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The output obtained from a site mix concrete plant using a 8/12 mixer is 4 to 5 metric cubes per hour which is 30-60 metric cubes per hour in a ready mix concrete plant. Better handling and proper mixing practice will help reduce the consumption of cement by 10 – 12%.
United States weight laws under the Federal Bridge Formula (FBF) require a three-axle ready mixed concrete truck to weigh 48,000 pounds (22,000 kg) or under. This leaves only 18,000 pounds (8,200 kg) for concrete to be carried, as 30,000 pounds (14,000 kg) is the tare weight of the truck.
Some concrete suppliers offer general purpose concrete batched in a volumetric mixer as a practical alternative to ready-mix if quantities and schedules are not fully known, to eliminate waste and prevent premature stiffening of the mix. The volumetric mixer varies in capacity size up to 12 m 3 and has a production rate of around 60m 3 an hour ...
A wet mix concrete plant combines some or all of the above ingredients (including water) at a central location into a concrete mixer - that is, the concrete is mixed at a single point, and then simply agitated on the way to the jobsite to prevent setting (using agitators or ready mix trucks) or hauled to the jobsite in an open-bodied dump truck ...
Stephen invented a self-discharging motorized transit mixer that was the predecessor of the concrete mixer truck and applied for a patent in 1916. [2] However, the patent was rejected in April 1917 by the patent office because it was believed that a truck could not support the weight of a concrete mixer on top of it. [5]
A 1999 CCC Century II concrete mixer. In addition to over-the-road trucks and wheeled loaders, CCC also builds trucks for oil drilling, water well drilling, terminal tractors, and aviation fuelers. As with most American specialty truck manufacturers, the customer's choice of proprietary engines and transmissions have been available. [2]