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首页> 外文学位 >Analysis, testing and verification of the behavior of composite pavements under Florida conditions using a heavy vehicle simulator.
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Analysis, testing and verification of the behavior of composite pavements under Florida conditions using a heavy vehicle simulator.

机译：使用重型车辆模拟器对佛罗里达州复合路面的性能进行分析，测试和验证。

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摘要

Whitetopping (WT) is a rehabilitation method to resurface deteriorated asphalt pavements. While some of these composite pavements have performed very well carrying heavy load, other have shown poor performance with early cracking. With the objective of analyzing the applicability of WT pavements under Florida conditions, a total of nine full-scale WT test sections were constructed and tested using a Heavy Vehicle Simulator (HVS) in the APT facility at the FDOT Material Research Park. The test sections were instrumented to monitor both strain and temperature. A 3-D finite element model was developed to analyze the WT test sections. The model was calibrated and verified using measured FWD deflections and HVS load-induced strains from the test sections. The model was then used to evaluate the potential performance of these test sections under critical temperature-load condition in Florida.; Six of the WT pavement test sections had a bonded concrete-asphalt interface by milling, cleaning and spraying with water the asphalt surface. This method produced excellent bonding at the interface, with shear strength of 195 to 220 psi. Three of the test sections were intended to have an unbonded concrete-asphalt interface by applying a debonding agent in the asphalt surface. However, shear strengths between 119 and 135 psi and a careful analysis of the strain and the temperature data indicated a partial bond condition.; The computer model was able to satisfactorily model the behavior of the composite pavement by mainly considering material properties from standard laboratory tests and calibrating the spring elements used to model the interface. Reasonable matches between the measured and the calculated strains were achieved when a temperature-dependent AC elastic modulus was included in the analytical model.; The expected numbers of repetitions of the 24-kip single axle loads at critical thermal condition were computed for the nine test sections based on maximum tensile stresses and fatigue theory. The results showed that 4" slabs can be used for heavy loads only for low-volume traffic. To withstand the critical load without fear of fatigue failure, 6" slabs and 8" slabs would be needed for joint spacings of 4' and 6', respectively.
机译：Whitetopping（WT）是一种修复变质的沥青路面的修复方法。尽管其中一些复合路面在承受重载时表现非常出色，但其他路面表现出较差的早期开裂性能。为了分析在佛罗里达州条件下WT路面的适用性，在FDOT材料研究园的APT设施中使用重型车辆模拟器（HVS）构造并测试了总共九个全尺寸WT测试段。测试部分用仪器监测应变和温度。开发了3-D有限元模型来分析WT测试截面。使用测得的FWD挠度和测试部分的HVS载荷引起的应变对模型进行校准和验证。然后将该模型用于评估在佛罗里达州的临界温度负载条件下这些测试部分的潜在性能。 WT路面测试部分中的六个通过碾磨，清洁并用水喷涂沥青表面而具有粘结的混凝土-沥青界面。该方法在界面处产生了出色的粘合力，剪切强度为195至220 psi。通过在沥青表面上施加脱胶剂，三个测试区域的水泥-沥青界面不粘结。但是，在119至135 psi的剪切强度以及对应变和温度数据的仔细分析表明存在部分粘结条件。通过主要考虑标准实验室测试中的材料特性并校准用于对界面建模的弹簧元件，该计算机模型能够令人满意地对复合路面的行为进行建模。当在分析模型中包括温度相关的交流弹性模量时，可以在测量应变和计算应变之间实现合理匹配。根据最大拉伸应力和疲劳理论，针对九个测试部分计算了在临界热工况下24基普单轴负载的预期重复次数。结果表明，4“平板仅可用于低流量的重载。要承受临界载荷而不必担心疲劳破坏，4'和6'的关节间距将需要6”平板和8“平板， 分别。

著录项

  • 作者

    Tapia Gutierrez, Patricio Enrique.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Engineering Civil.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 247 p.
  • 总页数 247
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;工程材料学;
  • 关键词

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