Thermal properties of permeable friction asphalt mixture and estimation of temperature profiles

Abstract

The compaction of asphalt mixture at a proper temperature range is a very important factor to get the desired density of the asphalt mixture. The aim of this study was to determine the time at which the desired temperature is achieved and to investigate the effect of the permeable friction course (PFC) asphalt mixture properties on thermal conductivity. The thermal conductivity was measured using a surface probe type, and the values of thermal conductivity of PFC mixtures were smaller compared to dense-graded mixture. The relationships between thermal conductivity and asphalt mixture properties were investigated. Compaction temperature profiles were predicted using a simulation program that is developed based on one-dimensional (1D) heat conduction equation, finite difference method and environmental conditions. The results of the predicted temperature profiles were evaluated by comparing the measured in situ temperature profiles during compaction. From the results, it was found that the predicted time at a specified temperature could be used to determine the compaction time.

Keywords:

• permeable friction course
• thermal conductivity
• compaction time
• finite difference equation

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2011-0021820)

Notes

^1. [email protected]

Additional information

Notes on contributors

In-Tai Kim

1 1. [email protected]