components is often used to reduce the effect of concrete shrinkage in early stage, but its efficiency is reduced apparently if the rebars continue across the strip. According to the analysis of concrete shrinkage acting on the building structure, the post-pouting strip on vertical components is proposed, and its details are also provided. The comparison analysis and the results of an actual project show that the post-pouting strip on vertical components is better on reducing the effect of concrete shrinkage in early stage comparing with the post-pouring strip on horizontal components.