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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.


South africa

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:


South africa

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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