What is Mudjacking?
Mudjacking is the process of pumping a mixture of Portland cement, sandy loam and water into the area that has dropped. The mixture can be adjusted according to what is happening to the concrete area. Mudjacking can be done on things such as: Sidewalks that have dropped, Roads that have settled, Parking Lots that are ponding water, Loading Docks, Warehouses, Driveways, Pool Decks and many others issues.
What Causes Concrete to Drop?
There are several reasons why concrete can drop or settle. Soil erosion, lack of compaction, poor drainage, water leaks, etc. are just some of the reasons. Also, the ground just settles over time so if the slab is several years old, it may be the natural progression of things.
How Does the Process Work?
Holes are drilled into the concrete slabs that have dropped. Then, the cement slurry mix is then pumped into these holes. This fills the gaps under the slab. As the gaps are filled, it then becomes pressurized and raises the slab hydraulically to the height desired. After all voids are filled and the job is clean, the holes are then patched with a cement mixture.
What Are the Costs and Advantages?
Mudjacking is typically half the cost of replacement. Another advantage is the concrete is able to be used within hours of work being completed as to replacement is out of commission for several days.
What Material Content is used for Mudjacking?
Mudjacking material shall consist of a mixture of select sifted sandy loam with Portland cement and water.
Typically, nine bags of Portland cement are used to one cubic yard of soil (loam) to reduce the percentage of shrinkage. This also makes it less permeable to free water and acts as a hardening agent. The consistency will be at least 600psi.
Water will be added to mixture to achieve the right consistency in order to void fill and\or lift. Lifting requires a thicker mixture as compared to just void filling.
Mixtures can be adjusted at any time, as the engineer deems necessary.