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Green building materials

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  • 1. Green Building Materials and Techniques
  • 2. Green building
    • Focuses on increasing the efficiency of resource use –energy, water and materials.
    • While reducing impacts on human health
    • And environment during the Lifecycle, through better siting, design construction and operation.
  • 3.
    • Emphasis on:
    • Reduced energy use – Efficient and alternative sources which are less polluting
    • Reduced waste- Reutilising our industrial and agricultural wastes
  • 4.
    • “ The Environmental impact of building is often underestimated, while the perceived costs of green buildings are overestimated”
  • 5. Why eco-friendly materials?
    • Phenomenal growth in the construction industry that depends upon depletable resources.
    • Production of building materials leads to irreversible environmental impacts.
  • 6. What is Eco-friendly material ?
    • Dictionary: describes a product that has been designed to do the least possible damage to the environment
    • US EPA – EPP program defines as: “ products or services that have a lesser or reduced effect on human health and the environment when compared with competing products or services that serve the same purpose...”
  • 7. SOURCES
    • A) Renewable source – Rapidly renewable sources e.g. wood from certified forests
    • B) Reuse of Waste - Salvaged products –e.g. old plumbing, door frames
    • C) Recycled contents – agriculture/ industrial waste e.g. Firbreboard Board
  • 8. Reclaimed materials
    • Construction materials account for:
    • 420 million tonnes of material consumption (7 tonnes per person)
    • 20% of the UK’s total ecological footprint
    • 19% of the UK’s total greenhouse gas emissions
    • 30% of all UK road freight
  • 9. UK’s total greenhouse gas emissions Greenspec ® Reclaimed Materials Article - http://www.greenspec.co.uk/reclaimed-materials.php
  • 10. Why Use Reclaimed Materials
    • Substitution of reclaimed materials for new will radically reduce the environmental impact of that particular item.
    • It removes the need to extract more raw materials and it largely removes the need for processing and manufacture.
    • Transportation impacts are usually reduced too as reclaimed materials tend to be sourced locally (although not always). 
  • 11. BRE life cycle analyses comparing new with reclaimed Greenspec ® Reclaimed Materials Article - http://www.greenspec.co.uk/reclaimed-materials.php
  • 12. Greenspec ® Reclaimed Materials Article - http://www.greenspec.co.uk/reclaimed-materials.php
  • 13. Potential for reclaimed
    • Waste from construction and demolition produces a massive, virtually untapped, sustainable resource. Salvo estimate that only 1% of building materials are currently from reclaimed sources. Whereas some 5-10% of the building materials demand could potentially be met from reclaimed. (Salvo, A Reclamation Protocol, 1995).   Diverting and re-using salvaged materials from the waste stream maintains them as a high grade resource instead of down grading them by crushing or chipping.
  • 14. Embodied Energy
    • Total energy input required to produce the product including transporting them to the building site .
    • Aluminum and steel has the most embodied energy because to the high energy required to produce them. Compared to timber that requires very less energy for production.
  • 15. This shows relative carbon emissions for three common building materials. Please note that emissions data are based on metric tons (1000 Kg) of each material.
  • 16. Reduce Pollution
    • Air Pollution - Use of materials with low VOC emissions e.g. Cement Paints
    • Water Pollution – Materials that prevent leaching.
    • Land Pollution - Materials that reuse waste that would otherwise have resulted in landfill e.g. Fly ash Bricks .
  • 17. Energy Conservation
    • Materials that require less energy during construction e.g. precast slabs . Materials that help reduce the cooling loads- e.g – aerated concrete blocks.
    • Products that conserve energy – e. g. CF lamps. (compact fluorescent lamps )
    • Fixtures & equipments that help conserve water e.g. Dual flush cisterns
  • 18. Performance
    • Materials can be eco-friendly based on how they perform. Use of certain material or techniques can reduce the amount of material required.
    • Durability – The longer the life of a material the lesser it is required to replace and thus reduces the quantity required to produce.
  • 19. Advantages of GREEN Buildings vs. Conventional Buildings
    • Cost Savings (Ongoing Operating Expense Reductions)
    • Minimize Impact on Environment
    • Enhanced Health & Productivity of Occupants
    • Increased Value & Lease-Up Rates
    • Community & Social Benefits
    • Other Owner Benefits (Lender Incentives; Tax Abatements; Etc.)
  • 20. Myths Surrounding Green Buildings
    • They are too complicated
    • “We're not already building green!”
    • Over hyping benefits and performance
    • Cost Perceptions
    • Too expensive and has no ROI
    • Initial costs not recaptured in long term
    • Costs too high to warrant
  • 21. Myths Surrounding Green Buildings Performance Expectations
    • Green automatically reduce expenses
    • It costs less to build and maintain
    • More green, more operating problems
  • 22. LIMITATIONS OF GREEN BUILDING
    • Initial Cost- Some materials costs are higher
    • Funding –Some lenders will not offer loan
    • Availability of materials
    • Location
    • Time frame needed – Materials take more time
  • 23. Nanotechnologies and Green Buildings
    • A study commissioned by the nanotechnology group of the UK's Department for Environment Food and Rural Affairs (Defra) looked into the policy implications of nanotechnologies that will benefit the environment.
    • Five nanotechnology applications were subject to detailed investigation: fuel additives, solar cells, the hydrogen economy, batteries and insulation.
  • 24. Fuel additives
    • Nanoparticle additives increase the fuel efficiency of diesel engines by approximately 5% which could result in a maximum saving of 2-3 millions of tonnes (Mte) per annum of CO2 in the UK.
    • Concerns about the health impact of free nanoparticles in diesel exhaust gases.
  • 25. Solar cells
    • Nanotechnology may deliver benefits in significantly decreasing the cost of production of solar cells.
    • Conservatively, if a distributed solar generation grid met 1% of the UK's electricity demand, approximately 1.5 Mte per annum of CO2 could be saved.
    • The major barrier to this technology is the
    • incorporation of the nanotechnology into
    • the solar cell, not the nanotechnology itself.
    • Lack of skills to transfer the science base
    • into workable prototypes.
  • 26. Batteries and Supercapacitors
    • Nanotechnology may provide a remedy to the charge time problem by allowing electric vehicles to be recharged in much more quickly.
    • If low carbon electricity generation techniques are used, CO2 from private transport could be eliminated (resulting in a maximum potential saving of 64 Mte per annum)
    • or, using the current energy mix, maximum
    • savings of 42 Mte per annum of carbon
    • dioxide could be made.
    • Without nanotechnology, electric vehicles
    • are likely to remain a niche market due to
    • the issues of charge time
  • 27. Insulation
    • No easy methods for insulating solid walled buildings, which currently make up approximately one third of the UK’s housing stock.
    • Nanotechnology may provide a solution which, if an effective insulation could be found with similar properties to standard cavity insulation, could result in emission reductions equivalent to a maxim potential of 3 Mte per year.
    • Ultra thin films on windows to reduce heat loss already exist on the market. There are claims that nano-enabled windows are up to twice as efficient as required by current building standards.
    • However, industry believes that significant further insulative savings in glass maybe made instead using aerogels, which themselves are nanostructures.
  • 28. ISSE Green Products
    • The ISSE is evaluating and commissioning research via nanotechnology and reclaimed materials technologies for a solution to the increasing level of environmental damage caused by the construction industry
    • As the information and concept is commercially sensitive no information can be provided here.
  • 29.
    • http://www.nanowerk.com/spotlight/spotid=2225.php
    • http://www.greenspec.co.uk/reclaimed-materials.php