Pervious Concrete:

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CONCRETE APPLICATIONS I CIMT 210

• Pervious Concrete
• What is Pervious?
• Definition
• History
• Applications
• 2. Stormwater Management
• Benefits
• Recommended Specifications
• Hydrologic Analysis
• 3. Mix Design

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1. What is Pervious?

• DEFINITION
• (SEE VIDEO ON PERVIOUS CONCRETE)

• It allows rainfall to be captured and to
• percolate into the ground.
• It reduces stormwater runoff
• It recharges groundwater
• It supports sustainable construction

http//asusmart.com/blog/news/asu-art-museum-pervi
ous-parking-lot
http//youtube.com/watch?vG6BOJ6AFhls
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1. What is Pervious?
B. HISTORY

• Its not a new technology
• (first used in 1852)
• 2. Federal Clean Water legislation (promotes
  it.)

http//www.perviouspavement.org/?gclidCLG3wNr-so8
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1. What is Pervious?
C. APPLICATION
1. Its high porosity provides is thermally
insulating (i.e in walls of buildings) 2. It
has good acoustical properties (for sound
barrier walls).
http//www.perviouspavement.org/?gclidCLG3wNr-so8
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1. What is Pervious?
C. APPLICATION
Table . Applications for Pervious Concrete
Low-volume pavements
Residential roads, alleys, and driveways
Sidewalks and pathways
Parking areas
Low water crossings
Tennis courts
Subbase for conventional concrete pavements
Patios
Artificial reefs
Slope stabilization
Well linings
Tree grates in sidewalks
Foundations / floors for greenhouses, fish hatcheries, aquatic amusement centers, and zoos
Hydraulic structures
Swimming pool decks
Pavement edge drains
Groins and seawalls
Noise barriers
Walls (including load-bearing)
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2. STORMWATER MANAGEMENT
A. BENEFITS

• Its subbase may provide enough water
• storage capacity to eliminate the need for
• retention ponds, swales, and other
• precipitation runoff containment strategies.
• 2. Its drainage media for hydraulic structures,
• parking lots, tennis courts, and greenhouses.
• 3. It helps owners comply with EPA stormwater
• regulations

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2. STORMWATER MANAGEMENT
B. Recommended Specifications

•  1. Recommended Concrete working time is
• usually, one hour between mixing and
  placing.
• 2.Using retarders and hydration stabilizers
• can extend the working time by as much
• as 1.5 hours
•   (Density and Porosity)
• .A pavement 5 inches (125 mm) thick with
• 20 voids will be able to store 1 inch (25 mm)
• of a sustained rainstorm in its voids.
• It covers the majority of rainfall events in the
  U.S.
• 6-inch thick subbase of open-graded gravel
• increases it to as much as 3 of precipitation
•                                                   
                  

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2. STORMWATER MANAGEMENT
B. Recommended Specifications
  (Permeability)  Typical flow rates through
pervious concrete are 3 to 8 gal/ft²/min, rates
of up to 17 gal/ft²/min   (Compressive
Strength)  Compressive strengths ( 500 to 4000
psi) Typical values are about 2500 psi Drilled
cores best measures in-place strengths Compaction
differences make cast cylinders less
representative of field concrete.   (Flexural
Strength)  Flexural strength (150 psi to 550 psi
). Flexural strength is affected by compaction,
porosity, and the aggregate-to-cement (A/C)
ratio. Pervious concrete does not require the
measurement of flexural strength for design.  
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2. STORMWATER MANAGEMENT
B. Recommended Specifications
Freeze Thaw (continued) Research indicates that
entrained air in the paste dramatically improves
freeze-thaw protection   Sulfate
Resistance Aggressive chemicals in soils or
water, such as acids and sulfates, are a concern
to conventional concrete and pervious
concrete   Abrasion Resistance  Because of the
rougher surface texture and open structure of
pervious concrete, abrasion and raveling of
aggregate particles can be a problem,
particularly where snowplows are used to clear
pavements. Highways are generally not suitable
for pervious concretes. However, anecdotal
evidence indicates that pervious concrete
pavements allow snow to melt faster, requiring
less plowing.
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3. MIX DESIGN
A. STRUCTURAL DESIGN
Cementitious materials Portland Cements (ASTM C
150, C 1157) Blended cements (ASTM C 595, C
1157) Fly Ash, pozzolans (ASTM C
618) Ground-granulated blast furnace slag (ASTM
C 989)  Supplementary cementitious materials
(SCMs) Fly ash, pozzolans, and Slag These
influence concrete performance, setting time,
rate of strength development, porosity,
permeability, etc.   Silica fume, Fly ash, and
Blast furnace slag all increase durability by
decreasing permeability and cracking
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3. MIX DESIGN
A. STRUCTURAL DESIGN
Silica fume is a byproduct of silicone
production. It consists of superfine spherical
particles Used frequently for high-rise
buildings It produces concrete that exceeds
20,000 psi Silica fume can replace 5-12 cement
Fly ash is the waste byproduct of burning coal
in electrical power plantsit used to be
landfilled This material can be used to replace
5-65 of the Portland cement Blast furnace slag
is the waste byproduct of steel manufacturing. It
imparts added strength and durability to
concrete, and can replace 20-70 of the cement in
the mix.