A brief description on construction demolition waste utilization.

1. APPLICATION OF CONSTRUCTION
DEMOLITION WASTE
BY:
AKSHAY R MANOHAR
CCT
NMAMIT-NITTE

2. Demolition and

3. INDRODUCTION:
• Construction waste consists of unwanted
material produced directly or incidentally by the
construction or industries. This includes building
materials such as insulation, nails, electrical
wiring, and rebar, as well as waste originating
from site preparation such as dredging materials,
tree stumps, and rubble.
• Construction waste may contain lead, asbestos,
or other hazardous substances must be removed.

4. • Much building waste is made up of materials such
as bricks, concrete and wood damaged or unused
for various reasons during construction.
Observational research has shown that this can
be as high as 10 to 15% of the materials that go
into a building, a much higher percentage than
the 2.5-5% usually assumed by quantity
surveyors and the construction industry. Since
considerable variability exists between
construction sites, there is much opportunity for
reducing this waste.
Conti....

5. Conti....
• At the end of a building’s life, demolition
generates large amounts of materials that can be
reused or recycled, principally wood, concrete
and other types of masonry, and drywall.
• Rather than demolish an entire building, consider
“deconstructing” all or part of the structure.
Deconstruction is the orderly dismantling building
components for reuse or recycling.

6. Diverting construction and demolition
materials from landfills.
• The good news is that many construction and
demolition (C&D) materials are highly
reusable or recyclable. The bad news is that
many of these materials are still going to
landfills. Like other recycling efforts, there are
more management options for C&D debris
that isn't mixed with other waste, so it's
important to separate reusable or recyclable
materials from other debris when possible.

7. Materials Separation
• Containers for material recycling must be set up
on site and clearly labelled. Construction
personnel must be trained in material sorting
policy, and bins must be monitored periodically
to prevent waste mixing as a result of crews or
passersby throwing trash into the bins.
• Some materials will require bins or storage that
protect from rain. Other bins may be locked to
prevent tampering.

8. Dumping and separation.

9. Dumping and separation.

10. Materials that can generally has
various application after recycling
include the following:
• Aluminium siding;
• architectural antiques;
• asphalt shingles;
• brick/masonry;
• carpet;
• carpet pad;
• concrete;

11. • concrete painted with lead-based paint;
• gas pipe/metal pipe;
• porcelain plumbing fixtures;
• PVC pipe;
• site clearance vegetative woody debris;
• steel - structural or rebar;
• untreated lumber and other wood;
• vinyl siding; and
• wallboard/drywall (gypsum).
Conti....

12. Lumber(wood logs)
• Can be used for used later as fire blocking,
spacers in header construction, etc.
• sawdust for use in compost piles or around
gardens.

13. Recycle lumber(wood log).

14. Drywall
• Drywall is the principal wall material used in the United
States for interior purposes. It is made of a sheet of gypsum
covered on both sides with a paper facing and a
paperboard backing. Drywall can be recycled into new
products.
• Drywall scraps can be placed in the interior wall cavities
during new construction.
• Gunite Support: Gunite is concrete sprayed on at high
pressure. Cutoff pieces of new construction drywall can be
used as forms to support gunite as it is being sprayed. A
swimming pool construction company uses new cutoffs for
this purpose, in sizes from 4 x 2 ft to 4 x10 ft, and thickness
of 1/2 to 3/8 in. The pieces are then discarded.

15. sheet of gypsum.

16. Masonry
• During construction, collect, stack and cover brick
and other masonry materials to prevent soiling or
loss.
• Salvage usable bricks, blocks, slate shingles, tile
and other masonry materials from remodeling
and construction. Store for future jobs or divert
to salvage operations.
• Good quality used concrete (also known as
urbanite) can also be used as brick or block for
landscaping walls and foundations for small
buildings.

17. Bricks separated.

18. Metals and Appliances
• During remodeling, separate metal radiators,
grates, piping, aluminum siding, and old
appliances for salvage or recycling.
• During construction, separate metals for
recycling, including copper piping, wire and
flashing; aluminum siding, flashing and
guttering; iron and steel banding from
bundles, nails and fasteners, galvanized
flashing and roofing, and rebar;

19. Metals recycle.

20. Cardboard and Paper
• Separate cardboard waste, bundle, and store
in a dry place. Recycle through Ecology Action.
• Can be used for recycled paper making and
packaging goods.

21. Cardboard and Paper recycle.

22. Paints, Stains, Solvents and Sealants
• Donate unused portions to Habitat for
Humanity ReStore. They accept any quantity
of white latex paint and full gallons of other
paints.
• Any other unused materials should be taken
to a hazardous waste collection facility.

23. Paints, Stains, Solvents and Sealants
recycle.

24. Miscellaneous
• Branches and trees from brush clearing can be
stored separately and chipped at the city’s landfill
facility, or a chipper can be used on site to create
landscaping mulch.
• Old nickel cadmium batteries from portable
power tools should be disposed of at a hazardous
waste collection facility.
• Cabinets, light fixtures, bathtubs, sinks, mortar
mix, hardware, nails, screws and plumbing fittings
and supplies are all accepted by Habitat for
Humanity.

25. Case studies:
• Fletcher Insulation: recycling glass into insulation.
• CSR Gyprock™ take-back scheme for gypsum
board product.
• PIPA recycling PVC pipes into new product.
• Eastern Metropolitan Regional Council: wood is
too good to waste.
• Recycling power poles into high-value timber
products.
• Waverley Council: recycled glass in roads.
• Recycling waffle pod waste.

26. Case study: Waverley Council: recycled
glass in roads: Australia
• There is an estimated 75 000 tonnes of
crushed glass fines in New South Wales.
• This material is destined for landfill unless an
alternative use can be found.
• In the concrete industry, glass powder can be
used alternate to natural sand. This can save
them $2.25 million.

27. Recycling residential asphalt shingles
in Wisconsin
• Benefits of shingle recycling
• Recycling shingles has many benefits, especially when
the price of oil and virgin asphalt is high.
• Highway engineers have investigated use of shingles
that are recycled into an additive for hot mix asphalt to
build or repair roads.
• Recycling also saves landfill space and uses less energy
than using virgin materials.
• Asphalt shingles contain asphalt cement "binder" and
mineral aggregate, which are useful for asphalt hot mix
pavement applications if proportioned well.

28. Recycling residential asphalt shingles
in Wisconsin

29. Using wood waste from a construction site
for erosion control and soil amendment
• Unpainted and untreated wood that is chipped or
shredded can be used for erosion control,
landscaping, trail surfaces and soil amendment.
• Limitations:
• Placement of wood within an area designated as
a floodplain should be limited to thin layers for
landscaping and trail surfaces.
• Improper use of wood chips and sawdust can
damage surface and groundwater quality.

30. Using wood waste from a construction
site for erosion control.

31. Concrete Recycling and Disposal
• Broken-up pieces of sidewalk or used concrete
paving stones can be used to build new paths and
walkways around your home and yard.
• Smaller pieces of concrete are used as gravel for
new construction projects.
• Crushed recycled concrete can also be used as the
dry aggregate for brand new concrete if it is free
of contaminants. Also, concrete pavements can be
broken in place and used as a base layer for
an asphalt pavement through a process
called rubblization(creating a base for new
roadways)

32. Broken-up pieces: beneficiary use
on ruptured road.

33. • Larger pieces of crushed concrete can be used
as riprap revetments, which are "a very
effective and popular method of controlling
streambank erosion.
• Also for creating a base for new roadways.
Conti....

34. riprap revetments.

36. References:
• Current practices and applications in
construction and demolition debris recycling:
by Edward L. von Stein and George M. Savage.
• Construction Waste Recycling: Sustainable
Sources: 20 years of online Green Building
information.
• http://www.epa.gov/lead/pubs/nlic.htm
• http://dhfs.wisconsin.gov/lead/