A METHOD OF PREDICTING COMPACTION TIME FOR HOT-MIX BITUMINOUS CONCRETE

A heat-transfer model was used to develop an accurate and flexible procedure for predicting the available compaction time for hot-mix bituminous concrete placed during various climatic conditions, and the extrinsic and intrinsic factors which have the greatest influence on the cooling rate of hot-mix bituminous concrete were determined. The predictive method is presented as a climatic input chart and several accompanying compaction time curves. The compaction time curves were developed for numerous pavement systems, initial pavement surface temperatures, and initial bituminous mixture temperatures. The time for the bituminous concrete layer to reach an average temperature of 175 F was used as the available compaction time. The validity of the procedure is supported by excellent comparisons between the measured and predicted compaction times. The results of the study indicate that an increase in the bituminous mixture temperature, existing surface temperature, and layer thickness will increase the available compaction time. An increase in wind velocity causes a decrease in the available compaction time. A solar radiation increase will cause an increase in the available compaction time. Hot mix bituminous concrete lifts placed during cold weather should be greater than 1 in. thick. Air temperature alone is not a valid criterion for determining whether bituminous concrete paving can be accomplished during cold weather. The method developed provides a procedure whereby interaction of the climate, pavement system, bituminous mixture temperature, and equipment capabilities can be evaluated to produce a paving operation which is effective and efficient. The method developed to predict compaction times can be used to establish specifications for cold weather bituminous concrete construction.

  • Supplemental Notes:
    • Proceedings of the meeting held in Houston, Texas, February 1973.
  • Corporate Authors:

    University of Minnesota, Minneapolis

    155 Experimental Engineering Building
    Minneapolis, MN  United States  55455
  • Authors:
    • Tegeler, P A
    • Dempsey, B J
  • Conference:
  • Publication Date: 1973

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 499-523
  • Serial:
    • Volume: 42

Subject/Index Terms

Filing Info

  • Accession Number: 00127338
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 16 1975 12:00AM