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The coreLok is an extremely versatile system for measurement of bulk specific gravity and maximum specific gravity (Gmm) of asphalt. The CoreLok also measures the apparent specific gravity, absorption and bulk specific gravity of fine and coarse aggregates. GravitySuite™ PC software can be used to calculate and manage the results. The CoreLok does not require an empirical calibration and the results do not depend on material type or composition.

CoreLok performs 5 standard lab tests: 

  • Bulk Specific Gravity        
  • Maximum Specific Gravity
  • Aggregate Specific Gravity 
  • Porosity
  • % Asphalt Content


  • Measurements are not dependent on mix specific calibrations
  • Works with different sample sizes and shapes
  • Non-Nuclear
  • Fully automatic sealing process 
  • Large Vacuum chamber                                     
  • Puncture resistant, easy to use polymer bags for lab and field sample testing
  • Meets local and national equipment standards and requirements
  • 110 Volt standard operation (220 volt optional)
  • Measurements are not dependent on any inputs or empirical calibrations
  • Low maintenance


  • Accurate specific gravity and air voids measurements         
  • Improved correlation between field, laboratory and nuclear gauge density results
  • Excellent repeatability
  • Minimal operator involvement
  • No wax dipping, wrapping with film or trimming required
  • Samples remain dry and uncontaminated for further testing purposes 
  • Complete sealing process in approximately 2 minutes          
  • No license required

Download spec sheet    CORELOK GMM    CORELOK AGGPLUS