jamshid armaghani, ph.d., p.e. global ... - ibracon.org.br · performance and challenges without...
TRANSCRIPT
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Jamshid Armaghani, Ph.D., P.E.
Global Sustainable Solutions
IBRACON 2011 – Florianopolis
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Pervious Concrete
Concrete mix with little or no sand
Made with different aggregate sizes &
types
Mix can be produced with different colors
Void ratio from 15% to 25%, depending on
required density and strength.
Sustainable and “Green” material
compared to asphalt surfaces.
First used in Florida in late 1970s.
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Different Aggregate Sizes and Types
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….and Colors
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Sustainable & Green
Saves on land otherwise used for detention pond.
Maximizes permeable surface in a development
May filters surface water from pollutants
Cooler than asphalt and conventional concrete - contributes to less energy for cooling
Light color - save on lighting energy
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Applications
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Parking
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Application
Sidewalks
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Streets
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Base Layer Beneath
PCC Pavement
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Edge Drain
Filter Fabric
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Materials & Mix Design
Mix design depends on required strength
and drainability.
Use approximately 360 kg/m3 of Cementitious material including 50/50 Cement/slag or 75/25 Cement/Fly Ash
W/Cm = 0.30
May add some sand back into mix for stiffer layer
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Pavement Design Consideration
Edge confinement
Stiff support
Design thickness based on truck traffic
Minimum 15 cm of base
Not less than 18 cm pavement for streets
Not less than 10 cm for parking and sidewalks
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Design Guides
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Construction
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Curing With Plastic Sheets is not “Green”
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Use of Lithium Cure
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Performance and Challenges
Without proper design, and quality control of materials and construction - can have unpredictable drainability and stiffness.
Aggregate raveling can be a major problem with poor mix design and construction.
The issue of surface clogging has been a concern to potential specifiers and owners.
Balling of inside the truck mixer
Not much information on its structural capacity
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Raveling Problem
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Testing & Development
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Courtesy of Dr. Hassani
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Raveling Inhibitor
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Prevent Raveling along the edge
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Testing & Specifications
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Contractor Training & Certification