Measuring Thermal Effect in the Structural Response of Flexible Pavement Based on Field Instrumentation

Temperature affects the structural response of flexible pavement in two ways. Firstly, the pavement material expands and contracts for temperature variations and produces thermal strain. Secondly, when pavement temperature changes, the modulus of the asphalt concrete (AC) changes and consequently, the stress-strain responses for a particular vehicle also change. This study describes both of these phenomenon based on field instrumentation on an interstate pavement, Interstate 40 (I-40), in the state of New Mexico, United States of America. Continuous horizontal strains at the bottom of the AC and vertical stresses at different depths of the pavement are measured for an eighteen-wheel vehicle from June 8 to November 3, 2012. The horizontal strains are measured with installed Horizontal Asphalt Strain Gauges (HASGs) and the vertical stresses with Earth Pressure Cells (EPCs). Results show that the vertical stresses and the horizontal strains at the bottom of AC layer increase up to 1.88 and 1.41 times, respectively, in the afternoon than those in the morning for the climate condition in New Mexico for the above mentioned period.


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  • Accession Number: 01490362
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 20 2013 5:24PM