The drum in cement mixer trucks revolves at a rate of 1-3 revolutions per minute, but it can go faster. PTO (engine power is converted to hydraulic power, which is subsequently turned to mechanical energy to revolve the drum) or an auxiliary engine powers the drum. A large concrete truck can usually transport 6-9 cubic meters of concrete. To prevent exceeding the road's limit axle loads, most concrete cement mixer trucks run in an 84 configuration (2 steers, 2 drive) or a 64 configuration (1 steer, 2 drive). On projects with limited access, small cement mixer trucks with capacities of up to 2.5 cubic meters are used. They are smaller and taller, lighter, and have two axle sets.
A conventional cement mixer truck in action can be loaded with dry components and water, with mixing taking place during transportation, or it can be loaded with mixed concrete. The drum rotates as the truck is traveling to keep the concrete stirred and therefore liquid until it is ready for delivery to the appropriate site. A multi-purpose blade is housed within the drum. The spiral-shaped blade runs the length of the drum's interior. The blade agitates and mixes the concrete as it rotates into the drum's base. When the drum is rotated in the opposite direction, towards the aperture, the spiral operates as an Archimedes screw.
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