How do I remove carpet adhesive from concrete?
The glue used by the floor covering industry to adhere carpet to a floor is one of the most tenacious, and laborious bonds to break. If you want to burn some calories grab some knee pads and a 6 inch floor scraper (and some extra blades). Use a sweeping arch to slice the residual adhesive from the floor. Or, if possible, rent a 17 inch floor scrubber/buffer machine and ask for a couple of 36 grit sanding disc's. The sanding discs will eventually clog with glue. I've found that some handfuls of silica sand broadcast on the floor speeds the glue removal and lessens the amount of glue clogging the disc. Wear a respirator if using silica. Breathing it can cause silicosis to the lungs.