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September 20, 2021
  All Categories  >  Asphalt Pavement Testing (+Superpave)  >  Specific Gravity
  Product Information
CoreLok Density Measurement Device
Model: MTSG-1
Price: Inquire
Condition: New
Warranty: Yes
Availability: Usually ships in 2-5 days
   Product Model # Price   Sale Price Qty
 AggPlus System w/AggSpec Software   MTSG-1A6   Inquire
 Bag Roll Dispenser   MTSG-1A5   Inquire
 CoreLok Bags-large 15x18 inch (100/box)   MTSG-1A2   $100.00      
 CoreLok Bags-small 10x14 inch (100/box)   MTSG-1A1   $100.00      
 CoreLok Channeled Bags 11x15 inch (100/box)   MTSG-1A3   $100.00      
 Testing Tank w/Stainless Steel Sample Basket   MTSG-1A4   $1,200.00      
 Vacuum Verification Gauge   MTSG-12A1   Inquire
  Other Models
   Product Model # Price   Sale Price Qty
 CoreLok Density Measurement Device, 220V/50Hz   MTSG-1F   Inquire
  The CoreLokTM is a system for sealing asphalt samples so that the sample densities may be measured by water displacement method.

Samples are automatically sealed in specially designed puncture resistant polymer bags.

Densities measured with the Corelok system are highly reproducible and accurate. The results are not dependent on material type or sample shape.

The included GravitySuite PC software package calculates and manages your data for ease of operation.


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

Bulk Specific Gravity of Compacted samples:

Specific gravity (density) is the single most specified parameter in the construction industry. For open graded mixes (i.e. SMA and OGFC) and absorptive mixtures of asphalt, the Saturated Surface Dry (SSD) method is inaccurate. Water infiltration in and out of the sample produces a lower than actual measurement for sample volume, higher calculated density and a lower estimate of air voids. The CoreLok system automatically seals these samples in specially designed polymer bag and allows for measurement of accurate water displacement test. The present sealing methods, Wax and films, are labor intensive and the results are extremely operator dependent.

Maximum Specific Gravity (Gmm)
This method may be used as an alternative to the conventional "Rice Test" for the determination of maximum specific gravity of loose asphalt mixtures. The CoreLok test can be completed in seven minutes with minimal exposure to water, eliminating the need for a lengthy "Dry Back" method.

This procedure requires that a sample of dry asphalt mixture is placed inside the vacuum bags and sealed within the CoreLok vacuum chamber. The bags are then cut open under water and a submerged weight is determined. The weight in air and the submerged weight can be used to calculate the maximum specific gravity of the asphalt mixture

Apparent Specific Gravity, Absorption and Bulk Specific Gravity of Aggregates:

Oven dry aggregates are used in this test to determine the specific gravity and absorption of fine or coarse aggregates in less than 20 minutes. This test is highly accurate and repeatable. In this test, a density measurement is obtained by fully saturating the sample with CoreLok and another density is measured under an unsaturated condition. These two densities can be used with already known equations to calculate apparent specific gravity, absorption and bulk specific gravity. The AggSpecTM PC software allows for simple entry and calculation of these parameters.

Porosity of Compacted Asphalt samples:

Porosity is the measure of the percentage of water permeable voids in a compacted sample. Porosity gives an accurate estimate of sample permeability. You can now determine the interconnectivity of voids within your sample and determine your mix performance during design or after lay down. Two different mixes with 7% air voids can have different permeability performance on the field, depending on the interconnectivity of voids. However, these same mixes will never have the same porosity. For open graded mixes Porosity is a more meaningful measure of performance than % air voids. GravitySuite software included with CoreLok provides automatic calculation of porosity based on a sealed and unsealed density of your sample.

Percent Asphalt Calculation:

Use the CoreLok to get an accurate measure of percent asphalt. The measurements using the CoreLok, involves the determination of gravity of combined aggregate, only available with the CoreLok unit, and maximum gravity of your mixture. These two critical measurements of your mixture can be used with the standard Superpave™ equations to accurately calculate the %AC in your mixture. This method is unique and very accurate for determination of %AC for difficult aggregates with significant variability and breakdown in the NCAT ignition furnace. The CoreLok method is simple and can be completed in less than 20 minutes.

  • Measurements are not dependent on mix specific calibrations
  • Works with different sample sizes and shapes
  • Fully automatic sealing process
  • Large vacuum chamber
  • Puncture resistant, easy to use polymer bags for lab and field sample testing
  • Measurements are not dependent on any inputs or empirical calibrations
  Testing Standards
  • AASHTO T166, T275
  • ASTM D 6752-02
  • ASTM D 1188, D 2726


  • 110 Volt standard operation (220 volt optional)
  • 1.5 hp rotary vacuum pump
  • Vacuum oil non-detergent mineral oil of viscosity class ISO VG 32
  • 16.5 inch (419mm)automatic double wire sealing strip


  • Net Dimensions: Chamber size 17"X17"X7" (Dome), 432X432X178mm
  • Shipping Dimensions: Inquire


  • Net Weight: 170 pounds (75 Kg)
  • Shipping Weight: 200 pounds (90 Kg)

Included Accessories

  • Puncture-resistant bags (1 each for 4" & 6" sample)
  • Gravity Suite Software
  • Sample Sliding Plate
  • Chamber Filler Plates (Qty. of 3)
  • Scissors
  • Basket Hanger Rod
  • 30 Gallon Test Tank and SS Sample Basket
  • Core Edge Breaker
  • Manual of Operation

Additional Documentation

Click here to see CoreLok's AC calculations (sample)


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