Finishing of Floors for an Industrial General Contractor in Illinois

Wednesday, October 31, 2018

If you saw last week’s post about the large-scale concrete project we have been working on, you’ll remember that the second phase of the job called for finishing the floors we had poured at the mill in north central Illinois. 

After the concrete cured, we got to work with our power trowels and began the polishing process.  For those not familiar with the polished concrete process, it involves a series of passes with a diamond grinder using different grit diamond pads on each pass.  A concrete densifier (or hardener) is added during the process to actually make the concrete stronger.  There are several advantages to concrete polishing vs. epoxy floors or urethane cement floors:

  • Durability – there is no coating on the floor that will fail. 
  • Easy to clean – the sealed concrete doesn’t allow for dust, dirt, & other contaminants to hide
  • Non-slip – polished concrete floors meet the OSHA requirements for friction levels
  • Safety – the light reflectivity makes the work space brighter
  • Cost effective – power trowel polishing can grind up to 10,000 sf of floor in a single shift

Our client’s specifications for a finished polished floor were: 

Aggregate Exposure Class B 85-95% Fine aggregate

5 –15 % Blend of Cement Fines and Coarse Aggregate.  As defined by the Concrete Polishing Council & Council of the American Society of Concrete Contractors

Finished Gloss Level 4


Images of objects being reflected have a sharp and crisp appearance as would be seen in a near mirror like reflection.

1.)  Reflective Clarity Reading:  Not less than 70 according to ASTM D5767 prior to the application of sealers.

2.)  Haze Index: Less than 10

For a nice professional & decorative touch, we stained the company logo into the floor in a couple different areas.  This project was a challenge, but a very rewarding one!  And both our client & their client were very pleased with the outcome.