01-03-2013, 10:25 AM
Recycled Aggregates
Recycled Aggregates.pptx (Size: 1.31 MB / Downloads: 474)
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.
Why Should We Use Recycled Aggregates?
Recycled aggregates are a way of reusing materials by keeping them from being disposed into landfills
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
Production
Each and every aggregate is produced differently
Our group chose to focus on 4 main types of sustainable aggregates
Recycled Concrete
Poraver
Granulated Blast Furnace Slag
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
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.
Concrete Canoe
50% of the total amount of aggregate by weight must come from sustainable aggregates
Last week the mix design team
picked our final mix to use pelletized milk jugs and cenospheres as our recycled aggregate based
on compressive strength tests