Filling an irregular gap in broken concrete

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Old 06-15-17, 03:58 PM
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Filling an irregular gap in broken concrete

I'm looking for a flowable concrete formulation that will let me fill an irregular gap (crack 0-3 inches wide) in a piece of concrete.

I've thought about simply pouring self-leveling concrete down the crack, but I'm afraid that locations more than an inch thick will never cure. Anyway, most of it won't have access to air, so any solvents associated with the polymer won't be able to escape.

I've thought about flowable fill, but it doesn't seem very strong and I'm not sure about the technique for mixing and settling it.

Any ideas?

I'm aware that this patch won't be perfect, but its for an inexpensive property in a 2.5 world country. Good enough is good enough.
 
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Old 06-15-17, 04:12 PM
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You have to remove any loose pieces first. After you do that, it will be easier to choose a product. Why don't you do that & post a pic?
 
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Old 06-15-17, 04:45 PM
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So the first question is why did it crack in the first place.

If the concrete is unstable, thus the crack, anything you put down will crack as well.

Any mortar or concrete product will fill but as mentioned it will be temporary.

Another option is concrete crack filler, Sika is one brand from HD or Lowes, it's a self leveling product and will accept some movement.
 
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Old 06-16-17, 08:15 AM
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It cracked because several plants are trying to grow through it. I'm removing the plants and as much organic material as I can.
 
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Old 06-16-17, 10:08 AM
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You still need to remove any loose concrete.
 
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Old 06-21-17, 12:54 AM
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Thanks.

For anyone else who has this question: I wound up making and testing some mixes of portland cement (type 1) and fine sand (1/8" mesh).

I'm not done yet, but it looks like a 1:2:1 mixture of cement:sand:water (by mass) may be adequate. There is also a product called SikaGrout 212 that has been recommended. I haven't tried it yet.
 
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Old 06-21-17, 04:37 AM
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When mixing Portland, we used to say that you want the consistency of Sherbet not soup & not meatballs. We generally used 1 Portland to 3 sand, water as needed.
 
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