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Why “slicing” along the form is required to be done?

At the form boundary, there is no place for entrapped air to escape. As such, immersion vibrator can not expel the air from form boundary. This is the reason behind doing “slicing” along the form by means of a flat plate on edge. “Slicing” removes the air entrapped air in the concrete layer along the form.

Absorptive linings offer an alternative but expensive option.

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