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South Africa. Construction and Demolition . Deidre De Vos Jan-Harm Steenkamp Theo Ntwe. South Africa. Video in original ppt. Introduction. THE “SHACK” PARRADOX. Pinnacle of sustainability Conventional shack Location & Skills. Introduction. THE “SHACK” PARRADOX.

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south africa

South Africa

Construction and Demolition

Deidre De Vos

Jan-Harm Steenkamp

Theo Ntwe

south africa1
South Africa
  • Video in original ppt
introduction
Introduction

THE “SHACK” PARRADOX

  • Pinnacle of sustainability
  • Conventional shack
  • Location & Skills
introduction1
Introduction

THE “SHACK” PARRADOX

  • Unsustainable Construction and the built environment
  • Lack of tenure
  • Inadequate Shelter
  • Inadequate air quality
  • Inadequate services
  • Water and outdoor air
  • pollution
  • Man-made disasters
procedures and management
Procedures and management

The Cradle-to-grave cycle of materials

and components

separation of materials
Separation of materials

Recycling industries exist in South Africa, but differ tremendously by material type.

  • Metal recycling is the most successful.
  • Scrap metal is recycled into building sections, machinery, tools etc.
  • Wood and asphalt recycling is fairly reasonable.
  • Rubble is certainly under-recycled, particularly since we have existing best practice examples in the country.
  • Gypsum, insulation and carpet padding recycling are new markets that need stimulation to flourish.
reuse renewing and recycling
Reuse, renewing and recycling

Basic construction products used in South African

  • 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

  • Illegal land fill
  • Informal recycling
laws and regulations
Laws and regulations
  • Socio-economic considerations
  • Bio-physical considerations
  • Lack of legislation
strategies and acts
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
Case Study
  • Refurbishment project for the Construction Industry Development Board (2003)
  • The case study described the following sustainability objectives :
  • 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.
slide12

Case Study

  • Recovery of the internal face bricks as well as the run-of –the-kiln bricks( rok.’s)

Recovery rate:

  • 80% Rok.’s
  • 15% Face bricks

Other building materials:

slide13

Case Study

Environmental benefits:

  • 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
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
  • Internationally recognized concept
  • Mechanism for recycling and reusing
  • Linking industrial waste generators to companies renewing and recycling.
  • Trader / Recycler of Used and Baled Waste Paper: Port Elizabeth
future tactics1
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 tactics2
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 tactics3
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 tactics4
Future tactics

Deconstruction (Skeleton concept)

  • 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.
  • Design for deconstruction (DFD) means the design of a building and its components with intent to manage its end-of-life more efficiently.
  • The main idea is to be able to dismantle building components without demolishing them; therefore the building must be flexible.
future tactics5
Future tactics

Deconstruction Principles

  • The principles governing this are durability and adaptability.
  • Durability – the ability of the designed building and building materials to withstand all types of conditions overtime.
  • Adaptability – the ability of the building to be modified, either the interior or exterior to fit the changes of the physical environment.
future tactics6
Future tactics

Deconstruction Procedure

  • 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.
  • 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.
    • 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)
      • Portable
      • On-site assembly
      • Demountable
future tactics7
Future tactics

Deconstruction Procedure

3. Material considerations

4. Principles for achieving flexibility in buildings

5. End use scenario hierarchy of options

future tactics8
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
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