Surface Voids || Bug Holes on Concrete Surface

Surface Voids in Concrete | Bug Holes in Concrete

Surface Voids

These are the little holes that appear on the concrete surface. These voids may produce unacceptable appearance on the surface of the finished casting.

Air Voids/Surface Voids/Bug Holes

Causes of Surface Voids / Bug Holes in Concrete

It is generally due to the following three factors:
1. Release Agent
2. Release Water
3. Release Air

Mixing Concrete/Mixing Time

Helpful Hints 

Hint No. 1

Extend the mix time to help break up any residual air or water bubbles. This will promote a more uniform and workable consistency.

Shuttering Oil

Hint No. 2

Make sure to that release agents are applied in thin films. This will eliminated any pooling or puddling in the lower portions of your mold.

Hint No. 3

Cement

Lower the viscosity of cement by adding sand or fly ash.
This allows large aggregate to move more freely and reduces
the amount of air entrapment.

Hint No. 4

Aggregate

Use aggregate that is more uniform in shape. Irregular shaped pieces of aggregate tend to make the concrete less fluid.

Hint No. 5

Techniques used during vibration can eliminate most surface voids.
Vibrating both the outside and inside of you mold will draw most air

Vibrator

and water bubbles away from the surface of the concrete. Hammering the mold can eliminate any residual voids.

Wooden Hammer

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