SUSTAINABILE BUILDINGS WITH PRECAST PRESTRESSED CONCRETE

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SUSTAINABILE BUILDINGS WITHPRECAST /
PRESTRESSED CONCRETE
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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.

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Sustainable Precast Concrete

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

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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.

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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.

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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

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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.

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Sustainable Precast Concrete

• Energy efficiency and renewable energy
• Optimum Energy performance
• Renewable resources
• Local materials
• Environmentally friendly production practices

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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
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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

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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.

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Thermal Comfort

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

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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.

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Sustainable Precast Concrete

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

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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.

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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.

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Local Precast Production
Precast Concrete components are most often
transported and erected within 200 miles of the
plant.
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Local Materials

• The use of local cements, aggregates, etc.
  keeps transportation of raw materials to a
  minimum.

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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.

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Reusable Forms

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

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Controlled Environment

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

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Recycled Materials

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

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Controlled Environment

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

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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.

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Sustainable Precast Concrete

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

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Indoor Air Quality

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

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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.

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Indoor Air Quality

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

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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

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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.

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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
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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

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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

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Innovation and Design Process

• Innovation in Design
• LEED accredited professional

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For more Information

• Call 1-800-453-4447
• E-mail info_at_mapaprecast.org
• Web www.mapaprecast.org
• PCI www.pci.org