Recycled aggregates

2. Recycling is the act of processing the used material for
use in creating new product.
Usage of natural aggregate is becoming intense.
Recycled aggregates can replace natural aggregate.
Recycled aggregate are obtained from construction and
demolition debris.

3. What are recycled aggregates ?
• Recycled aggregates are the aggregates produced from the
processing of previously used construction materials such as
concrete or masonry.
• Recycled aggregates consists of hard, graduated fragments
of inert mineral materials, including sand, gravel, crushed
stone, slag, rock dust, or powder.

4. Why recycled aggregates ?
• Due to rapid growth in population and urbanization, the
natural resources are depleting.
• High cost of good quality crushed aggregates, as compared to
Recycled aggregates.
• Shortage of dumping sites has resulted in sharp increase in
transport and disposal costs.
• An enormous increase in the quantity of waste materials and
the shortage of dumping sites.

5. Sources of recycled aggregates ?
• Construction and demolished waste generated due to natural
disasters, for future development the old buildings are
replaced by new ones, and war inflicted damages.
• Crushing of Portland concrete pavement
• Tested specimens from laboratory.
• Concrete from ready mix concrete plants and precasting units.
• Worn out rail ballast.

6. RECYCLING PROCESS

7. Buildings and
pavements
Rip and break up
Load and transport to
crushing plant
Crush/Size
Screening and
washing
Stockpile
Reuse

8. Diesel Pile – Driving Hammer
Rhino – horn – tooth – ripper – equipped Hydraulic
Excavator
Roll – off Container

9. Load into Primary Crusher
Screening Plant Washing Plant

10. Stockpile

11. Natural Aggregate Recycled Aggregate

14. Features
Texture
Quality
Density
Workability
Strength

15. Concrete kerb Building blocks

16. Paving blocks
Backfill material

17. 
• Light weight
• Minimum environmental impacts
• Saving in energy
• Job opportunities
• Sustainability
• Market is wide

18. 
• Strength is low
• Lack of suitable laws and guidelines
• Lack of specifications and standards
• Lack of experience
• Inefficient supply
• Lack of information

19. 1. A new building of 14 floors is constructed in Osaka, Japan

20. 2. A new high school is constructed in Sorumsand, outside the
city of Oslo, Norway in 2001.

21. • Recycling and reuse is an appropriate solution.
• Use of recycled aggregates prove to be valuable.
• There is a need for modifying codes, specification
• The subject of use of recycled aggregates in India should be
given importance
• Use of recycled aggregate as a replacement of natural coarse
aggregate provides environmental friendly