机场水泥道面日周期温度效应

Effect of Diurnal Temperature Variations on Airport Cement Pavement

摘要:

为研究日温变化对机场水泥道面的影响，系统监测分析了日周期内西南某机场水泥道面板内温度、应变及弯沉的变化规律。结果表明：板内温度、平均温度及温度梯度均呈日周期变化，正、负温度梯度最大值分别出现在14：00— 16：00、07：00—08：00；应变与温度不同步变化导致其随温度滞回变化，以温度梯度?曲率分析道面温度效应可减少滞回特征影响；板角翘曲大于板边，接缝类型差异对板边翘曲影响更大；道面边、角弯沉随日温变化波动明显，接缝传荷系数波动主要受温度梯度变化影响，道面性能评价应考虑温度影响；接缝两侧弯沉之和与温度相关性高，且可能与接缝传荷能力无关，在考虑温度影响进行脱空判定时具有一定优势，建议进一步研究其特征。

关键词:水泥道面;温度;弯沉;板底脱空;接缝传荷

Abstract:

In order to investigate the effect of daily temperature change on airport cement pavement， the variation characteristics of cement slab temperature， strain， and deflection in an airport in southwest China during daily cycle were systematically monitored and analyzed. The results show that the in-plate temperature， average temperature， and temperature gradient change in daily cycle. The maximum positive and negative temperature gradient appear at 14：00—16：00 and 07：00—08：00， respectively. The non-synchronous change of strain and temperature leads to a hysteretic loop， which may be caused by the asynchronous change between each other. The effect of hysteretic characteristics can be reduced by analyzing the relationship between temperature gradient and curvature. The slab corner is curling more significant than the slab edge， and the difference of joint type has a greater effect on the curling of slab edge. The deflections measured at the slab edge and the corner fluctuates obviously with the variation of daily temperature， and the joint load transfer coefficient is mainly affected by temperature gradient. The effect of temperature should be considered in pavement performance evaluation. The sum of deflections on both sides of the joints（SD） has a high correlation with temperature， and may be independent of the joint load transfer capacity. The characteristics of SD give it an advantage in void detection of concrete slab effected by temperature. Further research on the characteristics of SD is needed.

Key words:cement pavements;temperature;deflection;void beneath slab;joint load transfer