How To Raise a Concrete Driveway Apron

Make four 1 1/2-inch-diameter holes spaced 6 inches apart in a line through the slab into the soil beneath the section of apron you wish to raise, using a hammer drill and masonry bit. Place the holes so that they run from the highest point of the area you need to raise to the lowest point.

Run a hose through the hole in the apron located at its highest point until it reaches the level of the soil beneath the concrete. Do not push the hose into the soil itself, as the dirt will clog the end of the hose. You only want the host to rest on the soil's surface. Connect the other end of the hose to a mudjacking pump.

Mix a batch of filler material for the mudjacking machine in a wheelbarrow with a hoe. Pour into the wheelbarrow one part Portland cement, one part flyash, and two parts sand. Add an expander additive to keep shrinkage to a minimum. Follow the additive manufacturer's instructions for the amount to use for the amount of filler you're making, as it differs by brand. Fold water into the dry filler mix until the filler is the consistency of a thick batter. Fill the mudjacking machine with the filler after mixing, using a spade to transport the material.

Set the mudjacking machine to pump the filler material at 10 PSI, and start the machine. Watch as the slab begins to rise with the material spreading out beneath the slab. Stop the machine when you've reached the desired level for the first hole and switch the hose to the next in line. Fill that hole until the second hole section is level with the first, then continue along the way. Raise each section until the entire apron is at the height you desire. If you require more of the apron raised, drill additional holes down the line.

Switch the mudjacking machine off and pull the hose free from the final hole.

Mix a batch of patching mortar with one part Portland cement to three parts sand in a bucket. Add water until the mortar is the consistency of peanut butter. Fill the holes in the apron with the mortar until level with the surrounding concrete surface, using a trowel to pack the holes tightly. Wait three weeks for the filler material beneath the apron to dry before using the apron regularly.