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INTORDUCTION

Ready mix concrete which is popularly called asRMC.

The first ready mix factory which was built in1930s.

The consumption of cement in the form of RMCis about 5% in India, where as in developedcountries its about 70%.

The leading RMC supplier worldwide is themexican concrete and cement company cemex.

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Definition

A concrete which is speciallymanufactured for the delivery to the

costumer construction site in a freshlymixed, plastic and unhardened state.

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The main ingradients are

Cement

SandCoarse aggregate

water

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Special ingradients

Admixtures

Accelarators Retorders

Superplastisizers Air entraining agents

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Concept of Readymix Concrete

Ready-mix concrete has cement, aggregates,water and other ingredients, which areweighbatched at a centrally located plant.This is then delivered to the constructionsite in transit mixers and can be used straightaway without any further treatment.

Ready Mixed Concrete is manufactured under

computer-controlled operations and transportedand placed at site using sophisticated equipmentand methods

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Small weigh batching plant forlocal deliveries

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TRANSIT MIXER

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For ready mix concrete supply

the purchaser should specify the

Following

a) Designated max. size of coarse aggregateb) Desired / max. slump at the point of

delivery

c) Air content (for air entrained concrete)d) Mix design requirement such as cement

content, max. water content & admixtures

or minimum compressive strength at 28days

e) Unit weight required (for structurallightweight concrete.

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Utilization of Fly ash

Though the scope for utilization of fly ashin Readymix concrete

is very high, the concept of fly ash as anadditive to concreteis still at very initial stage and it is not

popular among majorityof actual users of concrete

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Hurdles to set up new Plant:

SELECTION OF AREA.

AVAILABILITY OF WATER

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properties

Desired properties of hardened ready-mixedconcrete include

durability

strength water tightness

resistance to abrasion.

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ApplicationsToday, ready-mixed concrete is

frequently used to construct

highways bridges dams buildings airports

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sewer systems

tunnels home foundations

driveways sidewalks.

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Advantages

A centralised concrete batchingplant can serve a wide area

The plants are located in areas zonedfor industrial use, and yet the delivery

trucks can service residential districtsor inner cities

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Better quality concrete isproduced

Elimination of storage space for

basic materials at siteElimination of procurement /

hiring of plant and machinery

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Wastage of basic materials isavoided

Time required is greatly reduced.Noise and dust pollution at site is

reduced Labor associated with productionof concrete is eliminated

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Disadvantages

TRANSPORTATION

SITE RESTRICTION

LIMITED SPAN BETWEEN MIXING AND GOINGOFF

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About ACC Concrete

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ACC Concrete - a wide range

High Strength Concrete High Performance Concrete Self-leveling Concrete

Self-compacting Concrete Coloured Concrete Concrete made with binary and ternary blends

of cements

Early strength Concrete Fibre reinforced Concrete

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Anticipating huge potential for theproduct, cement majors, including

Associated Cement Companies, Grasim,L&T, India Cements, PriyadarshiniCements, Chettinad Cement and Madras

Cements, are foraying into the RMCbusiness

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Goals:

To determine the most economical and practicalcombination of readily available materials

To produce a concrete that will meetrequirements under specific conditions of use.

The majority of concrete used for agriculturalapplications is supplied by ready-mix producers

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CONCLUSION

RMC is more advantageous than site mixconcrete

Easier addition of admixture Flexibility in mix design

RMC which produces uniform, consistent

and quality assured concrete

Faster and speedier construction

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