水泥混凝土路面板硬化翘曲时程变化实测分析

发布时间：2018-06-08 22:27

  本文选题：道路工程 + 等效内嵌温度梯度　； 参考：《公路交通科技》2017年08期

【摘要】：通过铺筑足尺水泥混凝土路面,在连续观测混凝土板不同深度早龄期温度场的同时,基于自主开发的竖向变形观测装置观测了端部自由板和内部约束板在整个早龄期的竖向翘曲变形历史。在此基础上推导了基于五测点的等效线性温度梯度计算公式,提出了基于板的翘曲变形时程和温、湿度时程的水泥混凝土路面板硬化翘曲直接量测方法,为硬化翘曲存在形态的试验量测提供了一种新的分析方法。分析表明:端部自由板翘曲变形幅值(-0.3~1 mm)远高于内侧完全约束板的相应位置(-0.2~0.3 mm)。受约束程度、湿度梯度、温度梯度等因素的影响,板的翘曲呈现显著的非对称性。约束稳定区域等效线性温度梯度随龄期逐渐衰减和稳定至1℃/m,自由板边与自由板角等效内嵌温度梯度时变规律多样。水泥混凝土路面板等效内嵌温度梯度主要集中在-25~25℃/m范围内,约占水泥混凝土路面设计所采用温度梯度的25%,不可忽略,但具体幅值需依据具体路面结构、板块尺寸、早龄期温湿度历史以及混凝土材料性能等因素通过计算或现场实测进行评估。
[Abstract]:Through the construction of full-scale cement concrete pavement, the temperature field of concrete slab at different depths in early age is observed continuously at the same time, Based on the self-developed vertical deformation observation device, the vertical warping history of the end free plate and the inner restraint plate during the whole early age was observed. On the basis of this, the equivalent linear temperature gradient calculation formula based on five measuring points is derived, and the direct measurement method of cement concrete pavement slabs hardening warpage based on the time history of warpage, temperature and humidity is put forward. A new analytical method is provided for the experimental measurement of the existence of hardening warpage. The analysis shows that the warpage amplitude of the end free plate is much higher than that of the inner completely confined plate. Under the influence of constraint degree, humidity gradient and temperature gradient, the warpage of the plate shows significant asymmetry. The equivalent linear temperature gradient in the constrained stable region gradually attenuates and stabilizes to 1 鈩，

本文编号：1997432