Concrete Floor Alkalinity Ph Testing
Our client was having difficulties with carpet tiles adhering to the concrete floor. We were asked to conduct to see if the carpet tiles were not sticking due to the high alkalinity (ph levels) of the concrete.
For each test point, a small sample of concrete dust was obtained. The sample was then treated with a pH dye indicator solution and then a small amount of barium sulphate was added as an activator. pH values were then read by comparing the colour of the sample to a standard
Collecting PH Sample from Concrete - Colour Shoes the PH
Concrete PH test Points
For installation of flooring on concrete the guidelines (ASTM F710) state that the pH of the concrete should be between 7 and 9. The pH values from all sample locations were very alkaline (all greater than pH 11).
We found that the alkalinity of the slab is therefore a likely cause of the failure of carpet adhesive. It is recommended that flooring installers be consulted for advice on how to address the issue