AASHTO T 78:2014 Standard Method of Test for Distillation of Cutback Asphalt Products

AASHTO T 78:2014 Standard Method of Test for Distillation of Cutback Asphalt Products. 7. PREPARATION OF APPARATUS 7.1. Calculate the mass of 200 mL (6.8 oz) of the sample from the specific gravity of the material at 15.6/15.6°C. Add this amount ± 0.5 g into the 500-rnL (16.9-oz) flask. 7.2. Place the flask in the shield supported by two sheets of gauze on a tripod or ring. Connect the condenser tube to the tubulature of the flask with a tight cork joint. Clamp the condenser so that the axis of the bulb of the flask through the center of its neck is vertical. Adjust the adapter over the end of the condenser tube so that the distance from the neck of the flask to the outlet of the adapter is 650 ± 50 mm (25.6 ± 2.0 in.) (see Figure 2). 7.3. Insert the thermometer through a tightly fitting cork in the neck of the flask so that the bulb of the thermometer rests on the bottom of the flask. Raise the thermometer 6 mm (0.25 in.) from the bottom of the flask using the scale divisions on the thermometer to estimate the 6-mm (0.25-in.) distance above the top of the cork. 7.4. Protect the burner by a suitable shield or chimney. Place the receiver so that the adapter extends at least 25 mm (1 in.) but not below the I 0O-inL (3.4-oz) mark. Cover the graduate closely with a piece of blotting paper, or similar material, suitably weighted. which has been cut to lit the adapter snugly. 7.5. The flask, condenser tube, adapter, and receiver shall be clean and dry before starting the distillation. Place the seamless residue container on its cover in an area free from drafis. 7.6. Pass cold water through the condenser jacket. Use warm water, if necessary, to prevent formation of solid condensate in the condenser tube. 8. PROCEDURE 8.1. Correct, to the nearest 1°C (2°F), the temperatures to be observed in the distillation for barometric pressure in millimeters of mercury. if the prevailing barometric pressure in millimeters of mercury is known, correct the temperature to be observed with the factors shown in Table 1. Do not correct for the emergent stem of the thermometer if used. See the example corrections that follow. Correction = (observed pressure in mmHg — 760) x correction per inmi-Ig Correction per rnrnHg 1/c the correction per 10 mrnHg given...