CONCRETE-DEFECTS Defects
slabs Slab cracks crazing
and map cracking -improper
curing -improper
reshoring -cracks
form from inside corners of columns and
walls the weak point of the slabs prevention... -groove or saw before concrete cures around columns and every 15 meters -insure slow curing during warm weather, by ponding or covering with wet burlap or by spraying with a sealer dusting -too
much water at surface prevention -do not over work concrete bringing too much water to surface -when heating in a hoarded situation make sure that there is a fresh air supply scaling caused
by trowelling before bleed water is gone -or
chemical deicers spalling caused by premature stripping and improper stripping techniques voids -voids
beneath bucks and blockouts Wall air
pockets prevention...feed concrete when pouring from one side only and vibrate through until full on other side efflorescence honeycomb
coarse aggregates and air spaces often caused by over vibration on a poor seam bleeding or not vibrating enough prevention -make sure all seams are tight and all corners are well cornered locked
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