All thread rod as rebar

[Streetcar]

Galvanized or coated I would say no. Rebar is bare, uncoated steel for a number of reasons.

Most rebar is uncoated because that is the cheapest

 

[Streetcar]

I've been in construction inspection for 40 years.

Rebar is high carbon, graded and generally at least 40 grade usually 60 grade. (Very hard, very strong). All thread can come in different grades, but generally the off-the-shelf stuff is mild steel, same as a grade 2 bolt (different grading system).

While using this in your concrete won't do any harm, it won't replace rebar for adding additional strength. In other words. If you need rebar, use rebar as well.

Mild steel is just weaker rebar, the high end all thread is stronger rebar. I have repaired bridge piers using all thread as the reinforcement by design

 

[etpm]

Galvanized or coated I would say no. Rebar is bare, uncoated steel for a number of reasons.

I don't know why rebar is uncoated, mostly, but apparently galvanized steel is fine in concrete. I looked into this a while back because I have some 4 x 4 x 1/4 galvanized fencing, I think it is called hog fencing, that is excess to needs and I thought it might be good to add to a concrete pour. And the question about galvanized steel was answered in the positive. As I recall the alkaline environment of concrete is fine for zinc coated steel, it's acidic environments that attack zinc.
Eric

 

[yanmars]

I should have indicated what I plan to do. Have a lean to (15x40 feet) on an ag building. Would like to pour concrete in it as a floor, enclose the same so I can put in a toilet, shower and sink so I can clean up after working. The plan is to have 2 inches of concrete rigid foam, water vapor barrier and 4 inches of concrete. This pour would be drilled and pinned to the ag building concrete so no settling. No weight on the same except for foot traffic.
Just felt for such a light load the all thread rod would be sufficient.

 

[Rockbadchild]

''Concrete Alkalinity: Concrete is highly alkaline, with a pH typically ranging from 12 to 13. While galvanized steel generally has good resistance to alkaline environments, there is a possibility of the alkalinity of the concrete gradually degrading the zinc coating over time. This degradation can be influenced by factors such as the concrete's pH, moisture content, and temperature. However, in many cases, the corrosion protection provided by galvanizing is sufficient for the intended service life of the structure.''

''In summary, galvanized steel can be used in concrete structures where corrosion resistance is important. However, it is essential to ensure proper surface preparation, sufficient concrete cover, and consider factors such as alkalinity and compatibility with concrete additives. Consulting with structural engineers, galvanizing specialists, or concrete experts can provide more specific guidance based on the project requirements and conditions.''

 

[Gem99ultra]

I should have indicated what I plan to do. Have a lean to (15x40 feet) on an ag building. Would like to pour concrete in it as a floor, enclose the same so I can put in a toilet, shower and sink so I can clean up after working. The plan is to have 2 inches of concrete rigid foam, water vapor barrier and 4 inches of concrete. This pour would be drilled and pinned to the ag building concrete so no settling. No weight on the same except for foot traffic.
Just felt for such a light load the all thread rod would be sufficient.

I wouldn't hesitate for a minute using the all-thread. I bet it'll be stronger than the chicken-wire, and other trash metals that I've used in the past. Foot traffic and shower, etc. isn't going to come anywhere near enough weight to break your 4" of concrete slab.

 

[Shenandoah MF1760]

I've used 3' all thread with muffler clamps to anchor swing sets, works better than concrete. Makes good tent stakes too. The threads provide gripping you wouldn't get with rebar.

For concrete work, I wouldn't hesitate to use scrap all thread.

 

[olenjohn]

I should have been more specific. This is for a slab pour that will be inside and really have nothing heavy on it.

For an inside slab pour with very little load, you are wasting the thread rod and your time putting it in. Sell or use the thread rod for other purposes. Fiber reinforced redimix will work just fine for your floor. Never use the thread rod for an elevated slab reinforcement. 40 years in construction / engineering industry so I might just happen to know something about it.

 

[not2old]

Didn't know you weren't supposed to weld rebar. I thought I'd seen it done on some very large posts/piers on TV. Only done it when making my own concrete railway ties for a retaining wall so I won't worry about it.

 

[Streetcar]

I should have indicated what I plan to do. Have a lean to (15x40 feet) on an ag building. Would like to pour concrete in it as a floor, enclose the same so I can put in a toilet, shower and sink so I can clean up after working. The plan is to have 2 inches of concrete rigid foam, water vapor barrier and 4 inches of concrete. This pour would be drilled and pinned to the ag building concrete so no settling. No weight on the same except for foot traffic.
Just felt for such a light load the all thread rod would be sufficient.

Four inch thickness will be hard to get any practical use from reinforcing steel except as crack control