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Measuring Thermal Performance of Pavements Containing Phase Change Materials

Measuring Thermal Performance of Pavements Containing Phase Change Materials and Modeling Their Macroscale Response Presented By: Avinaya Tripathi, Arizona State University One of the greatest durability concerns for concrete infrastructure is the increased occur-rences of early- and later-age thermal cracking in reinforced concrete elements. Thermal cracking is a result of tensile stresses exceeding the elements tensile strength. To observe the thermal differences and strains in concrete pavements containing phase change inclu-sions, innovative temperature/strain sensing methods that are accurate, reliable and could be embedded within fresh concrete, are needed. This study reports smart monitoring of con-crete pavements that was accomplished by incorporating wireless temperature and strain sensing technology that monitored and collected continuous data for the duration of the project. Two different wireless temperature and strain sensing systems, that could withstand excessive temperatures and applied thermal-mechanical stresses, were chosen for monitor-ing the structural performance of both pavements. General-purpose strain gages with a working strain range of ±5% and temperature range of -75 to 175 °C were used in both sens-ing systems. The work was able to bring out the specific benefits offered by phase change materials in reducing the early and later age thermal strains in concrete.