摘要
为了考察不同强度等级混凝土路面板不同季节、不同浇注时间的温度变化规律,建立了基于有限差分方法的综合考虑水化放热以及太阳辐射、大气温度变化等环境作用下路面板温度场数值计算模型。计算结果显示:混凝土路面板温度受太阳辐射和大气温度影响呈周期性变化,白天主要受太阳辐射影响,夜间主要受大气温降影响,浇注初期的水化放热亦对早期温升有贡献。混凝土路面板顶面与底面温度差以1d为周期正负循环。其中温度变化幅度及上下面最大温差以夏季最大、秋冬次之、冬季最小。下午2点浇注和采用较低强度的混凝土可抑制路面板的早期温升和温度梯度。
A numerical model for the temperature field calculation of concrete pavement is aevelopea m mls paper. The effect of hydration heat of cement, solar radiation and atmospheric temperature changes on the temperature field are taking into account in the model. Calculation results show that the temperature in concrete pavement varies periodically by days due to the reaction of solar radiation and atmospheric temperature changes. The hydration heat of cement can contribute to the early age temperature rise. The temperature difference between top and bottom of concrete pavement is cycled by days, positive in daytime and negative at night. The maximum temperature difference between top and bottom is expected in summer, and the minimum difference is expected in winner. The casting time and seasons can also influence the temperature field of concrete pavements.
出处
《工程力学》
EI
CSCD
北大核心
2012年第6期151-159,共9页
Engineering Mechanics
基金
国家自然科学基金项目(50978143)
国家基础研究计划(973)项目(2009CB623200)
关键词
早龄期混凝土
路面板
温度场
水化热
太阳辐射
early age concrete
concrete pavement
temperature field
hydration heat
solar radiation
