Hi all-

My house is about 150 feet from the road and i have a concrete drive out to the street. Due to the dry conditions, the ground has shrunk away from the concrete underneath and a 12 by 24 inch section in a corner has broken. and dropped at least 1/2 inch. Other sections are showing signs of stress and you can see gaps under the slab at the edge along with it sounding hollow when you hit is with a hammer.

I used a company several years ago that injected a slurry under part of my drive and that part seems to be surviving the best. Should i bring them back for more injections? If i do, will have have problems with it raising up when it gets wet again?

Looking for advice on repair and prevention of further damage.


Thanks.

About to say... water it.

Milwaukees Best Light said:

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Water it. Lots.

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Yeah...I've watered the hell out of it with soaker hoses for hours and no impact. You can run a hose under it and the water pretty much disappears.

Slurry injection is the structural engineer's go-to
but big cities are seeing good results from pros using foam to lift such problems.

Of course we all are trying to avoid the elephant in the room

• this was improperly done, cost or jack-leg driven (if not horrible soils gone wild)
• needs a demo and replaced by a 5-star crew w/perfect steel & conc mix on road.specs supporting fill

I'm afraid even Quikrete DIY doesn't have a good solutions this time

Always wondered, if you foam inject, with dry clay, what happens when it starts raining again and the clay starts to swell?

Five years ago I got the City to repair the section of alley directly behind my driveway. The contractor used foam injection. It's held up perfectly.

"Yeah...I've watered the hell out of it with soaker hoses for hours and no impact. You can run a hose under it and the water pretty much disappears."
+ ref:
http://rb.gy/um9sp

It looks to me like you have a void beneath your slab. Those issue look like they are close to joints. If I had to guess, something caused the material underneath to erode out and go somewhere. That could have been due to loading and deflecting the joint which then ejects material, or you have a drainage issue that allowed material to flow out. Based on your statement that the water just disappears, you have a void under there. So not necessarily due to dry conditions. Injection to fill that void would help