Trucks with Cement Mixers Installed on Them Help Concreting Operations

Concrete is a homogeneous mixture of cement, sand, coarse aggregate and water that are added in predetermined and definite proportions to make concrete. This mixture is in a liquefied form which solidifies as the cement sets to form the required structure. The solid concrete takes the shape of the formwork in which it is placed and gradually gains strength till it attains its designed value or exceeds it. 

Concrete mixing is carried out in drums that have revolving components to aid in the mixing. Mixers are often mounted on trucks that are then able to carry the concrete to the spot where it needs to be placed. The working principle of a truck concrete mixer involves the processes of feeding, mixing, conveying, discharging and cleaning.  Learn the details here:

Trucks have to be able to perform all these functions, though the feeding is often done from batching plants that are programmed to add the various components in the decided ratios. Water to be added to form concrete is quite often made available from water tanks mounted on the truck, though this is strictly not necessary. The rotation direction of the mixer drum mounted on the truck, during feeding and transportation, has to remain the same. This mixing is done at a low speed of 1 to 3 revolutions per minute, as this ensures that the concrete formed is homogeneous and does not disintegrate. 

The concrete is going to be conveyed by the truck to the point where it requires to become discharged. Care should be taken up see that this period is just not very long, as being the cement setting action starts immediately water is added. Where distances are long, the mixing action uses dry materials along with the water is added close to begin discharge, and also the mixture made ready for pouring into molds or formwork.  Click this page to get the details.

The mixer drum has fins, blades, or augers that maintain the concrete mixture agitated to ensure that it doesn't set plus act to push the concrete into the drum. When it is found it necessary to discharge the concrete, the revolutions are reversed to ensure the blades or other devices act to push the concrete out from the mixer. At this time, the revolutions are increased to approximately 14 revolutions per minute.

Concrete sets quickly and does leave a residue in the mixer drum that can affect the volume of further loads. It is necessary therefore to clean the mixer drum. Water from the tank mounted on the truck is forced into the drum at high pressure and the drum rotated to rinse out the residual concrete. This water is then discharged in a way similar to discharging concrete and the truck mixer is then ready for the next load. For more related info, visit this website:  This cleaning action is not completely effective and it is often necessary after concrete work is completed to chip out any hardened concrete. Accumulation of this concrete will not affect the quality of future concrete but will over time reduce the carrying capacity of the mixer and affect production quantities.

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