High water velocity over concrete
High water velocity over concrete
(OP)
I am doing a preliminary dam design study, where water is jetting out off undersluices at a velocity of 25-30 m/sec. Too high, and I provided heavy steel lining over the concrete surface, properly anchored.
Now I am under heavy criticism and peers say, I should go for high performance/ high strength concrete. They do not seem to have any eaxmples, but feel, it is much easier done and if required, repaired. I do not contest that steel lining is difficult to erect, but I am a bit nervous with any concrete becuase of no experience with such high water velocities.
Your ideas, on this issue are most welcome.
Now I am under heavy criticism and peers say, I should go for high performance/ high strength concrete. They do not seem to have any eaxmples, but feel, it is much easier done and if required, repaired. I do not contest that steel lining is difficult to erect, but I am a bit nervous with any concrete becuase of no experience with such high water velocities.
Your ideas, on this issue are most welcome.
Ciao.






RE: High water velocity over concrete
As far as high strength concrete, silica fume, etc., count me as a skeptic. The ACI document reviews the use of these, but I think it is just a delaying tactic. A better idea is to remove the offending process (cavitation, erosion, etc.) than to spend a lot of money on fancy mixes.
RE: High water velocity over concrete
Cavitation produces pressures of up to 100,000 psi. If you aerate the jet, you may be successful in reducing the amount of cavitation. You should also attempt to trap sediment before it goes through the sluiceway. Either steel or high strength concrete are recommended, however, neither one can provide full protection. I'm not sure one is better than the other. We are contemplating rubber on a dam to reduce erosion caused by sediment flow over a dam. However, I don't think rubber in your sluiceway would be recommended either. Perhaps you can use a layer of high strength steel over a layer of high strength silica fume concrete. Kind of a belt and suspenders approach.
RE: High water velocity over concrete
RE: High water velocity over concrete
RE: High water velocity over concrete
RE: High water velocity over concrete
http://www.silicafume.org/general-concrete.html
RE: High water velocity over concrete
RE: High water velocity over concrete
RE: High water velocity over concrete
RE: High water velocity over concrete
RE: High water velocity over concrete
RE: High water velocity over concrete
RE: High water velocity over concrete