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to Hahausuck
Re: Concrete cracks -Revisitedsaid by Hahausuck:What caused the crack and shift? Probably the soil shifting under the slab. said by Hahausuck:Bascially what you are saying is it wouldnt matter if I undercut it and repaired with cement mixture or if I caulked in a poly sealant material. Correct? Correct. That will only prevent water from getting into the crack for a while. Eventually the pieces will shift further. How soon would only be a guess. It could be 1 month or 3 years. That repair material will not magically add shear strength to the concrete. said by Hahausuck:If that is the case then the only repair is busting all of it out and pouring a new slab? Unfortunately yes. |
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Thanks. Figured as much.
Should I even then bother undercutting it before I fill it? |
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cowboyro
Premium Member
2012-Nov-5 12:25 pm
said by Hahausuck:Should I even then bother undercutting it before I fill it? Definitely won't hurt. If you have an angle grinder with a concrete cutting wheel it shouldn't be a big issue. Just wear a dust mask and goggles... |
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Alright.
I know someone mentioned using the cutting wheel to me in another thread and how to keep the thing wet. How critical is that? Could the wheel be run dry? |
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leibold MVM join:2002-07-09 Sunnyvale, CA Netgear CG3000DCR ZyXEL P-663HN-51
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No. The blade will wear down too fast and you are making the dust problem far worse (it is easier dealing with the mud puddles then widespread concrete dust).
When I rent a concrete saw here they measure the blade diameter and fees are based on how much the blade is worn down (a big incentive to keep the blade cooled with water). |
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OK sounds good.
I guess the time has come to spring for an air compressor. Thanks. I'll report back later. |
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to leibold
Might be worth it to pick up an angle grinder. You can get a diamond blade for around $20 at Lowes or Menards. They cut like butter compared to the masonry wheels. You can run them without water. |
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I know there are grinder wheels that are meant for dry use but I just can't see using them for any long duration. They'd have to wear faster than a wet wheel. |
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robbin Mod join:2000-09-21 Leander, TX 2 edits |
to eagleknight
That's what I would use -- diamond blade dry.
edit -- Diamond wheels last a long time, even dry. No need for an air compressor either. Cheap electric grinder works well for this. |
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Thanks Robbin.
Looks like a Harbor Freight trip for a grinder is in order. |
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decorative coating |
Once you have all the concrete filled... Have you thought about decorative concrete coatings like the attached picture (that I borrowed from Google search images). Even a garage epoxy style coating will cover up the repairs. |
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to robbin
Grabbed a grinder that was on sale at Harbor Freight and a wheel at home d. Last night I did some research on materials and I found Quickrete has a resurfacing product with polymer in it that can be used for repair and resurface. Grabbed a bag of it at lowes.
My plan is to undercut the crack, and then rinse it out. Mix up the concrete repair as per label for a mortar mix and fill the crack then top it and brush the finish to help blend it.
I know it's not the be all end all fix as some day I'll have to replace the slab. |
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