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Ready mix concrete is a cement mixture which has been pre-mixed in a batch plant as per the necessary proportions. After mixing, it is taken to the work site by using trucks which have mounted mixers on them. The concrete batch can be mixed to the exact proportions required for the job on hand and all batches can be made precisely the same.
This mode of concrete mixing was first started in the 30's and has developed steadily ever considering.
There are many good reasons why ready mix concrete is preferred to on site mixing. The site may be cramped due to the nature of the terrain plus the machinery, material and employees. A cement mixing plant on site may hamper smooth progress of the work. The downside is that it reduces room for the Engineers to maneuver, considering that in sure situations different types of cement mixes may be required. Also if there is a holdup in the concrete pour, then the mounted mixer trucks will back up top to disruptions and a host of technical difficulties.
The cement mix, as per the customer's requirements, is delivered to the site, freshly mixed in a unhardened state.
In the standard method of concrete mixing, the individual components, Portland cement, sand, gravel or crushed stones and water are mixed in the desired proportions on site. Even so the ready mix concrete is usually purchased by the customer by volume, measured in cubic meters.
Because the setting time of cement is an important element in the pour, the time taken for the ready mix concrete to arrive at the site must be estimated and additives, to enhance the time interval before pouring, must be added. However by using computer control over the functions and by using sophisticated instruments, technical difficulties can be overcome.
Once the technical details have been sorted out, the customer can be sure of a standardized product sent promptly at his work site.
Advantages of Ready Mix Concrete
By using a centralized ready mix plant, the trucks can deliver the cement batches to a bigger area, even in extremely remote places.
Batch plants can be located in industrial zones and from here providey can be made to residential areas.
The quality of ready mix concrete will be better. It will have higher compressive strength and use less water per batch.
It eliminates the need for onsite storage. The delivery of the concrete is timed as per the onsite requirement.
The contractor does not need to incur capital costs on plant and machinery for making cement. Wastage is less compared to onsite plants.
Labor costs are less.
Time required per batch is greatly reduced. This will save work costs.
Drawbacks OF Ready MIx Concrete
The travel time from the central batching plant to the site is critical, especially over long distances. The longer the length, more the operating cost and this has to be factored in. Additional road traffic will be generated. Due to the heavy load access roads should be able to handle this load.
The pouring time or going-off time is usually ten minutes. Components have to be precisely added to take care of the time lag.
Ready Mix concrete has gained popularity and is used in large tasks all around the world. Due to the precise mix proportions, quality control becomes easier and this is one of the major benefits. via
