Formworks leaks
Formworks leaks
(OP)
In your practice (besides Ingenuiy), how often do you encounter formworks leak? Do you put putty all over the edge? How many contractors actually do this?
Without putty covering the leak, the bottom side edge of beams can form tiny honeycomb like in the following picture.
http://img560.imageshack.us/img560/7161/jn0p.jpg
Do you encounter it too? Is it common that you just cover it up with cement finishing? Does this occur for all formworks not totally sealed?






RE: Formworks leaks
RE: Formworks leaks
Do all use wood for the form ply, or are there other materials used?
RE: Formworks leaks
RE: Formworks leaks
RE: Formworks leaks
Concrete that is not properly designed or mixed may have excess bleed water, which could carry away paste.
There are placements which use expanded mesh as forms or loosely spaced boards, and they work just fine with the right mix.
RE: Formworks leaks
Slabs and beams bottoms needs to be shored for at least a month because concrete takes 28 days to gain strength so do you consider 28 days as long enough for wood to desiccate the concrete? And what is the context of "the wood is not sealed well"? The form works edges not sealed or the wood surface not sealed by oil?
What is the appearance of desiccated concrete?
RE: Formworks leaks
Dik
RE: Formworks leaks
RE: Formworks leaks
Flying formwork systems for high rises are a different animal though where shoring removal is usually staged over a month or so in phases as the floors below become able to support the load from above.
Mike McCann
MMC Engineering
RE: Formworks leaks
Regarding your last point there is an interesting case study of when that principle wasn't adhered to properly. See link:
https://en.wikipedia.org/wiki/Skyline_Towers_colla...
RE: Formworks leaks
I, too, was in Alexandria from Jan to April of '73. Must have happened after I left. I was staying in a highrise then too - 18th floor of 24 if I remember correctly.
)
Mike McCann
MMC Engineering
RE: Formworks leaks
My understanding is that in the wake of it the governing municipality (Fairfax County) established a critical buildings department separate from their regular building department. I'm not sure what the threshold criteria is for what fits into that category but any high-rise building surely would.
RE: Formworks leaks
The higrise I was staying in was on the west side of Jefferson Davis Highway, about a mile or two south of the river.
Mike McCann
MMC Engineering
RE: Formworks leaks
RE: Formworks leaks
Man that's the truth alright!