Ready Mix Concrete Ppt 01

READY MIX CONCRETE

INTORDUCTION Ready mix concrete which is popularly called as RMC.  The first ready mix factory which was built in 1930’s.  The consumption of cement in the form of RMC is about 5% in India, where as in developed countries it’s about 70%.  The leading RMC supplier worldwide is the mexican concrete and cement company cemex. 

Definition 

A concrete which is specially manufactured for the delivery to the costumer construction site in a freshly mixed, plastic and unhardened state.

The main ingradients are Cement Sand Coarse aggregate water  

Special ingradients

Admixtures Accelarators   Retorders  Superplastisizers  Air entraining agents 

Concept of Readymix Concrete Ready-mix concrete has cement, aggregates,

water and other ingredients, which are weighbatched weighbatche d at a centrally located plant plant.. This is then delivered to the construction site in transit mixers and can be used straight away without any further treatment. Ready Mixed Concrete is manufactured under  computer-controlled computer-cont rolled operations and transported and placed at site using sophisticated equipment and methods

Small weigh batching plant for local deliveries

TRANSIT MIXER

For ready mix concrete supply the purchaser should specify the Following a) Designated max. size of coarse aggregate Desired / max. slump at the point of b) delivery Air content (for air entrained concrete) c) d) Mix design requirement – such as cement content, max. water content & admixtures or minimum compressive strength at 28 days e) Unit weight required (for structural lightweight concrete.

Utilization of Fly ash Though the scope for utilization of fly ash in Readymix concrete is very high, the concept of fly ash as an additive to concrete is still at very initial stage and it is not popular among majority of actual users of concrete

Hurdles to set up new Plant: 

SELECTION OF AREA.

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AVAILABILITY OF WATER

properties Desired properties of hardened ready-mixed concrete include  durability  strength  water tightness  resistance to abrasion.

Applications Today, ready-mixed concrete is frequently used to construct     

highways bridges dams buildings airports

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sewer systems

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tunnels

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home foundations

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driveways

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sidewalks.

Advantages A centralised concrete batching plant can serve a wide area

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The plants are located in areas zoned for industrial use, and yet the delivery trucks can service

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Better quality concrete is produced

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Elimination of storage space for basic materials at site

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Elimination of procurement / hiring of plant and machinery

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Wastage of basic materials is avoided Time required is greatly reduced. Noise and dust pollution at site is reduced  Labor associated with production of concrete is eliminated 

Disadvantages 

TRANSPORTATION

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SITE RESTRICTION

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LIMITED SPAN BETWEEN MIXING AND GOING OFF

About ACC Concrete

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 the product, cement majors, including Associated Cement Companies, Grasim, L&T, India Cements, Priyadarshini Cements, Chettinad Cement and Madras Cements, are foraying into the RMC business

Goals: 

To determine the most economical and practical combination of readily available materials

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

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

CONCLUSION RMC is more more advantageous advantageous than site mix mix concrete  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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