超宽分离式混凝土箱梁冬季施工水化热效应研究

Hydration Heat Effect of the Ultra-Wide Separated Concrete Box Girder in the Winter Construction

摘要: 本文通过对超宽分离式箱梁在冬季混凝土施工过程中水化效应的现场实测，结合现场实验及理论分析，合理降低混凝土入模浇筑温度，使有利于控制混凝土水化热的温差，在采取有效的保温措施后降低早期冻害风险，通过对混凝土内部、表面、环境的温度监测，得出既可以控制裂纹又可以控制低温环境下混凝土不受冻的措施与方法，研究结果对混凝土表面的裂纹控制在施工中有指导意义。

Abstract: Based on the hydration heat effect of the ultra-wide separated concrete Box Girder in the winter construction, and combining field test with theoretical analysis, this article draws the conclusion that decreasing the temperature about injecting concrete into mold reasonably does good to controlling temperature difference of concrete hydration heat and can decrease the cold damage after taking effective thermal insulation measurement. Through monitoring the concrete inside, outside, and environmental temperature, we obtain the effective method about controlling the crack quantities and promoting the anti-freezing characteristic of the concrete in the low temperature simultaneously. The results of this research have guiding significance to controlling the crack quantities in the construction.