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7/28/2019 Recycled Aggregates Main
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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 byfilling in void spaces and resisting compressive
stress.
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Air content
Bulk density
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Economy
Compatibility with other materials
Material properties
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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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Each and every aggregate is produced differently
Recycled Concrete
Poraver
Granulated Blast Furnace Slag
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Simple process involving breaking removing and
crushing concrete into specified size and quality
(sold at a size of 37.5mm50mm)
Reinforcing steel and other embedded items mustbe removed before the quality of the aggregate can
be produced
Removal of contaminants is achieved by
demolition, screening or air separation, andreduction of size
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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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Slag and iron are collected at the bottom of a blast
furnace when iron is processed
Slag is separated from iron and then undergoes
granulationGranules are then cooled down which creates a
non-metallic product
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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 CO2in the atmosphere.
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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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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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During the time of construction order only thecorrect amount of raw materials.
Protect materials being delivered and stored in
the site. Save valuable fittings and materials.
Any suitable substitute for aggregate should beconsidered during the construction.
Re-evaluate technical specification for materials.