This would be an example of an improperly prepared substrate prior to the installation of a concrete topping. Though the substrate might have looked and felt clean prior to installation of the topping, there are many factors that may act as a bond breaker thus causing failures as seen above. When removing the topping Advanced Leveling & Concrete Solutions could see that the topping had bonded to the primer, but the primer was not bonded to the existing substrate thus the subsequent failure.
To fix the existing problem first Advanced Leveling & Concrete Solutions had to remove and dispose of all the concrete topping which was 1" thick in areas. After the area had been cleaned of all material Advanced Leveling & Concrete solutions properly prepared the existing concrete slab to a minimum CSP #3 (Concrete Surface Profile) as recommended by ARDEX and the International Concrete Repair Institute for proper bonding of concrete toppings and underlayments. Considering that moisture levels were high in the existing slab Advanced Leveling & Concrete Solutions used an ARDEX Moisture control system with a #4 blastsand broadcasted into the wet system to refusal to assure proper bonding.
Once the Moisture control system had dried the recommended amount to time Advanced Leveling & Concrete Solutions poured approximately 1" of ARDEX K-15® to produce a smooth flat surface that was later finished with 2 coats of Rust-o-leum 9100 series epoxy mastic fast cure to create the desired floor finish for the homeowners work space.
Note: To keep the project as GREEN as possible all removed concrete was brought to the local concrete recycling center.