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Most of the old school mud jackers use large (2") holes and excessive pressure because they are pumping 'mud' of unknown consistency and properties. Modern techniques call for use of ag lime (sometimes written as aglime which is pulverized lime stone) is pulverized lime stone or possibly Calcium hydroxide which is cheap, available in a known screen and has the soil stabilizing properties of lime.
Concrete can be raised with a water aglime mix with only 5PSI in a 1" or even smaller hole. This low pressure greatly reduces the risk of causing damage. The trick is that of mixing a quick sand mud.
The mud used operates on a principal similar to the problems with mud originating from volcanic ash deposits - stable piles abruptly change to flowing material once the water content goes past a point - suddenly turning from a stable pile of ash into a dangerous flow. In the case of mud jacking, we want the flowing material to lose just a little water and become stable.
So by using aglime to lift, we get some amount of stabilization of soil from the lime and a consistent mud.
Some people will add other things, but the cost:benefit seems questionable.
Good building techniques will use AB3 or road base( class 3 aggregate base) which is limestone with all smaller sizes including fines. Unfortunately, many builders cut corners when ever they can. This leaves remediation work.
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