Quick Answer: How To Repair Hairline Cracks In Concrete Driveway?

Should you fix hairline cracks in concrete?

Broken Rule One: Hairline cracks are not worth the trouble fixing. Did you know that just about every crack in concrete started out as a hairline crack? Some so fine, you can not even see them with the naked eye. Cracking naturally occurs in concrete slabs as the concrete cures and shrinks.

How do you seal hairline cracks in concrete?

A highly fluid epoxy (such as a flowable-grade granite epoxy) will fill and seal a crack nicely if you can get it into the crack. Keep in mind that materials like epoxy are effective because they wet out the concrete. Functionally, this helps to draw the epoxy into the crack.

What is hairline cracks in concrete?

A.: ACI 116R-90, Cement and Concrete Terminology, defines hairline cracks as cracks in an exposed concrete surface having widths so small as to be barely perceptible.

Will hairline cracks in concrete get worse?

Hairline cracks in a concrete slab are rarely a cause for concern. They can be controlled, but not eliminated. A crack in a slab of 1/8 inch or less is typically a normal shrinkage crack and not a cause for concern.

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What causes hairline cracks in new concrete?

The main cause behind the generation of hairline cracks in concrete is plastic shrinkage which is the rapid depletion of moisture from the fresh concrete within its plastic state.

Is cracking in concrete normal?

When you see a crack in your concrete slab or wall, your first assumption is typically that something has been done wrong–but that’s not always the case. Actually, concrete cracks are very common, some are even inevitable.

What is the best concrete crack sealant?

Best Fast Drying Crack Filler

  • Dap 37584 Liquid Cement Crack Filler.
  • PC-Concrete Two-Part Epoxy Adhesive Paste for Crack Repair.
  • Bluestar Flexible Concrete Crack Filler.
  • Dalton Latex-ite 35099 PLI-STIX Asphalt and Concrete Crack Filler.
  • Rust-Oleum EpoxyShield Concrete Patch and Repair.
  • EZR Hairline Crack Sealer.

How do I keep my concrete slab from cracking?

4 WAYS TO PREVENT CRACKED CONCRETE

  1. Start with a sound subgrade. Make sure the subgrade is compacted.
  2. Modify the concrete mix. Use a low water-to-cement ratio.
  3. Install joints. Be active in deciding where control joints will be placed.
  4. Properly cure the concrete. Properly curing concrete slabs: Why and how to cure.

How thick does concrete need to be to not crack?

Applied-load cracking.



In residential concrete, 4 inches is the minimum thickness for walkways and patios. Garage slabs and driveways should be 5 to 6 inches thick if any heavy truck traffic is anticipated, otherwise 4 inches is adequate.

Can you pour new concrete over old cracked concrete?

There are situations when pouring new concrete isn’t the most suitable option. For instance, surfaces with larger cracks, heaving or settling conditions, or where height cannot be raised, replacement is a better solution. However, in most cases, you can pour a new layer of concrete onto the existing one.

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How big is a hairline crack?

Size of cracks



0 – Hairline cracks: Less than 0.1 mm in width. No repair action required. 1 – Fine cracks: Up to 1 mm in width. Generally restricted to internal wall finishes.

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