AASHTO T134:2005(2013) Standard Method of Test for Moisture-Density Relations of Soil-Cement Mixtures

AASHTO T134:2005(2013) Standard Method of Test for Moisture-Density Relations of Soil-Cement Mixtures.
3.4. Ra1?II?Ier
3.4.1. Manually Operated—Metal rammer with a mass of 2.495 ± 0.009 kg (5.5 ± 0.02 lb), and having a flat circular face of 50.80-mm (2.000-in.) diameter with a manufacturing tolerance of± 0.25 mm (0.01 in.). The in-service diameter of the flat circular face shall he not less than 50.42 mm (1.985 in.). The rammer shall be equipped with a suitable guide sleeve to control the height of drop to a free fall of 305 ± 2 mm (12.00 ± 0.06 in.) above the elevation of the soil. The guide sleeve shall have at least four vent holes, no smaller than 9.5-mm (3/s-in.) diameter, spaced approximately 90 degrees (1.57 radius) apart and approximately 19 mm (3/4 in.) from each end; and shall provide sufficient clearance so that the free fall of the rammer shaft and head is unrestricted.
3.4.2. Mechanically Operated—A metal rammer that is equipped with a device to control the height of drop to a free fall of 305 ± 2 mm (12.00 ± 0.06 in.) above the elevation of the soil and uniformly distributes such drops to the soil surface (Note 2). The rammer shall have a mass of 2.495 ± 0.009 kg (5.5 ± 0.02 lb), and have a flat circular face of 50.80-mm (2.000-in.) diameter with a manufactured tolerance of± 0.25 mm (0.01 in.). The in-service diameter of the flat circular face shall be not less than 50.42 mm (1.985 in.).
Note 2—The rammer apparatus shall be calibrated with several soil-cement mixtures and the mass of the rammer adjusted, if necessary, to give the same moisture-density results as with the manually operated rammer. It may he impractical to adjust the mechanical apparatus so the free fall is 305 mm (12 in.) each time the rammer is dropped, as with the manually operated rammer. To make the adjustment of free fall, the portion of loose soil to receive the initial blow should be slightly compressed with the rammer to establish the point of impact from which the 305-mm (12-in.) drop is determined. Subsequent blows on the layer of soil-cement may all be applied by dropping the rammer from a height of 305 mm (12 in.) above the initial-setting elevation, or when the mechanical apparatus is designed with a height adjustment for each blow, all subsequent blows should have rammer free fall of 305 mm (12 in.) measured from the elevation of the soil-cement as compacted by the previous blow.
3.4.3. Rammer Face—The circular face rammer shall be used, but a sector face may be used as an alternative, provided that the report shall indicate type of face used other than the 50.8-mm (2-in.) circular face and that the sector face shall have an area equal to that of the circular face rammer.
3.5. Sample Extnider—A jack, lever, frame, or other device adopted for the purpose of extruding compacted specimens from the mold. Not required when a split-type mold is used.
3.6. Balances and Scales—A balance or scale conforming to the requirements of M 231, Class G 20. Also, a balance conforming tO the requirements of M 231, Class G 2.
3.7. Diying Oven—A thermostatically controlled drying oven capable of maintaining a temperature of 110 ± 5°C (230 ± 9°F) for drying moisture samples.AASHTO T134 pdf download.