AASHTO T245:2015 Standard Method of Test for Resistance to Plastic Flow of Asphalt Mixtures Using Marshall Apparatus.
Note I Instead of the loading jack, a mechanical or hydraulic testing machine may be used. provided the rate of movement can be maintained at 50.8 mm (2 in.)/min while the load is applied.
3.3. Ring Dvnamonieter Asseniblv— -One-ring dynarnometer (Figure 2) of 22.2-kN (5000-ib) capacity and sensitivity of 44.5 N (10 Ib) up to 4.45 kN (1000 Ib) and 111.2 N (25 Ib) between 4.45 and 22.2 kN (1000 and 5000 Ib) shall be equipped with a micrometer dial. The micrometer dial shall be graduated in 0.0025 mm (0.0001 in.) increments. Upper and lower ring dynamomcter attachments are required for fastening the ring dynamometer to the testing frame and transmitting the load to the breaking head. Instead of the ring dynamometer assembly, any suitable load- measuring device may be used, provided the capacity and sensitivity satisfy the above requirements.
3.4. F/ow,;ieter—The flowmeter shall consist of a guide sleeve and a gauge. The activating pin of the gauge shall slide inside the guide sleeve with a slight amount of frictional resistance. The guide sleeve shall slide freely over the guide rod of the breaking head. The flowrneter gauge shall be adjusted to zero when placed in position on the breaking head when each individual test specimen is inserted between the breaking head segments. Graduations of the flowmeter gauge shall be in 0.25-mm (0.01-in.) divisions. Instead of the flowmcter, a micrometer dial or stress—strain recorder graduated in 0.25 mm (0.01 in.) increments may be used to measure flow.
3.5. Ovens or Hot Plates—Ovens or hot plates shall be provided for heating aggregates, asphalt material, specimen molds, compaction hammers, and other equipment to the required mixing and molding temperatures. It is recommended that the heating units be thermostatically controlled so as to maintain the required temperature within 2.8°C (5°F). Suitable shields, baffle plates. or sand baths shall be used on the surfaces of the hot plates to minimize localized overheating.
3.6. Water Bath—The water bath shall be at least 152.4 mm (6 in.) deep and shall be thermostatically controlled so as to maintain the bath at 60 ± 1°C (140 ± 2°F) or 37.8 ± 1°C (100 ± 2°F). The tank shall have a perforated false bottom or be equipped with a shelf for supporting specimens 50.8 mm (2 in.) above the bottom of the bath.
3.7. Air Bath—The air bath for asphalt cutback mixtures shall be thermostatically controlled and shall maintain the air temperature at 25 ± 1°C (77° ± 2°F).
3.8. Thermometers—For water and air baths sensitive to 0.2°C (0.4°F) with a range sufficient to determine the specified bath temperature.
3.9. Vernier Calipers—Calipers readable to 0.1 mm (0.004 in.)
3.10. Miscellaneous—Gloves—For handling hot equipment and other gloves for removing specimens from water bath.AASHTO T245 pdf download.