Carbon fiber rebar cocnrete reinforcement

I think you are breaking new ground here. There probably won't be much data on graphite rebar. You will have the enviable chance to produce new data , never before seen, for others to copy. I'm not sure about the compressive strength either. Will it be hollow or solid?

My advice to you would be to do a cost comparison analysis first. You may decide to change topics after that.

Thanks for your reply im using a solid bar!

When I read your post and came to "... and has good compressive strength.", I had to check it out. I found a little bit at my good friend Wiki:

"When used as a replacement for steel, CFRP (Carbon Fiber Reinforced Polymer) bars could be used to reinforce concrete structures, however the applications are not common.

"CFRP could be used as prestressing materials due to their high strength. The advantages of CFRP over steel as a prestressing material, namely its light weight and corrosion resistance, should enable the material to be used for niche applications such as in offshore environments. However, there are practical difficulties in anchorage of carbon fiber strands and applications of this are rare."

I believe lynlynch is correct; the expense will far outweigh the advantages in all but the most demanding or mission specific applications.

thank you once again. I do know its corrosion resistant. What im wanting to know is what sort of corrosion can it withstand and the operating temperatures are it can be used for.

I thought it was more cost effective than using steel rebar in the long term?

Thank you very much thats much apreciated.

Chris, I am glad that CR4 was able to help you out.

In your case, one response has been singled out as helpful. I agree, it is a complete answer and should be helpful for you. I am going to do the customary thing around here and hit the Rate button on the bottom left corner of lynlynch's comment and vote 'Good Answer'.

As an aside: lynlynch, I see your 'Good Answer' #300 is coming closer. Please allow me to congratulate you early on this milestone. Well done, my friend.

Thanks for that. Although we all know that just means I spend too much time here, I appreciate the thought.

I don't know if carbon fiber rebar can be easily deformed (ripples/ridges) for good shear grip within the concrete. It might work as a post-tensioning member, though.

I think the 'grip' issue is the big question. I know a lot of R&D went into glass fiber reinforced concrete, to obtain a material with grip and compatible with the concrete chemistry. GFRC is brilliant for slabs, but I'm not sure if it's yet used in columns or 'trusted' for cantilevers.

Resin bonded 'rebar', I think will just be resin lubricated bar anyway.

Bit like roof panel anchors in tunnels