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Ready Mix Concrete Ppt
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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