Mudjacking is the process of pumping a water, crushed limestone and portland mixture under a concrete slab in order to lift it. This mixture is called slurry. The exact ingredients vary from company to company, and from job to job. Mudjackers & Concrete Repair uses ground limestone, portland cement and water; some companies use soil instead of limestone. Mudjacking can be the solution to many homeowners? concrete problems, including raising fallen driveways, sidewalks, steps, patios, and pool decks. Industrial and commercial applications include raising warehouse floors, curbs and parking lots.