Bulk Specific Gravity of Compacted samples

Specific gravity (density) is the single most specified parameter in the construction industry. For open graded 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 ten 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 AggSpec^TM PC software allows for simple entry and calculation of these parameters.

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For details and pricing on the CoreSnap or any other material testing equipment you can contact our office toll free at 1-800-263-9244 or e-mail us at info@mltest.com.
M&L Testing Equipment (1995) Inc. is Canada's largest distributor of material testing equipment and would be happy to assist you in anyway.