poured concrete wall house
poured concrete wall house
(OP)
Interested in information and experiences with poured concrete wall construction for a house. Do you use just a mat of reinforcement bars or do you utilize wwf as well? Owner wants to construct himself "slowly" presumably mixing his own concrete. He is going to have cold construction joints all over the place right...how will this effect the wall strength? If you were going to construct the walls slowly, could you have some kind of moving formwork that you could creep up the walls? Any good reference reccomendations for poured concrete wall construction?






RE: poured concrete wall house
Dik
RE: poured concrete wall house
RE: poured concrete wall house
RE: poured concrete wall house
Dik
RE: poured concrete wall house
RE: poured concrete wall house
I don't have any experience with an owner wanting to do concrete pours at his own leisure creating a load of cold joints...not that it can't be done, but it seams a little odd. I would be very hesitant as it is if he is going to mix the concrete himself as well.
RE: poured concrete wall house
RE: poured concrete wall house
He must REALLY want to save money on labor if he is carrying bags of concrete to build it!!!!
RE: poured concrete wall house
RE: poured concrete wall house
Dik
RE: poured concrete wall house
Also, hand mixed, bagged concrete will assure a poor quality control and lack of uniformity (mixing conditions, water quantity, etc.) It might be good enough, but I would plan on 2500 psi, max. Also, the cold concrete needs to be wet to SSD prior to placing fresh concrete, and formwork needs to be coated with form oil or a needs a surface that will prevent drawing out the mix water.
Additionally, if the steel reinforcement is left exposed for long periods (more than a few months, especially in severe conditions, like near a coastline), there could be an issue with corrosion. Light rust would be fine, but flaky rust could be a problem if the guy takes years to finish the project.
RE: poured concrete wall house
it was in the original post asking if WWF or reinforcing bars should be used.
TXStructural,
Can't say I have ever seen WWF used or spec'd for walls before?
RE: poured concrete wall house
RE: poured concrete wall house
Thanks... couldn't get past the Welded Wide Flange... and WWF or WWM is often used for precast wall panels... never seen for CIP concrete stuff, though...
Not sure why conc above grade unless ICF, maybe a bunker? To me, wood makes more sense, easier to keep cool with concrete, though...
If he has successfully built one before, he should use the same technique...
Dik
RE: poured concrete wall house
As to WWR (mesh), the proposed construction will have lots of cold joints, and unless there is a bit of reinforcement crossing each joint, the concrete "pieces" would function as irregularly-shaped concrete bricks. CMU works because there are flat horizontal surfaces with voids which encourage key formation by the mortar. You would not get these with the one-bag-at-a-time method. WWR can successfully be used in walls anywhere pre-placed reinforcement is used. I was in a wire plant last year where they were producing 8 ft by 30-40 ft sheets of 1/2" deformed wire mesh for use in water treatment plant walls. Obviously, it is not really popular on residential and light commercial job sites since it has to be handled with a crane of some size. In the application proposed, the guy could easily carry either #3 bars or typical sheets of builder's mesh. (The rolls would be unworkable unless he was willing to carefully flatten them - an almost impossible task.)
Haiti had lots of unreinforced (or poorly constructed reinforced) concrete walls supporting concrete roofs. A reason the death toll was so high. When the ground started moving, there was nothing to encourage the roof to move, so the walls broke and let the roof fall.
RE: poured concrete wall house
Next home will be ICF or filled CMU.
Jim
Jim Kinney
Kennedy Space Center, FL