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RECYCLED AGGREGATES BY: PAKIR VARDHAN

31032013134235 Recycled Aggregate

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recycled aggregates are preferred in future concrete constructions due to extinction of natural raw material

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Page 1: 31032013134235 Recycled Aggregate

RECYCLED AGGREGATESBY:

PAKIR VARDHAN

Page 2: 31032013134235 Recycled Aggregate

WHAT ARE AGGREGATES? Aggregates are used in the making of concrete Concrete is composed of water, cement paste,

coarse aggregates, fine aggregates, and admixtures Aggregates help the strength of the concrete by

filling in void spaces and resisting compressive stress.

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WHY SHOULD WE USE RECYCLED AGGREGATES?

Reuse and conserve natural resources They are more cost efficient than most regular

aggregates Recycled aggregates lower the amount of energy

and raw materials used for the production of it Use of RA in concrete and asphalt showed

comparable performance over virgin aggregates.

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PROPERTIES OF FRESH RECYCLED AGGREGATE CONCRETE Air content

Bulk density

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VIABLE TECHNOLOGY ON CONSTRUCTION WASTE RECYCLING Economy Compatibility with other materials Material properties

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DIFFERENT WASTES IN A CONSTRUCTION SITE Brick

Concrete

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Ferrous Metal

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Masonry

Non Ferrous Metal

Paper And Cardboard

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Plastic

Timber

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PRODUCTION Each and every aggregate is produced differently

Recycled ConcretePoraverGranulated Blast Furnace Slag

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RECYCLED CONCRETE PRODUCTION Simple process involving breaking removing and

crushing concrete into specified size and quality (sold at a size of 37.5mm – 50mm)

Reinforcing steel and other embedded items must be removed before the quality of the aggregate can be produced

Removal of contaminants is achieved by demolition, screening or air separation, and reduction of size

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PORAVER PRODUCTION Post consumer glass is collected through municipal

box programs Glass is sent to a plant where grinded up to a

powder, mixed with water and expanding agents, and is put into a furnace

Cooks at 900 degrees Celsius to produce the tiny lightweight glass balls

The finished product of Poraver

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GROUND GRANULATED BLAST FURNACE SLAG PRODUCTION Slag and iron are collected at the bottom of a blast

furnace when iron is processed Slag is separated from iron and then undergoes

granulation Granules are then cooled down which creates a

non-metallic product

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ADVANTAGES OF RECYCLED AGGREGATES Recycled Concrete

Provides sustainability Reduces the amount of material that would be

delivered to a landfill Any metals that can be removed from the aggregate can

be disposed properly Reduces the need of virgin aggregates to be created Absorbs large amount of carbon dioxide while being

crushed into smaller sizes, reduces the amount of CO2 in the atmosphere.

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ADVANTAGES OF RECYCLED AGGREGATES Granulated Blast Furnace Slag

Uses 90% less energy in production than the production of Portland cement

Emission of carbon dioxide is almost negligible Provides improved strength and durability Reduces permeability Improves workability

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BARRIERS IN PROMOTING USE OF RECYCLED MATERIALS Lack of appropriately located recycling facilities. Absence of appropriate technology. Lack of awareness Resistance to change Lack of experience Inadequate codes, specifications and standards Lower and variable quality

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CONCLUSION During the time of construction order only

the correct amount of raw materials. Protect materials being delivered and

stored in the site. Save valuable fittings and materials. Any suitable substitute for aggregate

should be considered during the construction. Re-evaluate technical specification for

materials.