Bulk Specific Gravity Measurement of Compacted Hot-Mix Asphalt Samples Using Three-Dimensional Optical Scanning

Accurate determination of bulk specific gravity of compacted hot mix asphalt (HMA) samples is an important step in ensuring quality of asphalt pavements. A measurement of the mass and the sample volume are required to calculate the bulk specific gravity. Measuring the sample volume can be complicated, especially for open graded and porous mixtures. The two most common methods for measuring the volume of HMA samples are water displacement and vacuum sealing methods. The water displacement method (SSD) is not recommended for measurement of absorptive and open graded samples with significant interconnected voids. The vacuum sealing method (CoreLok) is the recommended method for measuring open graded and absorptive HMA samples. A low cost volume measurement technique that requires minimal operator involvement and would produce good precision and accuracy will be a valuable tool to material scientists, engineers and technicians. A new automatic three-dimensional optical scanner with integrated software is proposed for measurement of HMA sample volume. The laser scanner used in this study is capable of collecting detailed contours of the peripheral surface and reconstructing a precise three-dimension digital model of the HMA sample. The software configures and calculates the volume which can be used along with sample mass to calculate the HMA sample density. In this study, the precision and bulk specific gravity measurement of InstroTek’s 3D scanner was compared with SSD and the CoreLok methods for several different laboratory prepared samples.

Language

  • English

Media Info

  • Media Type: DVD
  • Features: Figures; Photos; References; Tables;
  • Pagination: 16p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01154903
  • Record Type: Publication
  • Report/Paper Numbers: 10-0801
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 10:23AM