AASHTO T 240:13(2017) Standard Method of Test for Effect of Heat and Airon a Moving Film of Asphalt Binder ( RollingThin-Film Oven Test). 3. SUMMARY OF TEST METHOD 3.1. A moving film of asphaltic material is heated in an oven for 85 mm at 163°C (325°F). The effects of heat and air are determined from changes in physical test values as measured before and after the oven treatment. The residue from this test is also used for additional testing as required in M 320. An optional procedure is provided for determining the change in sample mass. 3.2. Precision values for this test method have been developed for viscosity at 60°C (140°F), ductility at 15.6°C (60°F). and mass change. 4. SIGNIFICANCE AND USE 4.1. This method indicates the approximate change in properties of asphalt binder during conventional batch plant and drum mix plant mixing at about 150°C (302°F) as indicated by viscosity and other rheological measurements. The residue from this test is also used to determine the conformance of an asphalt binder to M 320. It yields a residue that approximates the condition of the asphalt binder immediately after the pavement is constructed. If the mixing temperature differs appreciably from 1 50°C (302°F), more or less effect on the properties will occur. This method can also be used to determine mass change, which is a measure of asphalt binder volatility and mass changes resulting from oxidation. 5. APPARATUS 5.1. Oven—A double-walled electrically heated convection type with inside dimensions as follows: a height of 381 mm (15 in.), a width of 483 mm (19 in.), and a depth (with door closed) of 445 ± 13 mm (171/2 ± 1/2 in.). The door shall contain a symmetrically located window with dimensions of 305- to 330-mm (12- to 13-in.) wide by 203- to 229-mm (8- to 9-in.) high. The window shall contain two sheets of heat-resistant glass separated by an air space. The window should permit an unobstructed view of the interior of the oven. The heating element shall be located below the oven floor and shall be adequate to maintain the required temperature. The oven shall be vented at the top and bottom. The bottom vents shall be located symmetrically to supply incoming air around the heating elements. They shall have an open area of 15.0 ± 0.7 cm2 (2.31 ± 0.11 in.2). The top vents shall be symmetrically arranged in the upper...
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