 |
|||
|
|
|||
| ||||||||||
|
|  weight of the total mix. The contractor may, at his option, use a commercial
construction project having higher engineering standards, however, all failure
criteria specified herein shall apply. Evidence that the mix has not been
correctly blended or any malfunction of the mixer or components shall constitute
failare of this test.
4.5.2.7 Blending, agg regate. Prepare a test course by covering a 96-inch
(2438 mm) wide strip 150-feet (45.72 m) long of the pulverized area with a
4-inch (101.6 mm) layer of aggregate that will pass a ~-inch sieve and be
retained on a l/2-inch sieve. Set the mixer to cut 6-inches (152.4 mm) deep,
and operate the mixer to blend the aggregate with pulverized material. Not more
than three blending passes shall be made. Remove the material from three 6-inch
(152.4 mm) deep trenches dug at 10-foot (3.948 m) intervals. Determine by
visual examination, whether the aggregate has been uniformly blended with the
soil. Evidence that the aggregate and soil have not been uniformly blended tO a
depth of 6 inches (152.4 mm) or any malfunction of the mixer shall constitute
failure of this test.
4.5.2.8 Road travel. With the tiller in the raised-travel position, drive
the mixer not less than 20 miles (32.187 Km) over paved roads at a speed not
less than 10 mph (16.093 Kmph). Then drive the mixer for not less than 10 miles
(16.093 Km) over secondary dirt roads at speeds not to exceed 10 mph
(16.093 Kmph). After these operations inspect the mixer. Inability to complete
these tests or any permanent deformation or damage to any component shall
constitute failure of this test.
4.5.2.9
Dynamic braking.
4.5.2.9.1 Transmission braking. Use the transmission to completely stop the
mixer from a forward speed of not less than 10 mph (16.093 Kmph) on a dry, level
surface. Measure the distance from the point of transmission control lever
application to the actual stop on three consecutive passes. Repeat above in the
reverse direction. Inability of the transmission to stop the mixer within 20
feet (6.096 m) in either direction shall constitute failure of this test.
4.5.2.9.2 Drive wheel braking. Use the drive wheel brakes to completely stop
the mixer from a forward speed of 12 mph (19.312K mph) and the maximum reverse
speed on a dry, level surface, inability to stop within 25 feet (7.62 m) in
either direction shall constitute failure of this test.
4.5.2.10 Parking brake. Place the mixer on a 15 percent grade and restrict
it from rolling free by use of the parking brake only. Movement of the mixer
shall constitute failure of this test.
4.5.2.11 Additive pump capacity. Operate the pump in two stages to pump
liquid asphalt through spraybar. The first stage shall be at a rate of not more
than 40 gpm (151.42 lpm) and the second stage at a rate of not less than 175 gpm
(662.4 lpm). Liquid asphalt material, grade MC-250, heated to the spraying
temperatures recommended by the manufacturer of the material shall be pumped
during this test. Inability to pump the material through the spraybar at a rate
of not more than 40 gpm (151.42 lpm), or at a rate of not less than 175 gpm
(662.4 lpm) shall constitute failure of this test.
18
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals