[Joe Jakuboeski]

Hello I am new here and hope I am posting properly and thanks in advance for any help or suggestions. As you can see, the concrete section has lifted up causing a tripping hazard. The rise is at least 3/4 inch including the expansion joint. I’m trying to find out my options, from complete replacement of the portion or (my preference, if do-able, cutting out the 3” border and replacing with a sloped inlay patch)

. TIA.

 

[Steve2444]

Is it that that slab raised?

Or the other sunk?

Mud jacking for the slab that sunk would be one way.

 

[Bud9051]

Are you in cold country with a significant frost depth or down south with expansive clay? In either case you may have to address the cause of the problem.

Bud

 

[Nealtw]

Mud or foam jacking is where i would start.
SLABJACK, Mudjack, Slabjacking, Mudjacking, Concrete Lifting, Concrete Raising, Concrete Leveling - YouTube

Foam Raises Concrete That Weighs Thousands Of Pounds | Tech Insider - YouTube

 

[joed]

Two options that I would consider.
1, mud jacking the low slab.
2. Grind the high slab. You can rent a powerful grinder from Home depot.

https://www.homedepot.ca/en/home/tool-and-vehicle-rental/p.concrete-floor-grinder.09015.html

 

[LMHmedchem]

2. Grind the high slab. You can rent a powerful grinder from Home depot.

This is what the city does to the sidewalks around here. We have city planted trees on every street between the sidewalk and street. The tree roots eventually raise the adjacent concrete slabs of the sidewalk. If the slab is only raised and not cracked they grind down the raised part to a slope that is level with the adjacent slabs.

I do think you need to get to the bottom of what is happening. Are the slabs sinking or raising or both? Have you contacted whoever poured the concrete in the first place? Perhaps the subsurface wasn't dug out or compacted enough.

If you don't identify and address the source problem you could fix the current issue only to have it reoccur.

LMHmedchem

 

[Joe Jakuboeski]

Is it that that slab raised?

Or the other sunk?

Mud jacking for the slab that sunk would be one way.

Pretty sure it’s raised.

 

[Joe Jakuboeski]

This is what the city does to the sidewalks around here. We have city planted trees on every street between the sidewalk and street. The tree roots eventually raise the adjacent concrete slabs of the sidewalk. If the slab is only raised and not cracked they grind down the raised part to a slope that is level with the adjacent slabs.

I do think you need to get to the bottom of what is happening. Are the slabs sinking or raising or both? Have you contacted whoever poured the concrete in the first place? Perhaps the subsurface wasn't dug out or compacted enough.

If you don't identify and address the source problem you could fix the current issue only to have it reoccur.

LMHmedchem

Thank you. It’s 17 years old. I’m 95% certain that this particular one is raised.

 

[Joe Jakuboeski]

Are you in cold country with a significant frost depth or down south with expansive clay? In either case you may have to address the cause of the problem.

Bud

NJ. Can get very cold.

 

[Half-fast eddie]

Remove the expansion strip. Grind the high part to be flush. Install urethane caulk.

 

[Nealtw]

SMITH SPS10 Sidewalk Grinding "Wheels-up" Instructions - YouTube

 

[kwikfishron]

One thing to consider when grinding is that it will expose the aggregate and it will be obvious what was done and will never match what you have now, so if esthetics are important to you then grinding wouldn't be a good choice.

 

[SPS-1]

Cutting and pouring is something you can do yourself, but likely would have to rent a wet-saw (no big deal)

Grinding is something you could do yourself, but would have to buy blade and mask. I agree with kwik that it probably would not look as good.

Slabjacking would possibly look best. You would still have the filled holes in the slab to see. That is something you need to hire a pro for. Its not a big job for them, but you would likely be hitting their minimum order pricing. Probably they could make it flush, but their are certain ways the slab wants to move --- to a pro its obvious, but I ain't one of those pros.

 

[Nealtw]

NJ. Can get very cold.

If you set down 2 2x4 blocks about 15 feet apart, and have 2 people pull a string across them, you may be able to see if one sank or if the other has raised.
No I have not done this , just an idea.

 

[Racinmason]

I hate it when they leave the trim boards on. It turns that patio into a dozen separate pours and no bond within the pads. If they would’ve left those off and it cracked there, the aggregate can keep that pad from lifting. The only way to make that good is to lift the sunken piece.

 

[Jeekinz]

I would jack the adjacent slab. Grinding is going to leave an eyesore and will never blend in with the surrounding concrete.

 

[FM3]

At first I thought jack up the adjacent slab, but there is an adjacent slab next to the adjacent slab, so then the adjacent slab would probably be higher than the other adjacent slab.

What's under the concrete? Gravel? Dirt? Maybe dig out under the raised slab until it's even again.

 

[Matt1963]

You can mud jack or cut it out and do a blending piece with rebar pins. I would cut out a 12 inch wide piece.

I could blend it but then you have a new line that doesn't match the other ones so I would go around and score new line 12 inches away on all the other panels

 

[Jeekinz]

At first I thought jack up the adjacent slab, but there is an adjacent slab next to the adjacent slab, so then the adjacent slab would probably be higher than the other adjacent slab.

What's under the concrete? Gravel? Dirt? Maybe dig out under the raised slab until it's even again.

To me it looks like that slab sank, probably settling from the pool install. The curved inside edge sank, raising it would not raise the whole section, just that edge.

 

[Joe Jakuboeski]

I am the original poster and here is an update. First of all, you guys are best and thank you from the bottom of my heart. Things are a little tougher for me now (72), but I still like to do things myself, if I can. Turns out, I got my hands on a diamond concrete grinding wheel, wet the site down, got my protective **** on and went to work. 45 minute, job. COMPLETELY 100% LEVEL. COULDN'T TRIP IF YOU TRIED. Thank you. Thank you. You made an old guy happy.