huangyhg

high temperature concrete
i have an industrial oven approximately 20ft square that's going to be sitting on a concrete slab. the oven doesn't have a floor, so the concrete will be exposed to the 600 degree farenheit temperatures of the oven.
does anyone know of any design guides for this type of application, any articles? what type of concrete mix would you use? i've looked at some refractory concrete mixes, but they all seem to be ceramic. is that the only option?
what about reinforcing?
right now, this is a typical 6" slab on grade with #4@12" each way. i don't think that's going to cut it.
i don't think concrete can survive such high temperature and effect of subsequent cooling, lining or insulation would be required. have you tried to search for articles on chiminey design, it may give you some ideas on what methods are feasible
years ago i was involved in a design for a concrete flue exposed to high temperatures. i think we used a cement called lumnite calcium aluminate cement, and we had to use special aggregates like blast furnace slag. i'll look for more info.
refractory brick commonly used in fireplaces can withstand these temperatures.
concrete will probably be ok for your application, but it is borderline. see "effect of long exposure of concrete to high temperatures", an out-of-print document by the portland cement association. you can download the document (free, .pdf) from this page of my website:
check out fondu cement or fondag.
thanks everyone.
i found a product called "firerok" that's a cementious material good up to 1800 degrees. i might just call that out to be on the safe side.
you're the greatest slideruleera
any opinions on reinforcing?

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