Removing carpet glue from concrete
We're replacing the commercial loop carpet that was glued down to the concrete floor in our basement with carpet tiles. I've searched the internet for ideas for getting up the old carpet glue and found a jillion responses that range from scraping after softening with hot water or heat gun or, conversely, scraping it off after freezing by placing dry ice over it (making it brittle), scraping with a floor machine, using soy/citrus solvents, yada, yada, yada. When I relocated my office, the contractor rented one of the floor scrapers to remove carpet glue before installing vinyl tile and they went through 3 machines before they decided the floor was going to have to do as is so I'm kind of leary about renting one of those machines. OTOH, I've got about 1600 sf of concrete that I need to clean up before I can put the carpet tiles down. Does anyone have significant experience with this stuff that can give me a recommendation as to how to go about removing this stuff?