Microwaves and Rebar
Microwaves and Rebar
(OP)
Does anyone have any information on the effect,if any that microwave could have on rebar.I plan to design a cast in place wall,but my rebar must be close to the surface of the wall.will the microwaves be deflected,or penetrate the concrete and undermine the steel.
thanks
ed
thanks
ed






RE: Microwaves and Rebar
Have you ever noticed that microwave antenna are often found on steel towers?
TTFN
RE: Microwaves and Rebar
RE: Microwaves and Rebar
RE: Microwaves and Rebar
What kind of microwaves are we talking about here?
RE: Microwaves and Rebar
could a wave in that range penetrate the concrete about 2in and heat the rebar to the point of structural damage?
RE: Microwaves and Rebar
You could assume that all energy from the generator went into the rebar, then find resulting rebar temp. Then you have a heat transfer problem, instead of an electrical engineering problem. If the amount of energy was fairly low, this would be a reasonable approach to show that there was no significant effect.
Not a microwave expert- but I understood that microwaves heat up food mainly by heating water molecules. In which case, I'm not so sure you wouldn't heat up the concrete and NOT the rebar here.
RE: Microwaves and Rebar
Hope this helps.
RE: Microwaves and Rebar
How much power are you generating?
TTFN
RE: Microwaves and Rebar
This is a mil spec job,so my details will need to be abstract.
we have a big,big, big,microwave generator.it has an extrenal start up power source.once started it fires off microwaves in to salt water.salt water turns to steam,steam turns a tubon,turbon makes power,power feeds microwave generator,which makes more power. and you get the idea.
does a microwave cause damage to concrete,and steel.
do the walls of containment need to be reflective of the waves? will the rebar expand,or shrink?will the h2o in concrete be heated? help!
RE: Microwaves and Rebar
From your description above, this sounds like a perpetual motion device. If that's the case, the whole issue is kind of moot. But assuming I'm missing something somewhere, you do need reliable information from the people who are in a position to furnish it.
RE: Microwaves and Rebar
I would expect the microwaves to heat the water in the concrete and possibly lead to thermal cracking and spalling if the water gets hot enough. The electric field the microwave generates could induce a current in the rebar if it is powerful enough to penetrate the concrete cover. Obviously that wouldn't be a good thing. Did you ever put metal utensils in the microwave in your kitchen? Of course, I'm no expert in microwave radiation. That's why I think you should get a professional who is.
RE: Microwaves and Rebar
GOT SOME SPEC ON THE MICROWAVE GENERATOR.WHEN I POSE Q&A TO THE DESIGNERS I AM TOLD WE'VE NEVER DO THAT BE FOR?OR THIS DEVICE WAS NEVER DESIGNED WITH THIS APP.IN MIND.THANKS GUYS I THINK I NEED TO FALL BACK AND REGROUP ON THIS AS YOU HAVE SAID
THANK ED