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7. MATERIALS--Commercial bottled air or equivalent.<br />
8. HAZARDS--Use standard laboratory safety procedures in handling the hot asphalt binder<br />
when preparing test specimens and removing the residue from the PAV. Use special<br />
precaution when lifting the vessel.<br />
9. CALIBRATION AND STANDARDIZATION<br />
9.1 Temperature Detector--Verify the calibration of the RTD to 0. I°C at least every<br />
6 months using a calibrated thermometer.<br />
9.2 Pressure gauge--Calibrate the pressure gauge to an accuracy of 1% of the<br />
desired pressure at least every 6 months.<br />
NOTE4.--The pressure gauge is usually calibrated by the manufacturer or a commercial calibration service.<br />
Verification of the continued stability of the pressure gauge within the specified requirements should be done<br />
periodically by checking against another certified pressure measurement device.<br />
10. PROCEDURE<br />
10.1 Condition the asphalt binder and determine the mass change during conditioning<br />
in accordance with T240 (RTFOT) or T179 (TFOT).<br />
10.2 Combine the hot residue from the RTFOT into a single container, stir to blend,<br />
then transfer into (or leave in) TFOT pans for PAV conditioning or allow the hot residue in<br />
the container to cool to room temperature and cover and store at room temperature for PAV<br />
conditioning at a later date. If conditioned asphalt binder is allowed to cool to room<br />
temperature, heat it until it is sufficiently fluid to pour and stir it before pouring it into the<br />
TFOT pans. To remove asphalt binder from RTFOT bottles, scraping of the bottles is<br />
allowed, to assure sufficient material is obtained for later testing. Scraping is not currently<br />
allowed in T240. If scraping is used, report with the test results.<br />
10.3 Place the pan holder inside the PAV. If an oven is used, place the pressure<br />
vessel inside the oven. If an integrated temperature control pressurized aging vessel is used,<br />
turn on the heater. Select an aging temperature and preheat the vessel to the aging<br />
temperature selected.<br />
NOTE5.--If<br />
from table 1 of MP1.<br />
conditioning asphalt binders for conformance to MP1, select the appropriate aging temperature<br />
NOTE6.--Preheating the vessel 10 to 15"C above the conditioning temperature can be used to reduce the<br />
drop in PAV temperature during the loading process and minimize the time required to stabilize the system, after<br />
loading, to attain the required temperature.<br />
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