Lightweight, insulating, back-ribbed CarbonCast® Architectural Cladding employs a steel reinforced Vierendeel-like truss frame attached to a thin, C-GRID®-reinforced diaphragm face. Insulating foam forms the ribs of the frame and displaces concrete to provide a complete architectural precast panel that is up to 50% lighter in weight. C-GRID carbon fiber shear trusses mechanically link the face and truss ribs to develop a rigid panel that will withstand fire, wind and rain.
- Up to 50% lighter than conventional architectural precast
- Enables reduced superstructure and foundation
- Reduced project carbon footprint
- Aesthetic flexibility
- Produced under license from AltusGroup, Inc.
The architectural precast panels can be stacked for low- and mid-rise applications.
Cost
$$-$$$
Connections are typically welded or bolted
Mix:
- Exterior wythe: architectural precast mix
- Interior wythe: EcoMix (up to 50% recycled content per design requirements)
Water-cement ratio: </=.38
Strength: 5-7,000 psi
Color: per design
ASTM E 119
Up to 3 hours
Primary reinforcement – 3/8” prestressing strand and mild steel rebar per design
Crack control – welded wire fabric or C-GRID carbon fiber mesh
Shear reinforcement – C-GRID carbon fiber mesh
Certification . . . . . . . . . . . . . . . . . PCI Factory Certification
Design. . . . . . . . . . . . . . . . . . . . . . ACI 318-95
Prestress strand . . . . . . . . . . . . . . ASTM A 416
Reinforcing steel. . . . . . . . . . . . . . ASTM A 615
Welded wire fabric . . . . . . . . . . . . ASTM A 185
Structural steel . . . . . . . . . . . . . . . ASTM A 36
Aggregate. . . . . . . . . . . . . . . . . . . ASTM C 33
Cement. . . . . . . . . . . . . . . . . . . . . ASTM C 150 Materials
Dimensional Tolerances:
Horizontal alignment:
Position of Weld Plates: ±1 in.
Varying thicknesses – interior and exterior wythes are typically 1-3/4” thick. The exterior wythe can be thickened to accommodate architectural details.
R-values – insulation thickness can be increased to meet higher R-value demands.
Insulation types – typically expanded polystyrene (EPS, white in color).
Shapes – an assortment of architectural precast elements such as cornices, bullnoses and reveals can be cast into the concrete carefully and cost-efficiently.
Embedded finishes and veneers – stone, tile and thin brick can also be used as well as simulated limestone or granite.
Panel orientation – typical orientation will be horizontal; vertical orientation is possible.
Grouted connection tubes – prefabricated plastic forms, fit into foundations and panels to facilitate connection (www.highconcreteaccessories.com)
Potential architectural precast point contributions to LEED 2009 certification:
|
Credit |
Title |
Points |
|
Sustainable Sites |
|
|
|
SSc5.1 |
Site Development, Protect or Restore Habitat |
1 |
|
SSc7.1 |
Heat Island Effect, Non-Roof |
1 |
|
Energy & Atmosphere |
|
Points |
|
EAp2 |
Minimum Energy Performance |
-- |
|
EAc1 |
Optimize Energy Performance |
1-19 |
|
Materials & Resources |
|
Points |
|
MRc4.1 |
Recycled Content, 10% (post-consumer + pre-consumer) |
1 |
|
MRc5.1 |
Regional Materials, 10% Extracted, Processed & Manufactured Region |
1 |
|
MRc5.2 |
Regional Materials, 20% Extracted, Processed & Manufactured Region |
1 |
|
Indoor Environmental Quality |
|
Points |
|
EQc3.1 |
Construction Indoor Air Quality Management Plan: During Construction |
1 |
|
Innovation & Design Process |
|
|
|
IDc1.1 |
Innovation in Design: Provide Specific Title* |
1 |
|
IDc2 |
LEED® Accredited Professional |
1 |
*Provide Specific Title: High Concrete Group encourages applications for CarbonCast carbon fiber reinforcement because it reduces cold spots and embodied energy relative to other precast concrete systems.
CarbonCast is a registered trademark of AltusGroup, Inc.
C-GRID is a registered trademark of Chomarat, N.A.
LEED is a registered trademark of the US Green Building Council.
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