内部预埋空腔的混凝土厚板温度效应试验研究与计算模拟

Test and simulation on performance of hydration heat in cast-in-situ concrete hollow slab

连续整浇混凝土厚板的非荷载原因开裂一直是工程设计与施工的一个较难处理的问题,从水化热温控和扩大混凝土可散热表面积的思路出发,通过在厚度为300 mm的钢筋混凝土厚板内部均匀设置封闭园管空腔,试验研究了其内外温度变化过程,并通过有限元数值模拟分析,探索这一方法在混凝土连续厚板中用以减小温度效应的有效性.结论认为在混凝土厚板内部设置均匀分布的空腔,不但可以减少混凝土用量,控制水化热总量,而且可以改善内部传热环境,控制内部温升,可以显著减小大体积混凝土的温度变形和温度应力.

In concrete construction, large size slab is used with a mass of concrete cast-in-situ continuously to minimize the deformation and the crack costs much. Based on an idea to embed hollow boxes or tubes into the web of slab to control the hydration deformation and cracking, a series of experimental tests and simulation study were performed. The result showed this new structure worked well. For large dimension concrete slab system, making the slab web hollow inside is a cost-effective method to reduce non-load-caused cracking.