ABSTRACT

Studies to understand the behaviour and structural integrity of square-shaped short slabs have gained enormous interest in the highway pavement community. Unfortunately, the quantification of curling deformations and subsequent performance studies are very limited. This study examines the curling behaviour of cast-in-situ short paneled concrete pavements (CiSPCP) on a lean concrete base (LCB) of NH-18 (old NH-33) test sections. The test site includes CiSPCP of three different slab sizes, thicknesses, and slab – LCB interface conditions. The curling displacements at the centre and edge of the slabs are measured using a simple experimental setup. The slab length is found to have more influence on curling as compared to the thickness and interface condition. Interestingly, the occurrence of slab response is not expeditious with the maximum temperature gradient (TG). The time lag for the response is around two to four and a half hours of the occurrence of a maximum TG. A multi-slab, finite element (FE) four-layer pavement model is developed to represent the CiSPCP test sections and also to reproduce the evolution of the curling response fairly. Field measured and FE computed displacements are compared and conclusions are drawn.

摘要

了解方形短板的行为和结构完整性的研究在高速公路路面社区引起了极大的兴趣。不幸的是，卷曲变形的量化和随后的性能研究非常有限。本研究检查了现浇短镶板混凝土路面 (CiSPCP) 在 NH-18（旧 NH-33）试验段的贫混凝土基础 (LCB) 上的卷曲行为。测试地点包括三种不同板坯尺寸、厚度和板坯-LCB界面条件的CiSPCP。使用简单的实验装置测量板的中心和边缘处的卷曲位移。与厚度和界面条件相比，板坯长度对卷曲的影响更大。有趣的是，在最大温度梯度 (TG) 下，板坯响应的发生并不迅速。响应的时间延迟大约是出现最大 TG 的两到四个半小时。开发了一个多板、有限元 (FE) 四层路面模型来表示 CiSPCP 测试部分，并公平地再现卷曲响应的演变。比较现场测量和有限元计算的位移并得出结论。