rebar question
rebar question
(OP)
hi ,
needed to get some opinions, i will be building a house in the carribean using cmu 8" thick and all cells grouted. my question is to use epoxy coated or galvanized rebar or use a heavier bar for the rust factor.
thank you
needed to get some opinions, i will be building a house in the carribean using cmu 8" thick and all cells grouted. my question is to use epoxy coated or galvanized rebar or use a heavier bar for the rust factor.
thank you





RE: rebar question
I've never heard of including a "corrosion allowance" to the diameter of untreated reinforcing bars. If the reinforcement starts to corrode it will eventually break off the cover, since corroded steel has approximately seven times the volume of non-corroded steel.
Perhaps of more importance is the mortar mix and the cover to the reinforcement. Check out the CCAA's "Durable Masonry Specification Checklist" (http://www.concrete.net.au/pdf/buildchecklist1.pdf) which proposes mortar mixes and minimum cover for different exposure environments.
RE: rebar question
Second, what dbuzz said is true on all counts.
I would concern myself with providing adequate cover to the steel and a good quality grout mix. Also the block itself can help you out. You can use block with intergral waterproofing, which will limit any water getting thru the block to the steel.
If you are really concerned about corrosion beyond this, I would look at using a corrosion inhibiting admixture or MMFX rebar. But I think these are overkill. If you have exposed tie beams/columns, you could spray exterior surface with a migrating corrosion inhibitor, rather than using an admixture.
RE: rebar question
RE: rebar question
RE: rebar question
I also agree with what the others said about grout quality and cover. I usually specify that horizontal brs in bond beams be supported in preformed wire hangers, known here as W2 hangers.