Transcript Microsoft Powerpoint Presentation South Africa adjustedx

South Africa
Construction and
Demolition
Deidre De Vos
Jan-Harm Steenkamp
Theo Ntwe
South Africa
 Video
in original ppt
Introduction
• Pinnacle of
sustainability
• Conventional shack
• Location & Skills
Introduction
Unsustainable Construction and the
built environment
Lack of tenure
Inadequate Shelter
Inadequate air quality
Inadequate services
Water and outdoor air
pollution
• Man-made disasters
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Procedures and management
• Extraction
1
• Manufacturing
•Value Addition – Processing, Packaging, Transportation
3
• New Development – Planning , Design, Site
activity
• Operation and maintenance
4
• Renovation & Remodeling – Repair,
Replacement
• Building Removal
5
• Demolition – Building destruction, Waste
transportation, Waste Disposal
Energy
• Construction
Environmental
Financial Implications
Physical resources
Waste
2
•Mining & Quarrying – Extraction, Processing,
Transportation
Separation of materials
Recycling industries exist in South Africa, but
differ tremendously by material type.
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Metal recycling is the most successful.
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Scrap metal is recycled into building sections, machinery,
tools etc.
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Wood and asphalt recycling is fairly reasonable.
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Rubble is certainly under-recycled, particularly since we
have existing best practice examples in the country.
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Gypsum, insulation and carpet padding recycling are new
markets that need stimulation to flourish.
Reuse, renewing and
recycling
Basic construction products used in South African
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Concrete
masonry walling
windows and doors (including glass and door leafs)
steel products
sanitary ware
ceiling boards
timber,
electrical fittings,
floor finishes,
wall finishes, and insulation materials.
Current status in South Africa
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Illegal land fill
Informal recycling
Laws and regulations
 Socio-economic
considerations
 Bio-physical considerations
 Lack of legislation
Strategies and acts
 Agenda
21 for sustainable development
 NEMA - National Environmental
Management Act
 Sub- divided in other acts, for example
:
 National Environmental Management:
Waste Act, Act 59 of 2008
 National Strategy for Sustainable
Development (NSSD).
Case Study
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Refurbishment project for the Construction
Industry Development Board (2003)
 The
case study described the following
sustainability objectives :
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National empowerment initiatives;
Procurement methods that underpin value,
transparency and partnership;
Health and safety, including HIV/Aids awareness; and
Environmental objectives, including design for flexibility
and comfort, materials recycling and energy
conservation.
Case Study
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Recovery of the internal face bricks as well as
the run-of –the-kiln bricks( rok.’s)
Recovery rate:
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80% Rok.’s
15% Face bricks
Other building materials:
Material
Quantity
Used value(R)
New value(R)
Doors
30
1800.00
3600.00
Partitioning
Boards
200
8000.00
19 200.00
Tiles, wall
120 sq.m.
2400.00
8400.00
Case Study
Environmental benefits:
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Saves energy
CO2 emissions are reduced
Consumption of raw materials are reduced
Landfill dumping's are reduced
Case study shows significance of deconstruction
design
Future tactics
National Waste Management Strategy
Implementation (SA-May 2000)
 Waste
– resource exchange
 i.e. construction and demolition waste,
electronics and equipment, rubber, leather
and timber.
Definition - Industrial Waste Exchange
1. Internationally recognized concept
2. Mechanism for recycling and reusing
3. Linking industrial waste generators to companies
renewing and recycling.
• Trader / Recycler of Used and Baled Waste Paper:
Port Elizabeth
Future tactics
Problems with strategy
- limits to the system
- lack of skills
3 Different approaches
1. Industrial Ecology
2. Industrial Ecosystems
3. Waste minimization clubs
Future tactics
 Industrial
Ecology - exchange of materials
between different industrial sectors where
the 'waste' output of one industry
becomes the 'feedstock' of another.
 Industrial Ecosystems - refer to situations in
which a number of different companies,
usually in close proximity to each other,
exchange various 'waste' outputs.
Future tactics
 Waste
minimization clubs ( NL 1990) Waste minimization involves investigating
all methods of reducing material/utility
use at source and improving process
efficiency, thereby reducing emissions to
the environment and saving money.
 SA
Western cape – Savings of 8milion per
annum.
 The South African Industrial Waste
Exchange – 0.16 and 1.26%
Future tactics
Deconstruction (Skeleton concept)
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Deconstruction of buildings is the main proposed
strategy to curb the idea of demolition for future
construction of buildings, to enable better re-use and
recycling of materials.
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Design for deconstruction (DFD) means the design of
a building and its components with intent to manage
its end-of-life more efficiently.
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The main idea is to be able to dismantle building
components without demolishing them; therefore the
building must be flexible.
Future tactics
Deconstruction Principles
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The principles governing this are durability
and adaptability.
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Durability – the ability of the designed building
and building materials to withstand all types
of conditions overtime.
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Adaptability – the ability of the building to be
modified, either the interior or exterior to fit
the changes of the physical environment.
Future tactics
Deconstruction Procedure
1.
Selecting the team of designers – the decisions and
design of the building determines the retrieve ability of
the building components for re-use or recycling.
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Design of the building – former designs of buildings were
built as eternal structures, meaning that if it needed to be
re-modified it produced more waste or no option was
available but to demolish the building.
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Open buildings (permanent core) – the building structure does
not stay in a single state for more than a few years or decades,
it is continually changed by activities such as remodeling, repair,
expansions and maintenance. These activities alter the
building’s exterior, interior or both.
Modular buildings (industrially produced)
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Portable
On-site assembly
Demountable
Future tactics
Deconstruction Procedure
3. Material considerations
4. Principles for achieving flexibility in buildings
5. End use scenario hierarchy of options
Future tactics
 Promoting
and enhancing industrial
waste exchange in South Africa
 public-private-partnerships
 South
African Cleaner Production centers
 trading platforms
 Linking businesses
 funding mechanisms