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Concrete Slab Quality Requirements

Concrete Slab Quality Requirements. 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

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Concrete Slab Quality Requirements

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  1. Concrete Slab Quality Requirements

  2. 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

  3. Pre-Concreting Meeting Polishing contractor should participate in the meeting

  4. 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

  5. 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

  6. 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

  7. Construction Joints and Patches • Strategically locate construction joints to avoid mismatching segments • Patch finish will not match surrounding surfaces

  8. Steel Column Baseplates Be aware of design of concrete at steel column baseplates

  9. 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

  10. Flatness and Levelness

  11. 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

  12. Curing and Drying • Evaporation control • Wet-curing method

  13. Environmental Benefits

  14. 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

  15. D+D Specifiers Series Questions WALTER SCARBOROUGH CSI CCS CCCA SCIP AIA wscarborough@hbig.us 214.491.7385 Sponsored by

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