Concrete fall height
Concrete fall height
(OP)
Hello all...
I'm working as a special inspector on a project where there are 14' tall PCC walls, 12" thick, with double curtain rebar. The contractor plans on forming up the walls to full height and then placing concrete. There is nothing in the project plans that limit fall height for concrete and I didn't see anything in ACI 318 that specified a limit for concrete fall height. Am I missing something? Isn't there a potential for segregation of the aggregate material when pouring concrete from 14' high?
Thanks in advance for comments!
I'm working as a special inspector on a project where there are 14' tall PCC walls, 12" thick, with double curtain rebar. The contractor plans on forming up the walls to full height and then placing concrete. There is nothing in the project plans that limit fall height for concrete and I didn't see anything in ACI 318 that specified a limit for concrete fall height. Am I missing something? Isn't there a potential for segregation of the aggregate material when pouring concrete from 14' high?
Thanks in advance for comments!





RE: Concrete fall height
Link
Link
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Concrete fall height
The only thing ACI will say is to deposit concrete as close to its final position as practical to prevent segregation. The link clarifies that that's from a lateral (horizontal) standpoint.
RE: Concrete fall height
RE: Concrete fall height
RE: Concrete fall height
The other alternative is to specify SCC Self Consolidating Concrete. We have used this on a number of high rise shear wall and column jobs with great success.
RE: Concrete fall height
RE: Concrete fall height
http://files.engineering.com/getfile.aspx?folder=5...