ABSTRACT

Prediction of the temperature development at an early age is a good starting point to assess the development of the restrained thermal stress and thermal cracking in rigid pavements. This paper presents a numerical early age concrete pavement temperature prediction model. It enables to evaluate the effect of various paving conditions, such as paving time, curing method, air temperature, wind speed, and the concrete placement temperature, on the early age concrete pavement performance. A critical review of current heat flux models at the pavement surface covered with a plastic sheet is presented. An extension of existing models to quantify the effect of the plastic sheet curing method is introduced, based on the energy balance method. The numerical implementation procedure for the proposed temperature prediction model is solved by the finite difference method. The temperature prediction model was verified with field measured data of two test sections. The predicted temperature shows a satisfying match with field measured data. Lastly, the effect of plastic sheet curing and its duration on the development of the pavement temperature was analysed by the proposed theoretical model.

摘要

对早期温度发展的预测是评估刚性路面受约束的热应力和热裂纹发展的良好起点。本文提出了一种数值计算的早期混凝土路面温度预测模型。它可以评估各种铺装条件，例如铺装时间，固化方法，空气温度，风速和混凝土浇筑温度，对早期混凝土路面性能的影响。提出了对目前覆盖有塑料板的路面热通量模型的严格审查。基于能量平衡方法，介绍了现有模型的扩展，以量化塑料板固化方法的效果。通过有限差分法求解了所提出的温度预测模型的数值实现过程。用两个测试部分的现场测量数据验证了温度预测模型。预测温度与现场测量数据显示令人满意的匹配。最后，通过提出的理论模型分析了塑料板固化及其持续时间对路面温度变化的影响。