This is the current business in buying and selling concrete that is ready for use in erecting buildings, roads, houses, and parts of the house that needs concreting. Mostly, the mix had already been prepared in their manufacturing plants (to get the specific ratio of the materials used).
Those that have not are delivered in separate compartments. The mix is still to be tailored to the on-site requirements. (Sometimes, changes were altered due to weather conditions.)
Advantages
There are several advantages that go with concrete that’s premixed and delivered on-site by the supplier as specified by the contractor who ordered it. This is way less of a hassle than having a DIY (do it yourself) project at home and buying all the materials needed and mixing them together yourself.
Depending on the distance from plant to on-site, concrete can be mixed on-site or delivered straight to the site after having been mixed at the plant to the exact specifications of the contractor by the professionals.
Mixers
Volumetric mixers can store up almost double than the barrel mixers if you opt to mix it yourself depending on your reasons (changing weather, far from the concrete manufacturing plant, etc.). However, you would still need the expert advice (exact specifications) from the professionals themselves, usually the concrete makers at the concrete plants.
Either way, it keeps wastage to a minimum or you save more because you only use what’s needed. There is no risk of over-ordering, the results are precisely measured. Contractors can even order specialty concrete mixtures for specialty needs in concrete sites.
Some disadvantages
Unless you have timed your order and declare the time you need the concrete onsite, there might a problem on timing. The materials are batched at the plant, and mixing follows right after.
The travel time from plant to site where the concrete is needed might be critical, if there is a longer distance between these two places. (Usually, the solution is to add retarders to the mix. However, some retarders compromise the strength and durability of the concrete.)
Still on delivery, there access roads and site access that need to carry the weight of the truck and its concrete load. In order to avoid complications with authorities, some companies use smaller mixers to get to hard-to-reach access sites.
One solution to long-distance deliveries is the volumetric truck where the concrete ingredients are mixed on the truck at the job site. This eliminates travel delays, the cause of getting the premixed concrete unusable. The mixing done on-truck however is not as precise as the weighed batches.
Since site mixed concrete is volumetrically metered, the quality of the on-site mixed concrete is not on par with standard ready-mixed concrete done in the usual concrete delivery Brisbane system.
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