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Concrete is porous by nature, absorbs water and moisture, and then freeze/thaw makes it worse.
Two different applications:
Horizontal should be a "soft" mix.
Whatever is moving underneath will continue such as roots or ground heave.
Control of further water infiltration would be the main goal.
Traffic or other load is upon the concrete.
Vertical should be a "hard" mix.
Load bearing to replace the original material.
Must have enough penetration to reinforce the original material but remain soft enough to expand at the same rate.
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Meanwhile other things are still happening.
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