Vibration should be performed only long enough to consolidate concrete and dislodge entrapped air. Care should be taken not to over vibrate concrete causing segregation of the mix. Strip all forms when the concrete is the same age. Sandblast all surfaces sufficiently to remove marks and colored residue. Note, too much sandblasting may expose uncolored aggregates and substantially change the appearance of the finished wall.
Moderation is the key.
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