Rebar in 4" CMU
Rebar in 4" CMU
(OP)
Can you place vertical reinforcement in 4" masonry blocks? I was told that you can't but after getting my hands on some it looks like you could get one bar.
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RE: Rebar in 4" CMU
RE: Rebar in 4" CMU
You CAN, however, post-tension a 100mm (4") block. It is then pressure grouted from the bottom... You need to use witness holes, and this is an expensive procedure only used for very specialised applications such as industrial overpressures.
RE: Rebar in 4" CMU
RE: Rebar in 4" CMU
RE: Rebar in 4" CMU
RE: Rebar in 4" CMU
Cheaper to just use 8"CMU, like these experts are trying to tell you.
M. Escher drew a bunch of things that cannot actually be built. You have to watch out for the physical limitations of your materials, especially constructability.
Good Judgement comes from experience; most experience is garnered from bouts of bad judgement. Try to use somebody else's bad judgement, your resume gets pretty bad if it is always your own bad judgement.
RE: Rebar in 4" CMU
RE: Rebar in 4" CMU
Also, have you ever seen self consolidating grout/concrete? I've been at plants and I've seen it in use. It would have no problem filling the cores even without vibration based on what I've seen.
RE: Rebar in 4" CMU
Unfortunately, few engineers really consider constructability and appearance and just arbitrarily specify a thickness and no more items such as strength, configuration (number of webs, web locations, etc.) based on some generic national minimums or configurations. Very often a "standard" 4" CMU cannot even be grouted because of the common core configurations.
Whatever CMU thickness you use, make sure the core configuration you specify is available for the thicknesses and bonding.
Dick
Engineer and international traveler interested in construction techniques, problems and proper design.