SEDL / STP / STP1299-EB / STP16312S

Consideration of Hot Mix Asphalt Thermal Properties During Compaction

Chadbourn, BA
Research fellow, research assistant, associate professor, and associate professor, University of Minnesota, Minneapolis, MN

Luoma, JA
Research fellow, research assistant, associate professor, and associate professor, University of Minnesota, Minneapolis, MN

Newcomb, DE
Research fellow, research assistant, associate professor, and associate professor, University of Minnesota, Minneapolis, MN

Voller, VR
Research fellow, research assistant, associate professor, and associate professor, University of Minnesota, Minneapolis, MN

Pages: 15    Published: Jan 1996

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Abstract

A computer program was developed at the University of Minnesota to predict asphalt concrete cooling times for road construction during adverse weather conditions. Cooling models require extensive experimental data on the thermal properties of hot-mix paving materials. A sensitivity analysis was performed to determine which thermal properties affect pavement cooling times significantly. The results indicated that more information on asphalt thermal conductivity and thermal diffusivity is required. Two suitable test methods for determining these properties at typical paving temperatures and densities were developed, and preliminary results for dense-graded and stone-matrix asphalt (SMA) mixes agreed well with values reported in the literature.