DEVELOPMENT OF ROLLING COMPACTION MACHINE FOR PREPARATION OF ASPHALT BEAM SAMPLES

A rolling compaction machine developed for fabricating asphalt beam samples is described. The machine was developed as a part of a research program for evaluating the rutting resistance of asphalt mixes using the loaded wheel tester. The uniqueness of this machine is that the asphalt beam sample is compacted by a rolling compaction action that simulates the compaction of asphalt mixes in the field. The machine is capable of fabricating beam samples up to 375 mm long by 175 mm wide by 125 mm thick. The overall dimensions of the machine are 1.2 m long by 0.45 m deep by 1.3 m high. The machine is portable and easy to operate. The experience of the Georgia Department of Transportation through one year of extensive use of this machine has shown that it can improve quality and productivity of fabricating asphalt beam samples. Results of the bulk densities of the asphalt beam samples fabricated by this compaction machine as well as by the static compaction procedure using a universal testing machine are presented. Three types of asphalt mixes--a surface mix, a base mix, and a stone mastic asphalt mix--were used for preparing the beam samples by the different compaction methods. To evaluate the density variation in each beam sample, the density of the whole beam was first measured, the sample was then sawed in sections (sometimes as many as 12), and densities of all sections were measured. Results from three studies presented indicated that the maximum variation of density for beam samples compacted by the rolling compaction procedure was under 1.5%. Visual observations of all asphalt beam samples made by the three compaction methods showed that samples prepared by rolling compaction have the least amount of crushed aggregates.

Language

  • English

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 18-25
  • Monograph Title: Hot-mix asphalt design, testing, evaluation, and performance
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00714829
  • Record Type: Publication
  • ISBN: 309061563
  • Files: TRIS, TRB
  • Created Date: Dec 4 1995 12:00AM