INVESTIGATION OF MIX DESIGN PARAMETERS AFFECTING THE THERMAL PROPERTIES OF ASPHALT CONCRETE UNDER TRANSIENT AND STEADY-STATE HEAT TRANSFER CONDITIONS

Date

2024-1-24

Author

Demirtürk, Duygu

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The reliability of the measurement methods and the thermal properties of the mix components play a crucial role in determining the thermal properties of asphalt concrete. In this thesis, a study plan is proposed to analyze the effect of mix design parameters on the thermal properties of asphalt concrete under both transient and steady-state heat transfer conditions. The laboratory samples are prepared using the Superpave Gyratory Compactor and cut into appropriate sizes for testing under steady-state and transient conditions. The measurement of thermal conductivity under transient conditions is conducted using a Transient Plane Source (TPS) device. While a steady-state test setup is developed in the laboratory to measure thermal conductivity, a separate calorimetry-based setup is used to measure the specific heat capacity of the samples. The results obtained with the TPS device show that not only the microstructural properties of the mixture but also the mix design parameters, i.e., the aggregate type, the air void content, and the maximum aggregate size, are important for the thermal conductivity of the samples. The measurements with the calorimetry-based setup show that all mixture components, i.e., aggregates, bitumen, and air voids, as well as the initial conditioning temperature, influence the specific heat capacity of the samples. Under steady-state conditions, only the aggregate type appears to be an influential factor, while the other properties of the mixture are all insignificant. Given the measured thermal properties, it appears that the aggregate type is by far the most influential mixture component affecting the thermal properties of the mixtures.

Subject Keywords

Thermal Conductivity, Specific Heat Capacity, Heat Transfer, Transient Plane Source, Asphalt Concrete

URI

https://hdl.handle.net/11511/108371

Collections

Graduate School of Natural and Applied Sciences, Thesis