AASHTO T 319-15 pdf free download

AASHTO T 319-15 pdf free download.Quantitativel Extraction and Recovery of Asphalt Binder from Asphalt Mixtures.
4. SUMMARY OF METHOD
4.1. The asphalt mixture is repeatedly washed and filtered with solvent in an extraction/filtration apparatus. Each filtrate is distilled under vacuum in a rotary evaporator with the asphalt remaining in the flask. After recovery of the final filtrate, the solution is concentrated to about 300 mL and centrifuged to remove the aggregate fines. The decanted solution is distilled under vacuum to remove the extraction solvents. Nitrogen gas is introduced during the final phase of distillation to drive off any remaining traces of solvents. The quantity of asphalt binder in the asphalt mixture is calculated (optional) and the recovered asphalt (distillation residue) sample is subjected to further physical and chemical testing as required. The recovered aggregate can then be used for sieve analysis or other aggregate testing, if desired.
5 SIGNIFICANCE AND USE
5.1. This method is used for obtaining recovered asphalt binder residue samples from asphalt mixture samples for further physical and chemical analyses, and for the optional calculation of asphalt binder content.
6. APPARATUS
6.1. Extraction Vessel”2—The extraction vessel shall be a device as shown in Figure 1, and shall have a 130-mm-long piece of 150-mm l.D. Schedule 80 aluminum pipe or Schedule 80, Grade 304 stainless steel pipe (Figure 2) with removable top and bottom 13-mm-thick aluminum or stainless steel plates. The top plate (Figure 3) shall have a mixing motor mount and 19-mm port for adding solvent. The bottom plate (Figure 4) shall be equipped with a quick-connect fitting. Four l00-by-25-mm baffles (Figure 5) shall be mounted in the extraction vessel, followed by a 3-mm aluminum ring. 2-mm (No. 10) mesh screen, spacer (Figure 6), 0.3-mm (No. 50) mesh screen, another spacer, 0.075-mm (No. 200) mesh screen, then another 2-mm (No. 10) mesh screen, as shown in Figure 1.
6.2. In-Line Filter3 —T he in-line fine filter apparatus shall be a cartridge type with 20-pm retention and at least 820 cm3 of effective filter area. The filter apparatus shall be able to be removed from the system to accommodate weighing before and after the procedure. The filter shall be capable of withstanding heat up to 135°C without degradation in order to accommodate oven drying of the filter apparatus.
6.3. Filtrate Flasks wit/i Tubulation—l 000 mL (two required).
6.4. Round-Bottom Flask—i 000 rnL, with cork stands.
6.5. Gas Flowmeter—Capable of indicating a gas flow up to 1000 mL/min.
6.6. Rotary Evaporator Device4—with transfer and purge tubes, capable of holding a recovery flask in
oil at a 150 angle and rotating at 40 r/min.
6.7. Hot Oil Bat/i—Capable of heating oil to 180°C.
8. HAZARDS
8.1. Use solvents only under a fume hood or with an effective surface exhaust system in a well- ventilated area. Observe the manufacturer’s recommended safety precautions when using compressed nitrogen.
9. SAMPLING
9.1. Obtain asphalt mixture samples in accordance with T 168. When sampling from a compacted roadway, remove specimens from the roadway in accordance with ASTM D5361/D5361M. When sampling RAP, refer to R 90 for aggregate sampling.
12.4.2. Turn off the vacuum, then clean and disconnect the recovery flask and pour the contents into the centrifuge bottles using a funnel and screen to prevent the boiling beads from entering the bottles. Fill the bottles so that their masses are equal. W ash any remaining residue from the recovery flask into the centrifuge bottles. Increase the oil bath temperature to 174士2.5°C. Centrifuge the bottles at 3600 r/min for 25 min.AASHTO T 319-15  pdf download.