扩大基础混凝土温度裂缝成因分析与控制

Analysis and control of expanding temperature cracks in foundation concrete

扩大基础混凝土用量大,施工过程中由于水泥水化反应等会产生大量热量,造成混凝土温度升高,如温差过大容易产生温度裂缝。为了有效控制扩大基础混凝土温度裂缝,阐述了混凝土水化热升温原理,分析了混凝土温度裂缝的产生原因。并在扩大基础施工过程中布置测点,对混凝土上部、中部和下部温度进行监测,绘制温度—时间曲线进行分析,进一步验证当温差小于25℃时可有效减少混凝土温缩裂缝,提高基础混凝土施工质量。

The amount of concrete used for expanding the foundation is large.During the construction process,a large amount of heat will be generated due to the cement hydration reaction,which will cause the temperature of the concrete to rise.If the temperature difference is too large,it is easy to produce temperature cracks.In order to effectively control and expand the temperature cracks of the foundation concrete,the principle of concrete hydration heat heating up is explained,and the causes of the concrete temperature cracks are analyzed.In the process of expanding the foundation construction,measuring points are arranged to monitor the temperature of the upper,middle and lower parts of the concrete,and a temperature-time curve analysis is drawn to further verify that the temperature shrinkage cracks can be effectively reduced and the foundation concrete construction quality can be improved when the temperature difference is lower than 25℃.