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Sunday, February 05, 2012 | 3:59:48 PM

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READY MIX CONCRETE

Arya Bhangy
Ready Mix Concrete

What is Ready Mixed Concrete?

Ready Mixed Concrete (RMC) is the concrete delivered at site or into a purchaser's vehicle, in a plastic condition and requiring no further treatment before being placed in the position in which it is to set and harden. RMC was introduced in the early 1930s in the United Kingdom and has since been in usage in the west. In developed countries its usage has been over 70%. In India, the concept was introduced only in the early 1990s. And usage is around 5-6% of the total concrete requirement in the country.

As Dr Visvesvarayya was quoted saying, in the journal 'The Master Builder' (Volume 1, No. 4, July-August '99): "The Indian construction system has to get into the practice of using the maximum out of the performance that the concrete mix can give. While they start using the maximum advantage, then they will find RMC the best."

Advantages of RMC

- Structure constructed with RMC is likely to function in a more predictable manner because of known concrete strengths and uniformity of concrete maintained.

- Assured quality of raw material.

- Assured and uniform quality of required grade of concrete, even on repetition.

- Better finishing due to pumpable mix.

- Control on Water

-Cement ratio is maintained.

- Due to the highly workable and cohesive mix, less chance of segregation/lumping and consequent absence of honeycombs in the concrete.

- Lower labour and supervisory efforts.

- Better supervision of Concrete from the RMC supplier at the construction site.

- Environment friendly.

- Multi-transportation of raw materials, for concrete, eliminated.

- Quicker construction through continuous mechanized operations.

- Eliminates need for ordering and storing Cement, Sand and other aggregates at the site.

- Eliminates space constraint problems for storage.

- Timing for setting of concrete can be decided to suit site or weather requirement.

- Wastage reduced due to bulk handling.

Suppliers of RMC in Chennai

Coromandel Cements

L & T

Ramco

Suppliers of RMC Equipment

Schwing Stetter

Siemens

Ocmer Truck Mixers

Lieberr

Hyundai

Gujarat Apollo

Ajax Fiori Engineering (ORU)

Varieties of RMC

Coloured Concrete

Condensed Silica Fume Concentrate

Enhanced Concrete

Fibre reinforced Concrete

Temperature controlled Concrete

Future of RMC in India

Projected that the 5% usage will reach 45% by 2020.

Insistence on the use of RMC by all major Construction companies

Present forward integration will turn into more individual business units.

Disadvantages of RMC
- More expensive than
Site Mixed Concrete (SMC).
SMC is at least 20% cheaper.
- RMC attracts Sales Tax, as a product.
- Congestion and traffic snarls could play spoilsport.

Problems faced by the Industry

Lower level of awareness of the benefits of RMC

Acceptance of the concept

High Sales Tax

Variable Cement prices

Traffic restrictions on Transit Mixers

Shortage of trained manpower

RMC - What they say ...

" As far as the superiority of technology is concerned, no doubt , it (RMC) is one of the
best technologies, that should be adopted in all construcion activities " - Professor B Bhaskara Rao of Centre for Symbiosis of Technology Environment and Management.

"It (RMC) is an ideal solution to many of the problems we face. What is lacking is awareness.
We have to educate our engineers in the government departments. " - Kantharaju of Karnataka State Building Centre.

Text : Hemantha Kumar Pamarthy
Picture : V Ganesan

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