This is a step by step demonstration of how a sunken slab of concrete is raised. This is a mudjacking demonstration. Mudjacking is one option available for raising settled concrete for half the cost of replacement. The other option is polyurethane concrete lifting. Both methods take hours, not days, eliminating the need to tear out good, settled concrete and possibly causing damage to landscaping in the process. Quick, inexpensive, and green! Concrete raising is the cost-effective solution for you!