31032013134235 recycled aggregate
DESCRIPTION
recycled aggregates are preferred in future concrete constructions due to extinction of natural raw materialTRANSCRIPT
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RECYCLED AGGREGATESBY:
PAKIR VARDHAN
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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.