Ready Mix Concrete - Advantages & Disadvantages

     RMC is a type of concrete, which is a mixture of Portland Cement, Water, Fine (Sand) and Coarse aggregates. It is manufactured in a cement factory or batched plants in specific proportions and transported in a Transit-mixer to the construction sites.

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RMC is eco-friendly compared to site mix concrete because mixing is done in closed chambers as it reduces the noise and air pollution.

Types of Ready-Mix-Concrete

There are three types in ready-mix concrete, and they are briefly presented below:

Transit mixed concrete

     It is also known as truck mixed concrete, in which materials are batched at a central plant and are thoroughly mixed in the truck in transition. Transit-mixing separate water from the cement and aggregates and allows the concrete to be mixed instantly before using at the job site.

Transit-mixing avoids the problems of early hardening and slump loss that result in delays in transportation. The disadvantage is the capacity of the truck is smaller than the same truck carrying central-mixed concrete.

The first RMC plant in India was set up in Pune, 1992.

 

Shrink-mixed concrete

     It is used to increase the truck's load capacity where concrete is mixed at the plant to shrink the volume of the concrete. The balance mixing of concrete is completed in the truck during transit time or at the construction site.

Central-mixed concrete

     Sometimes, the central mixed plants are referred to as wet batch plants. The concrete is batched and completely mixed in a stationary mixer at the plant site before discharging it into the truck mixers.

The advantages of central-mixed concrete are better quality control, consistency, higher production capability and reduce wear on the truck mixer drums.

 

RMC was first used for the construction of Bhakra Nangal Dam Project in Bilaspur, Himachal Pradesh.

 

Volumetric mobile mixer is also a truck that contains raw materials and water, which can be mixed on the truck at the job site. The on-truck mixing at the job site eliminates the problems of ready-mix concrete.

Advantages of Ready-Mix Concrete

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•  

  Better quality concrete

  is produced as it is made from consistent methods and in advanced equipment.
•  No need to store construction materials at the site.
•  Labour associated with the production of concrete is eliminated, thereby

  reducing labour cost.

•  Air and Noise pollution at the job site is reduced.
•  Wastage of basic materials at the site is avoided.

•  Reduce the time

  required for construction.
•  No delays in completing major projects like constructing dams, roads, bridges, tunnels, etc.
•  Economy in the use of raw materials results in conservation of natural resources.
•  

  Safe work practices

  - No disruption in the project schedules.
•  Environment-friendly.

Disadvantages of Ready-Mix Concrete

•  Requires huge

  initial investment.

•  Not suitable for small projects (less quantity of concrete is required).
•  Need an

  effective transportation system

  from the batching plant to the job site.
•  Labour should be ready at the site to cast the concrete in position without any delay to avoid slumps in the mixture.
•  Concrete has limited time and should be used within

  210 minutes

  of batching the plant. Traffic jam or breakdown of the vehicle can create a problem.

     Quality Control is very important as it has to be mixed with a proper dose of admixtures and transported to different locations. All the ingredients used for the mixture of concrete are thoroughly tested for quality and physical properties based on Indian Standard Codes. Everything is taken care of by batching plants while manufacturing the concrete mixture to produce highly durable, sustainable and premier quality for long-lasting structures.

Check Out: Types of Cement Concretes used in Construction

Technically Reviewed by Rajesh Pagadala, MS, Founder & CEO - BuildersMart. Written by Vani paspula, Content Manager.

Application of the concrete mixing plant is more and more extensive, range form rural houses to large national construction projects, we can see it everywhere. Mobile concrete batching plant is a new product to meet the market demand. The common mobile mixing plant has two model, tractor type and trailer type, the chassis of traction type mobile mixing station containing the full front and rear axle, while the chassis of trailer mobile mixing station only has the rear bridge, the front mounted on the tractor. In addition to the screw conveyor transitions and cement silo, hauling station front can move without removing the other parts. If there are detachable parts, they can be transferred with the station, so it is suitable for some close sites.

The advantages of mobile concrete batching plant are as follows: 

1. The compact structure, in the trailer hanging unit concentrated almost all processes of concrete production. 

2. The manual-machine interface is user-friendly, work performance is reliable, it can still be stable operation in a variety of harsh environment. 

3. The twin shaft compulsory mixer has high continuous operation ability, stirring trajectory is comprehensive, stirring strength is high, stirring evenly and quickly. 

4. The complete sets of equipment can be quickly transported to the construction site through the whole hanging form, and assembled on-site without debugging can be constructed. 

5. The high degree of automation, strong mobility, simple operation, good stability. 

6. The structure is firm, the space layout is compact and reasonable, and the flexibility is guaranteed while the production capacity is guaranteed. 

7. The mobile concrete batching plant occupies small area and the transfer movement is convenient, so that the amount of foundation works greatly reduced.

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