大体积混凝土温控防裂技术

Temperature Control and Crack Prevention Technology of Mass Concrete

摘要: 大体积混凝土在施工过程中，由于混凝土的量大，水泥的水化热热量大，在混凝土内外散热不均匀以及受到内外约束的情况下，混凝土内部易产生较大的温度应力，导致混凝土发生开裂。以南盘江特大桥工程的劲性骨架钢筋混凝土拱桥为依托，为防止拱座基坑大体积混凝土温度裂缝的产生，通过计算进行模拟混凝土浇注和水化的放热过程并布置散热管控制混凝土的温度。

Abstract: Due to the large amount of concrete, cement hydration heat and heat, uneven heat dissipation in the concrete inside and outside and under the conditions of internal and external constraints, large volume concrete in the construction process is easy to produce large temperature stress in the concrete resulting in concrete cracking. Based on the stiffened reinforced concrete arch bridge of the South Pan River special bridge project, the heat release process of simulated concrete pouring and hydration is calculated and the temperature of the concrete is controlled by the arrangement of the heat dissipation tube in order to prevent the formation of the large volume concrete temperature cracks in the arch foundation pit.