concrete slab quality requirements. who controls concrete quality polishing contractors have to...
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Concrete SlabQuality Requirements
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Who Controls Concrete Quality• Polishing contractors have to perform
work on a concrete floor slab in which they had no control over design and placement quality
• Design professionals have to be proactive and see that certain requirements are included in concrete specification
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Pre-Concreting Meeting
Polishing contractor should participate in the meeting
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Flat Subgrade• Should be
uniformly graded flat and level
• Subgrade rises and depressions can cause variations in concrete slab thickness thus causing color differences because of differential curing and drying
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Vapor Retarder• Product should comply with ASTM E 745
and have permeance of 0.01 perms after conditioning according to ASTM E 154 Section 7.1
• Installation should comply with ASTM E 1643
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Concrete Mix Design• Consistent source for materials• W/C of 0.45• 3,500 psi• Normal weight aggregates• Not air-entrained• No replacements for portland
cement
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Construction Joints and Patches• Strategically locate
construction joints to avoid mismatching segments
• Patch finish will not match surrounding surfaces
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Steel Column BaseplatesBe aware of design of concrete at steel column baseplates
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Placing• Comply with ACI standards• End of chute or tremie not
more than 6 ft above point of placement
• Monitor and control:- Concrete temperature- Water added at site
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Flatness and LevelnessSpecified Overall
ValueMinimum Local
Value
FF Floor Flatness 50 35
FL Floor Levelness 30 20
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Finishing• Specific procedures recommended• Steel trowel surface in three passes
without burning surface• Do not dust surface
with dry portland cement or sand to accelerate curing and drying
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Curing and Drying• Evaporation control • Wet-curing method
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EnvironmentalBenefits
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Environmental Benefits• Polished concrete does
not have to be removed or replaced; it can be “forever”
• Light reflective• Durable• Flooring covering products not needed• Low maintenance requirements