碾压混凝土大坝大升层施工温控技术

Temperature Control Technology for Mass Concrete Lift of Roller-compacted Concrete Dam

碾压混凝土高坝施工中的升层高度直接影响施工进度,经济、高效的大升层施工是其首选。对于体形庞大的大坝混凝土而言,大升层意味着大体积。如何解决混凝土水化热带来的温度升高问题就成为迫在眉睫的重中之重,必须采取有效的温控手段控制混凝土裂缝的发生。乌弄龙水电站大坝混凝土施工通过温控计算与分析后,从混凝土配合比、出机口温度、运输过程、浇筑过程、通水冷却等方面采取了有效的温控措施,质量可靠,所取得的经验值得类似工程推广应用。介绍了所采用的温控措施。

The height of each concrete lift poured during construction of roller-compacted concrete dam directly effects the construction progress;the economic and efficient placement of each concrete lift is of great importance.Regarding concrete embankment for roller-compacted concrete dam,a lift with large volume is actually a mass concrete.To avoid concrete cracks caused by temperature rise due to concrete hydration is of the top priority.After calculation and analysis,temperature control measures are taken during the whole process of dam concreting of Wunonglong Hydropower Station,from concrete mix design,discharging,transportation,placement to water-cooling.It has been proved that the quality of the roller-compacted concrete dam is reliable and the temperature control measures are worthy of being popularized and applied in similar projects.Temperature control measures are introduced in this paper.