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

CementSandCoarse aggregatewater

Special ingradientsAdmixtures Accelarators Retorders Superplastisizers Air entraining agents

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

water   and   other   ingredients,   which   are weighbatched   at a   centrally located   plant.This is   then  delivered   to the   construction site in transit mixers and can be used straightaway without any further treatment.

Ready Mixed Concrete is manufactured under computer-controlled 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 supplythe purchaser should specify theFollowinga) Designated max. size of coarse aggregateb) Desired / max. slump at the point of

deliveryc) Air content (for air entrained concrete)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.

AVAILABILITY OF WATER

propertiesDesired properties of hardened ready-mixed

concrete include durability strength water tightness resistance to abrasion.

ApplicationsToday, ready-mixed concrete is frequently used to construct

highways bridges dams buildings airports

sewer systems tunnels home foundations driveways sidewalks.

AdvantagesA centralised concrete batching plant can serve a wide area

The plants are located in areas zoned for industrial use, and yet the delivery trucks can service residential districts or inner cities

Better quality concrete is produced

Elimination of storage space for basic materials at site

Elimination of procurement / hiring of plant and machinery

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

DisadvantagesTRANSPORTATION

SITE RESTRICTION

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

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

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

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

CONCLUSION RMC is more advantageous than site

mix concrete Easier addition of admixture Flexibility in mix design RMC which produces uniform, consistent

and quality assured concrete Faster and speedier construction