Segregating the Mix
Dropping concrete into a drilled caisson from the surface will result in a weak caisson, as the aggregates segregate when dropped from excessive heights.
Bottoms UP!
ACI
318-11 says that all concrete shall be placed as close to the final point
of placement as possible.
That means filling the drilled hole from the bottom up.
Title 24 of the California Building Code.
Section 1905A.10.9 states:
"In
depositing concrete in columns, walls or thin sections of considerable
height, concrete shall be placed in a manner that will prevent
segregation... unless otherwise approved by the enforcement agency, the
unconfined vertical drop of concrete... to the placement surface shall
not be greater than 6 feet (1829 mm)."
So, in California, the code allows contractors to drop the concrete a maximum of 6 feet.
Paolo Benedetti, SWD
Aquatic Artist, Watershape Consultant, Expert Witness, International Construction Management
Contact the author at: info@aquatictechnology.com or 408-776-8220
"Creating water as art."™
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