地下室混凝土墙体施工期间开裂的温度影响分析与试验研究

Analysis and Experimental Study of Temperature Influence on the Basement Concrete Wall Crack During Construction

地下室混凝土墙体在施工期间经常由于多种原因而开裂,温度作用是其中重要的影响因素。温度对地下室混凝土墙体开裂的影响主要有4个方面水化热导致的内外过大温差;后期均匀降温;墙体较长时间高温导致的混凝土干燥收缩的早期发展;厚基础底板保温养护带来的影响等。尤其应注意,墙体自身以及基础底板较长时间的较高温度对墙体施工期间裂缝防治的不利影响。

Basement concrete wall may crack frequently during the construction as a result of many kinds of reasons. The temperature has a great influence on the concrete crack. The main influence includes： the oversized temperature difference between inside and outside due to hydration heat, the drop of temperature at late stage of the long time high temperature of the wall, the early development of concrete drying shrinkage because the temperature keeping during the thick foundation plate curing. It is suggested strongly to take precautions against oversized temperature of the wall and the thick foundation.