SUSTAINABILE BUILDINGS WITH PRECAST PRESTRESSED CONCRETE - PowerPoint PPT Presentation

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SUSTAINABILE BUILDINGS WITH PRECAST PRESTRESSED CONCRETE

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How can precast concrete be specified and designed into a project to the benefit ... components are most often transported and erected within 200 miles of the plant. ... – PowerPoint PPT presentation

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Title: SUSTAINABILE BUILDINGS WITH PRECAST PRESTRESSED CONCRETE


1
SUSTAINABILE BUILDINGS WITHPRECAST /
PRESTRESSED CONCRETE
2
Sustainable Buildings with Precast / Prestressed
Concrete
  • How can precast concrete be specified and
    designed into a project to the benefit of the
    environment and the projects bottom line.

3
Sustainable Precast Concrete
  • Sustainable site planning -
  • Eco-designers believe the way to sustainable
    building lies in long-life, adaptable, low-energy
    design

4
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5
High Reflectivity
  • Light colored precast reduces heat in urban areas
  • This reduces the amount of electricity for A/C,
    which reduces smog- improving urban air quality.

6
Night and Day
  • Lighting accounts for 25 of annual electricity
    usage when combined with reflective precast
    concrete, efficiency is enhanced
  • Lighting enhances security, reducing crime.

7
Cooler communities
  • Reflective precast concrete can moderate the heat
    island urban effect.
  • Improve energy use, reduce greenhouse gases,
    lower air and water pollution, and enhance
    sustainable development
  • White roofs and shade trees have proven to lower
    the need for a/c

8
Sustainable Precast Concrete
  • Safeguarding water and water efficiency - summary
  • The earths resources are best conserved if the
    service life of a building is prolonged, so the
    durability and longevity of precast concrete make
    it an ideal choice.

9
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10
Sustainable Precast Concrete
  • Energy efficiency and renewable energy
  • Optimum Energy performance
  • Renewable resources
  • Local materials
  • Environmentally friendly production practices

11
Energy Efficiency
  • The additional R-value provided by the insulation
    and the concretes thermal mass combine to
    provide a high insulating value in a relatively
    thin and durable panel.
  • Thermal mass is particularly beneficial in spring
    and fall in Northeast climate where there are
    wide fluctuations in temperatures

Exterior Wythe
Interior Wythe
Insulation
12
Energy Efficiency
  • Massive walls absorb and retain heat and this
    heat is later released not taken into
    consideration with R-Values alone.
  • Dept. of Energy (DOE) factors that influence the
    effect of thermal mass
  • Heat Absorption
  • Thermal Lag
  • Lower energy consumption

13
Energy Consumption
  • The time lag between peak heating /cooling loads
    and outside temperature peaks is greater for p/c
    walls.
  • Lower peak heating/cooling loads
  • Less overall energy to maintain same interior
    temperature.

14
Thermal Comfort
  • Humidity control in facility
  • Assisted by HVAC
  • Preventing moisture formation on interior walls

15
Sustainable Precast Concrete
  • Energy efficiency and renewable energy
  • Summary
  • Anticipating and designing for maintenance/repair
    and designing in flexibility for changes in
    usage can also extend service life.

16
Sustainable Precast Concrete
  • Conservation of materials and resources
  • Building reuse
  • Construction waste management
  • Resource Reuse
  • Recycled Content
  • Local/ regional Materials

17
Managing the environment
  • Aggregate quarries are easily re-used. While
    disruption can be intense, it is closely
    contained and temporary.
  • In a few years after closing, quarries can be
    restored to agriculture, nature reserves, parks.

18
Renewable Materials
  • 85 of Precast Concrete is made up of the
    naturally occurring materials sand and stone.
    Compared to other materials extraction requires
    low amounts of energy and they go directly into
    the finished product.

19
Local Precast Production
Precast Concrete components are most often
transported and erected within 200 miles of the
plant.
20
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21
Local Materials
  • The use of local cements, aggregates, etc.
    keeps transportation of raw materials to a
    minimum.

22
Re-usable forms
  • Steel forms are used to cast structural precast
    products. These forms have a long life span
    providing thousands of reuses.
  • Specialty shaped molds are stored for future use.

23
Reusable Forms
  • Re-use of forms reduces waste and debris at the
    job site.
  • Construction sites are cleaner and neater.

24
Controlled Environment
  • Qualified and trained personnel minimize waste
    every day at the plant
  • Grey water is often recycled into future mixes

25
Recycled Materials
  • Use of fly ash or slag is commonplace
  • Substitution of PA firelight for aggregates

26
Controlled Environment
  • Enclosures allow for the recycling of sand or
    acid used in finishing techniques

27
Sustainable Precast Concrete
  • Conservation of resources-Summary
  • Prestressing allows designers to create longer
    spans, using less material and leading to
    enhanced flexibility of buildings in their use.

28
Sustainable Precast Concrete
  • Indoor environmental quality
  • Day lighting and Views
  • Control Contaminant sources
  • Low Emitting Materials Concrete emits low or no
    VOCs

29
Indoor Air Quality
  • Total Precast System buildings breathe.
  • Using precast walls reduces the out-gassing often
    attributed to other materials.

30
Indoor Air Quality
  • Precast Insulated Walls are more energy efficient
    they lower the emissions from furnaces.
  • Precast floors / walls also provide first class
    sound proofing with typical STC 50 -55. Even
    better, precast is vermin proof eliminating the
    need for chemical treatments or inhumane traps.

31
Indoor Air Quality
  • Because of high thermal mass more energy
    efficient needing less energy to heat and cool.
  • Less VOC-emitting insulation used

32
Indoor Air Quality
  • Because precast concrete is inert it does not
    require VOC-based preservatives like wood.
  • Textured interior walls can provide aesthetic
    alternatives to VOC-emitting paints or wall board

33
Sustainable Design
  • Because precast concrete is non-combustible it
    does not require additional fire-proofing
    applications.
  • Precast structures are built to last for many,
    many years.

34
Sustainable Precast Concrete
Indoor environmental quality summary Excellent
sound and fire protection and high thermal mass
touch on every aspect of sustainable design as
well as the important aspect of increased
consideration for peoples health and safety
35
Sustainable Precast Job Sites
  • Scheduling for efficient, on-time deliveries of
    precast that minimize vehicular idling time and
    traffic congestion
  • Minimized airborne dust and debris
  • Use of modular systems minimizes construction
    waste
  • Education of field personnel to ensure QC

36
Economic Benefits
  • Competitive first costs
  • Integrated design high benefit at low cost by
    achieving synergies between disciplines and
    technologies
  • Reduce operating costs
  • Lower utility costs significantly
  • Optimize life-cycle economic performance
  • Increase building valuation
  • Decrease vacancy, improve retention
  • Reduce liability

37
Innovation and Design Process
  • Innovation in Design
  • LEED accredited professional

38
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39
For more Information
  • Call 1-800-453-4447
  • E-mail info_at_mapaprecast.org
  • Web www.mapaprecast.org
  • PCI www.pci.org
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