result in segregation and non-uniformity of materials and very poor control of the concrete. Once a batching plant is erected in such a location, it is difficult to improve conditions. Experience has demonstrated that the most uniform concrete is produced when the Concrete batching plant is favored by adequate space for the maintenance of large stockpiles of materials.
concrete batching plantWhen draining aggregates at the batch plant site, provide provisions for disposal of drainage water and for clear-cut separation of drained from undrained materials. Keep materials of different sources/classes or gradations separated. Sometimes, timber bulkheads are erected to save space in the Producer’s storage yard. These are satisfactory if built properly. Erect the weighing bins and hoppers on firm foundations to avoid settlement, which might affect
the accuracy of the equipment.
At concrete batching sites, check that there is enough material in stockpiles to complete the concrete pour or the rate of aggregate delivery is sufficient to keep up with the required rate of concrete delivery. When using a collecting hopper for handling more than one size aggregate, empty entirely of one size material before placing another size material within. Check to assure that the conveyor and reflector chute used with the collecting hopper are clear of any accumulated materials. The discharge chute for deflecting the material into the various storage compartments must center over the correct compartment while it is charged with aggregate.
The concrete batching process aims to load a concrete truck with the required quantity of concrete meeting the customer’s specifications. Sands and aggregates are automatically weighed and cement and water are added to produce concrete with the correct strength and slump specification. The measured weight includes the water present in the material. Therefore, variation in moisture can result in errors in the amount of dry material in the mix. Moisture in sand is the major problem as sand can contain up to 15 per cent moisture.
Online measurement of moisture in raw materials can avoid these problems. The moisture result can be used to calculate the correct wet weight of material for the optimum mix. The correct water addition can also be calculated, by taking into account the water already present in the raw materials. For best results the measurement technology must measure moisture directly in a bin and rapidly provide moisture data to the batching control system.

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