• Construction andDemolition (C&D) Waste Management - Overview
• C&D Waste – Regulation, Beneficial Reuse of C&D Waste Materials.
3.
Definition
• Construction andDemolition Waste (C&D Waste) is defined as the
waste comprising of building materials, debris and rubble resulting
from construction, remodeling, repair and demolition of any civil
structure.
Construction and demolition(C&D) waste
typically consists
A mix of materials like
• Concrete
• Wood
• Metals
• Plastics
• Gypsum (drywall),
• Bricks
• Glass
• Asphalt, and various other building materials.
This waste is generated from various construction, renovation, repair, and demolition
activities.
6.
In India C&Dwaste has two components:
Major components
• Cement concrete
• Bricks
• Cement plaster
• Steel (from RCC, door/window frames, roofing , support, railings of staircase etc.)
• Rubble
• Stone (marble, granite, sand stone)
• Timber/wood (especially demolition of old buildings)
Minor components
Conduits (iron, plastic)
Pipes (GI, iron, plastic)
Electrical fixtures (copper/ aluminum wiring
Electrical fixtures (copper/ aluminum wiring, wooden baton, switches, wire insulation)
Panels (wooden, laminated)
Others (glazed tiles, glass panes)
Reasons For Increaseof Construction &
Demolition Waste
• Many old buildings, concrete pavements, bridges and other structures
have overcome their age and limit of use due to structural deterioration
beyond repairs and need to be demolished
• New construction for better economic growth
• Structures are turned into debris resulting from natural disasters like
earthquake, cyclone and floods etc
12.
Reduction of Waste
•Ensuring materials are ordered on an “as needed” basis to prevent
over supply to site;
• Minimize the creation of excessive scrap waste on site;
• Ensuring correct storage and handling of construction materials to
minimize generation of damaged materials/waste;
• Ensuring correct sequencing of operations and assigning individual
responsibility
13.
Construction Waste Recycling
Whenconsidering a recyclable material, three major areas need to be
taken in to account are:
• Economy
• Compatibility with other materials
• Material properties
2
Construction & Demolition(C&D) Waste:
Definition
Solid Waste resulting
from:
Solid Waste resulting from:
construction, remodeling,
repair, renovation or
demolition of Structures
land clearing activities
trenching or de-silting of
storm water drains
Concrete & bricks rubble and other
masonry materials
non-hazardous insulation, glass
wall coverings, plaster, dry wall plastics, paper, gypsum boards, electrical
wiring
roofing, waterproofing material and other
roof coverings
soils, any type of vegetation,
Asphalt, pavement land clearing debris
plumbing fixtures, Rock
wood (including painted, treated and
coated wood and wood products)
24.
Actitvities of C&Dprocessing
• Collection from designated locations
• On-call C&D Waste Collection Services
• Operational call centre / helpline
• Transportation of C&D waste from the Designated Collection Points to
the processing site
• Own/ Hired Trucks for transportation
• Weighment on electronic Weigh-bridge which shall be recorded on
CCTV camera to maintain transperancy
• Segregation of C&D Waste
• Screening through grizzly
• Wet Processing/dry processing
• Recovery of aggregates to produce Ready Mix Concrete
(RMC
• Brick Dust and Granular Sub-base is sold as building
material
• Pavement block, kerb. Stone, concrete blocks, bricks
•Secondary C&D
Waste Collection
• Transportation
• Processing
• Selling Recycled
Material
25.
Process
Re-circulated water isused as a medium for separation. For
make-up water, treated sewage water is proposed to be used
Machinery capable of segregating sand from
mixed C&D Waste
Grizzly
Vibro
Screens
Evo Wash
Thickener
etc.
Technology
wet processing machinery has been sourced
from Multinational company having its
presence in India called ‘CDE Asia’
6
WET PROCESSING OF C&D WASTE
Feed reception
• Removaland sizing of oversized materials
• Detection/ removal of metals, plastics, rugs, wood
• Feeding of material into the hopper, with an intial Screen of 200
mm
Separation of Concrete and bricks
• Hand separation of concrete blocks over 200mm in size and
stacking them separately.
Size reduction using impact crusher.
• Size reduction of concrete Blocks and mixed C&D using crushers,
depending upon end use.
Processing of C&D Waste
28.
Feed Conveyor
• Feedingof material into the hopper,
• Collection of crushed material
• Feeding material to prograde/rinsing station.
Screening
• Addition of water to improve quality & to retrieve fine particles
• Material is sent to the Log washer to separate light contaminants
(wood & plastic)
Washing & Contamination Removal
• Rinsing & resizing screens used to size aggregates
• Clean and dry aggregates are sized and stockpiled into bays
Processing of C&D Waste
29.
Fines Recovery
• Washedsand is recovered which is free from any silt,
• Size of washed sand is maintained at -3 mm to +75 microns
•Water Treatment
• -75 micron material is passed to Aqua Cycle Thickener
• Specifically chosen flocculant is added to it in controlled quantities
• Formation of condensed sludge
• Recycling of clean water
•Filter Press
• Filter press squeezes water from sludge
• Filter cakes of up to 80% dry solids are dropped into bay as final waste
• This can be used for brick making/ landscaping, etc
Processing of C&D Waste
30.
Further size reductionis done with the help of
processing machines
Segregated Bigger size concrete boulders as
well as mixed concrete are broken with the
help of rock breaker
Over sized Screened material is collected in
the hand sorting section where bricks and
concrete are separated
Collected C&D waste is first screened through
a +200 mm to conduct resizing
11
DRY PROCESSING OF
C&D WASTE
Rubble Master Compact Recyclers are the
compact class for C&D Processing;
they Produce High Quality Cubic
Value grains from Construction
Debris
The Machine has been appreciated by the
residents for its dust suppression and
noise reduction cover system
31.
PILES RECEIVED FROMDMRC
PROCESSING VIA ROCK BREAKING MACHINE
SEMI PROCESSED
CONCRETE BLOCKS
PROCESSING OF PILES
Concrete Blocks
Mixedconcrete and brick base is converted into Granular Sub
Base (GSB) which is used for making Concrete Blocks
By use of egg laying machine, concrete
blocks of following sizes is made.
Brick 1: 400mm X 200mmX 200mm
Brick 2: 400mm X 150mm X 200 mm
Brick 3: 400mm X 100 mm X 200 mm
Brick 4: 400 mm X 150 mm X 185
mm
Concrete Blocks produced meets the strength and
dimensional specifications prescribed in IS 2185 (non load
bearing concrete Blocks)
35.
Economics of settingup a C&D Plant
Under Indian condition cost of setting up a 500
tons per day C&D plant is Rs 180 million (3 million
USD)
• Operating and capital related cost for operating a 500 TPD,
C&D processing plant is Rs 420/t where as from product sale
we are able to recover about Rs 120/t.
Cost of Scientific landfilling is about Rs 650/t
• As compared to Scientific land filling (Rs 650/t) processing of
C&D waste at additional cost Rs 300/t is a more preferred
option.
• Cost of collection of C&D waste is about RS 350/t, where as on
MSW about Rs 1000/t is spent.
36.
Construction Applications ofC&D
source :aggregain.wrap.org.uk
Probable application where recycled and secondary aggregates can be used in a variety of
construction application
No Application
1 Concrete Road construction
2 Bituminous road construction
3 Hydraulically bond
road construction
4 Ground Improvement
5 Earthwork embankments
6 Earthwork cuttings
7 Shallow Foundation
8 Deep Foundation
9 Utilities : New trenches
10 Utilities: reinstatements
11 Sub-Structure
12 Concrete Structures
13 Industrial Buildings
14 Residential Buildings
