#Project Highlights

6

Test Points

Successful Diagnosis of Problem

#Methodology

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

Test Location

Test Location

Collecting PH Sample from Concrete - Colour Shoes the PH

Collecting PH Sample from Concrete - Colour Shoes the PH

Concrete PH test Points

Concrete PH test Points

#Results

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