green building and sustainable design · pdf filegreen building and sustainable design ... for...
TRANSCRIPT
Green Building and Sustainable Design
Impacts and Challenges
TU112
Richard S. Szecsy, PhD, PE
President & CEO
Texas Aggregates and Concrete Association
www.tx-taca.org
Tuesday, January 24, 2012
AIA Credits
Hanley Wood is a Registered Provider with The American Institute of
Architects Continuing Education Systems. Credit earned on completion
of this program will be reported to CES Records for AIA members who
sign in with their AIA member ID. Electronic Certificates of Completion
for all attendees will be available 6-7 weeks post show.
This program is registered with the AIA/CES for continuing professional
education. As such, it does not include content that may be deemed or
construed to be an approval or endorsement by the AIA of any material
of construction or any method or manner of handling, using or
distributing or dealing in any material or product.
Questions related to specific materials, methods and
services will be addressed at the conclusion of this
Presentation.
1. Recognize increasing pace of concrete technology
development and its implementation within the
industry
2. Discuss applicability of various concrete
technologies to green-building systems and
sustainable design
3. Evaluate positive and negative elements from both a
concrete supply and contracting point of view
4. Identify challenges that technologies and green-
building requirements bring to the construction
process
Learning Objectives
Overview
• Green Building and Sustainable Design
• Case Examples
– High volume fly ash
– Pervious Concrete
– Reflective Concrete
– Recycled and storm water
• Issues and Challenges
Sustainable Design Philosophy
Time
FunctionDesign t RequiremenDesign S
ityustainabil
• Design Requirement
– Specified level of performance necessary
• Design Function
– Specified intent for use of the structure from the Owner
Sustainable Design Philosophy
ePerformanctRequiremenDesign
Sustainable Design Philosophy
• Performance
– Expected result from the design as measured by a
standard method
• Function
– Intended use of structure or structural element
Time
Function ePerformancS
ityustainabil
Design Philosophy
• Generally accepted design approach
• Supported by Codes and Standards
• Don’t have to exercise judgment
• Perception that it minimizes liability
ePerformanconPrescripti
Design Philosophy
Time
Functionon PrescriptiS
ityustainabil
• Is it possible to “prescribe” sustainability?
• Does a prescriptive approach create an inherent
conflict?
• How do we resolve the conflict?
Green Building & Sustainable Design
• Design and construction practices to
– Reduce or eliminate impact of buildings
on environment and occupants
• Five Broad Areas:
– Sustainable site planning
– Safeguarding water efficiency
– Indoor environmental quality
– Energy efficiency and renewable energy
– Conservation of materials, resources
Reference: US Green Building Council, www.usgbc.org, 2003
Benefits of Green Building
• Environmental benefits
– Reduce impacts of resource
consumption
• Economic benefits
– Improve the bottom line
– High benefit at low cost (?!?!?)
– Optimize life-cycle, utility costs
• Health and safety benefits
– Enhance occupant comfort, health
• Community benefits
– Reduce strain on infrastructures
Reference: US Green Building Council, www.usgbc.org, 2003
LEED® Program Participation
• System for designing, constructing, operating
and certifying “green” buildings
Energy &
Atmosphere
27%
Water
Efficiency
8%
Materials &
Resources
20%
Sustainable
Sites
22%
Indoor
Environmental
Quality
23%
Reference: US Green Building Council, www.usgbc.org, 2003
Actual LEED® Points
Category Total Points % of total
Sustainable sites 14 2 14%
Water eficiency 5 0 0%
Engery and atmosphere 17 10 59%
Materials and Resources 13 6 46%
Indoor Environmental quality 15 0 0%
Innovation 4 2 50%
LEED Professional 1 0 0%
Total 69 20 29%
Using Concrete
Ref: “Using Concrete to Maximize LEED™ Points,” Concrete International, November 1, 2002
20% Materials and Resources
• Construction Waste Management
– Recycled 50% by weight construction waste (1pt)
• Resource Reuse
– Specify salvaged matls for 5% of building matls (1pt)
• Recycled Content
– 25% of building matl. contain 40% post-industrial matl (1pt)
– +25% building matl contain 40% post-industrial matl (1pt)
• Local/Regional Materials
– Building materials extracted, or manufactured within 500 mi.
radius of project (1pt)
Recycled Equations
)(Weight Total
(%)Content IndustrialPost )(Weight MaterialContent Recycled
lbs
lbs
PriceSellingVolumeContent RecycledValueContent Recycled
($)Cost MaterialsTotal
($) ValueContent Recycled(%) teContent Ra Recycled
Reference: Concrete in Focus, Fall 2004, pg 30-34
Recycled Calculation Example
Reference: Concrete in Focus, Fall 2004, pg 30-34 and Engineering News Record, December 4, 2006
Cement Fly Ash Total
8039 $88.72 41Concrete Paving
3500 psi5.53 25% 390 130 3926
Mix # QtySelling
Price% AshDescription
Per Yard (lbs)Sack
)(Weight Total
(%)Content IndustrialPost )(Weight MaterialContent Recycled
lbs
lbs
%31.33926
%100130Content Recycled
lb
lb
Recycled Calculation Example
Cement Fly Ash Total
8039 $88.72 41Concrete Paving
3500 psi5.53 25% 390 130 3926
Mix # QtySelling
Price% AshDescription
Per Yard (lbs)Sack
PriceSellingVolumeContent RecycledValueContent Recycled
44.120$72.88$14%31.3ValueContent Recycled yds
Reference: Concrete in Focus, Fall 2004, pg 30-34 and Engineering News Record, December 4, 2006
Recycled Calculation Example
Cement Fly Ash Total
8039 $88.72 41Concrete Paving
3500 psi5.53 25% 390 130 3926
Mix # QtySelling
Price% AshDescription
Per Yard (lbs)Sack
($)Cost MaterialsTotal
($) ValueContent Recycled(%) teContent Ra Recycled
%31.352.3637$
44.120$(%) teContent Ra Recycled
Reference: Concrete in Focus, Fall 2004, pg 30-34 and Engineering News Record, December 4, 2006
What about manufactured sand?
Recycled Calculation Example
($)Cost MaterialsTotal
($) ValueContent Recycled(%) teContent Ra Recycled
%09.1952.3637$
58.694$(%) RateContent Recycled
Reference: Concrete in Focus, Fall 2004, pg 30-34 and Engineering News Record, December 4, 2006
Mix # Qty Description Sack % Ash Per Yard (lbs)
Cmt Ash Mansand Fiber Color Total
8039 41
Concrete
Paving 3500
psi
5.53 25% 390 130 1411 0 0 4035
LEED for New Construction 2.2
Bonus Points: Innovation & Design
• 4 points for innovation
– High volume fly ash?
– Water recycling?
– Self compacting concrete?
• Double dipping is allowed
Technology Example - HVFA
• What happens over 30%?
– History is not kind…
• Why not 40%, 50%, 60%?
• Equal performance
– Set time, strength, etc.
• Changes in contracting
– Finishing, curing, etc.
• Proprietary Mix Designs
Video provided by: Lattimore Materials Company, 972-221-4646 www.lattimorematerials.com
HVFA - 3 day Performance Data
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
Mix B Mix C Mix A Mix B Mix C
Av
era
ge
Co
mp
res
siv
e S
tre
ng
th (
ps
i)
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
Tim
e o
f In
itia
l S
et
(ho
urs
)
3 day
Initial Set
Lab Produced* Field Produced**
HVFA - 28 day Performance Data
4000
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
10000
Mix B Mix C Mix A Mix B Mix C
Av
era
ge
Co
mp
res
siv
e S
tre
ng
th (
ps
i)
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
Tim
e o
f In
itia
l S
et
(ho
urs
)28 day
Initial Set
Lab Produced* Field Produced**
HVFA - Performance Data (Class C)
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
2
3
7
28
56
5 sack
6 sack7 sack
Co
mp
ress
ive s
tren
gth
(p
si)
Age
(day
s)
HVFA - Performance Data (Class F)
HVFA Results – Azure Tower
Pervious Concrete
• No fines, porous
• Mono-sized
• %15 to 35% voids
• 8 to 20 gal/min/ft2
• 2000 to 4000 psi?
• Fixed proportions?
Video provided by: http://www.chargerconcrete.com/perviousconcrete.htm, August 2004
Pervious Concrete
• No fines, porous
• Mono-sized
• %15 to 35% voids
• 8 to 20 gal/min/ft2
• 2000 to 4000 psi?
• Fixed proportions?
Video provided by: www.judimedozablogspot.com, January 19, 2007
Reflective Concrete…Cool Pavements
• Higher reflectivity reduces air
temperatures
– 0.1 increase 10oF decrease
– Heat island effect
• Solar Reflective Index (SRI)
– ASTM E1980
• “Albedo” is unit of measurement
– ASTM C1549
• When are they measured?
Reflective Concrete…Cool Pavements
• Time and expense of testing
• Function of available materials
– Test panels are critical
– No historical data
– Beware the “this combination worked
on the last job…”
• What if it does not work?
– Contract liabilities?
• Sunset provisions in Contract
Innovation: Self Compacting Technology
• Placement without
segregation
• Non-segregating
• Free flowing
• Not a new concrete!
• Energy reduction???
Video provided by: Lattimore Materials Company, 972-221-4646 www.lattimorematerials.com
Recycled Water and Stormwater
• The problem we all have…
• …we are at zero discharge
• Why would a specification
not support its use?
• Batch panel controls
• Document each load
Green Cement
• Based on emissions from
cement
• Requires contractor/supplier
certification/verification
• More limited/specialty a
source material…
– more expensive it could become
– greater potential concrete
expense
“…A cement kiln
that has met the
emission standard
of 1.7 lb of NOx
per ton of clinker
released into the
atmosphere…”
Opportunity: Proprietary Mix Designs
• Prescriptive vs. Performance
• Let the best technology win
• Performance basis?
– w/cm vs permeability, etc.
• Commodity to engineered…
• National focus, NRMCA
Issues and Challenges
• Our industry does not
like change
• Green Building is Architect
and Owner Driven
– Industry giving input?
• Industry Communication?
– Engineers
– Contractors
– Testing Labs
Issues and Challenges: Engineers
• Green Building = Performance
• What performance is needed?
– Verification of performance
– Do your homework
• Be explicit, not implicit!
– Set time
– What strength at what day?
• Must see the mix design…why?
Issues and Challenges: Architects
• Often don’t understand own
specification
• Material experience is rarely
first hand, based on last
major problem…
• What is the metric for
performance?
• Cost awareness is essential!
Issues and Challenges: Contractors
• “Any change is a bad change”
– Changes in placing
– Changes in finishing
• Someone else is the expert
• $/ft2 can be the deal breaker
• Performance is too good?
• Contradictions?
– Remove the Environmental fee?!?
Issues and Challenges: Testing Labs
• Verify performance for owner
– Based on job specs (explicit!)
– NOT based on speculation
or assumption
• New concrete and old
assumptions = problems
• Mix design?
• When to include in process
Forward Thinking
• This is not an industry fad!
• Leadership within industry
• Where is the resistance?
• Industry must get involved!
• There are hidden gems
– 1st mover advantage
– Proprietary mix designs
– Concrete based on performance
– Best technology wins
Richard S. Szecsy, PhD, PE President & CEO
Texas Aggregates and Concrete Association
www.tx-taca.org
512-451-5100 phone
214-202-1379 cell
This concludes the American Institute of Architects
Continuing Education Systems Program.
Any Questions?