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Column covers conceal structural columns and may completely surround them on ground level. Typically one-story units, column covers extend between floors or spandrels. In thicknesses of 2" or greater, column covers are most often non-loadbearing. Reveals, articulation, decorative accents, mix design(s) available to meet design requirements.
Overview
Applications
Column covers are typically non-loadbearing, but may be adapted to support covers on floors above or adjacent spandrels.
Cost: $$-$$$$
Technical Overview
Connections
Connections are typically welded or bolted
Concrete
Mix: architectural face mix; structural back mix with EcoMix® (up to 50% supplementary cementitious materials recycled content, per design requirements)
Water-cement ratio: <.38
Strength: 7-9,000 psi
Color: per Architect requirements
Specifications:
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.
Options
Varying thicknesses – interior and exterior wythes are typically 1-3/4” thick. The exterior wythe can be thickened to accommodate architectural details.
Shapes – an assortment of architectural 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.
Prefinished interior wythe – a steel-trowel treatment during manufacturing imparts a smooth, durable, surface ready for paint or wallcovering and is ideal for applications such as dormitories and apartments.
Grouted connection tubes – prefabricated plastic forms, fit into foundations and panels to facilitate connection (uat.highconcreteaccessories.com)
LEED
Potential precast point contributions to LEED 2009 certification:
|
Credit |
|
Potential Point Contributions |
|
Sustainable Sites |
|
|
|
SS Credit 5.1 |
Site Development, Protect or Restore Habitat |
1 |
|
Materials & Resources |
|
|
|
MR Credit 4.1 |
Recycled Content, 10% (post-consumer + pre-consumer) |
1 |
|
MR Credit 5.1 |
Regional Materials, 10% Extracted, Processed & Manufactured Region |
1 |
|
MR Credit 5.2 |
Regional Materials, 20% Extracted, Processed & Manufactured Region |
1 |
|
Indoor Environmental Quality |
|
|
|
EQc3.1 |
Construction Indoor Air Quality Management Plan: During Construction |
1 |
|
Innovation & Design Process |
|
|
|
ID Credit 1.1 |
Innovation in Design: Provide Specific Title |
1 |
|
ID Credit 2 |
LEED Accredited Professional |
1 |
LEED is a registered trademark of the US Green Building Council.
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