Er Joginder Singh
Replacement of steel reinforcing bars with carbon & glass fibre reinforced bars is a valuable invention to society. As per your research, bridges so constructed with these bars doesn't require any Maintance for the whole of its design life. Induction of this new material will probably reduce the maintenance cost .
This is a very good product. Think how much weight will be saved in construction. It should be cheaper, so it may quickly replace steel rebar. I think ground up plastic could be used as an addition to sand as a filler for concrete.
Pierre Latour
Basalt rebar has been around for years. Extruded from volcanic rock, it is cheap, impervious to rust, available in braided rope, etc. Polymer rebar is recycled? Cost?
The convenient thing about steel is that it had the same temperature contraction/expansion rate as concrete. If this polymer does too, then it's a winner.
This is exciting news. I read about basalt rebar, and geopolymer concrete a few years ago to be used for building oceanic structures - cities on the sea. I learned about it through New Atlas (Gizmag) when they did a story on the Seasteading Institute. I wish them the best of luck.
Epoxy coatings on rebar will in theory reduce rusting rates substantially, but the coatings don't appear to be that durable in the real world.
In Bangkok, I saw them using Bamboo in place of rebar.
Neal H.
I agree with everyone but what's the cost compared to rebar. Contractors and owners will be hard-pressed to switch if the change comes with a price. Also - I believe there's one mistake with the article. At the end it's stated that the cement was substituted with fly ash. I don't believe this to be the case. Fly ash is added to the concrete mix to cut down on the amount of cement needed. Cement is the binder (maybe the greatest glue of all time). Fly ash is not the same. It's basically a filler. But if you add fly ash you can REDUCE the amount of cement needed to obtain the same strength. Also - it should reduce cracking as the particulate size of fly ash is very small and fills in micro spaces within the concrete.
ridiculous... do you have an idea how many decades ago the mass-production of fiberglass-polymer rebars began and how many million tons of them are produced annually, or how many bridges and other structures are built using solely that type of rebar?
All to the good. Beautifying concrete is a bit of a problem, it's not the most attractive material. Glass has been added to replace sand. I wonder could beams be given a coat of glass on the outside. Grind glass to suitable size, glue it into the mould, pour the concrete. My simple experiment showed an increase in attractiveness. Coloured glass good.