Mud jacking is a common method used for lifting any sunken or unevenly settled concrete. Grout is pumped through the concrete lifting it up from below. This is often termed as “slab jacking” or “pressure grouting” as well. Holes with a diameter of 1- 1 5/8” are drilled through the sunken concrete slab to help in the lift. Afterward, a combination of water and a dense and finely crushed limestone aggregate is forced into the holes. This combination, also known as Portland cement, fills the voids under the slab due to water erosion or soil compaction and then the lifting process can begin.
Even though this procedure is less disturbing than having to replace the entire slabs, both the processes have a lengthy cure period. And taking some precautions during the process is necessary to avoid damage to your foundation as well as to the workers. Since the process needs to apply pressure, make sure to avoid a blowout as it can be difficult to clean afterward.
Also, typical hazards during technical failure of the lifting equipment need to be avoided in order to avoid delay in the project and to protect the workers from being crushed by the loading or lifting equipment.
Simultaneously, try to avoid skin contact and eye contact with cement dust or wet cement in order to prevent any burns or irritation in the skin and eye. Wearing alkali-resistant gloves and covering yourself with eye protection, long sleeves, full-length pants, and waterproof boots is a good precaution for that.