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![]() Secondary Centrifuge Used in Solvent Extraction. Open Centrifuge Used in Solvent Extraction.įigure 8. Today, the solvent extraction method is only sparingly used due to the hazardous nature of the specified solvents.įigure 7. A gradation test can then be run on the aggregate to determine gradation. Using this weight and the weight of the original sample a percent asphalt binder by weight can be calculated. The initial and final weights are compared and the difference is assumed to be the asphalt binder weight. The asphalt binder/solvent and aggregate are then separated using a centrifuge (see Figures 7 and 8) and the aggregate is weighed. Typically, a loose HMA sample is weighed and then a solvent is added to disintegrate the sample. Solvent extraction, the oldest of the three test methods, uses a chemical solvent (trichloroethylene, 1,1,1-trichloroethane or methylene chloride) to remove the asphalt binder from the aggregate. Each method offers a way to determine asphalt content and aggregate gradation from an HMA sample. The three major test methods, solvent extraction, nuclear asphalt content gauge and ignition furnace are discussed here. Asphalt Bulk Specific Gravity Device is a computer-driven system that offers speedy and accurate determinations of bulk specific gravity in 4 and 6in (102 and 152mm) asphalt samples.The asphalt content and gradation test can be used for HMA quality control, acceptance testing or forensic analysis.8 Stainless Steel Wire Mesh Basket suspends aggregates and other materials for weighing in water. Heater/Circulator provides accurate temperature control for water tanks and baths up to 7.4gal (28L) capacity. ![]() EZ Mount Heater/Circulator used with Specific Gravity Water Tank to achieve circulation and temperature range needed in testing specific gravity.Density Weighing Cradles for suspension weighing to determine the specific gravity or bulk density of asphalt or aggregates. ![]()
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