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|  MIL-T-52896B(ME)
contracting officer. Approval of the first article will not relieve the contractor of his obligation to
furnish truck-mounted mixers conforming to this specification.
3.3 Mixer construction.
3.3.1 General. The mixer shall meet the following physical characteristics:
Minimum materials carrying capacity
- Cement
- 63 cubic feet
- Sand
- 128 cubic feet
- Water
- 400 gallons
- Aggregate
- 182 cubic feet
Each material shall be carried in a separate compartment.
3.3.2 Performance. The mixer shall be capable of continuously proportioning and mixing
quality concrete at a rate of 1 cubic yard per 2-1/2 to 4 minutes, depending on mix design.
3.3.3 Bins and tanks. The bins and tanks shall have the capacities specified in 3.3.1. The
sand and aggregate bins shall have open tops and shall be capable of being charged by front end
loaders or overhead bins. The sand and cement bins shall each be equipped with a pneumatic
vibrator to assure continuous flow of materials. The cement bins shall be of the close-top type. A
tarpaulin of sufficient size to cover the sand and aggregate bins shall be provided. Tiedown points
of the bin and the tarpaulin shall be provided. The sand and aggregate bins shall be covered with
screens to keep oversize rocks from entering the bins and mixing area.
3.3.4 Quick loading cement hopper. A hopper shall be provided to fit over the standard
opening in the top of the cement bin. The hopper shall be provided with a vibrating screen and
hinged cover. The cover shall cover the entire hopper opening. The hinged cover shall be
provided with a circular opening to accept an elephant-trunk from an overhead bin. The opening
shall be provided with a hand operable, removable cover.
3.3.5 Water system. Water shall be supplied by a 400 U.S. gallon mounted tank(s). The
tank(s) shall be coated on the inside with corrosion-resistant material in accordance with the
manufacturer's standard practice. A water fill cap secured to the tank(s) by a chain shall be
provided for each fill opening. The inside diameter of the fill port shall not be less than 2 inches
and the fill port shall be labeled "Water". A water level gage of the sight tube type, graduated in
U.S. gallons, shall be provided and this gauge shall be mounted or protected in a manner which
prevents breakage. A water pump shall be provided with the water system. A washout hose shall
be provided to clean the mixing auger and other critical areas. A water control valve calibrated
in U.S. gallons shall be provided to control the amount of water being added to the mix.
3.3.6 Mixing system. Mixing of the concrete shall be by an auger in a reinforced rubber
chute. The auger shall be equipped with replaceable wear plates. The mixing auger shall be
powered. A system shall be provided to raise and lower the mixing chute. The mixing chute shall
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