Steel Reinforcement Cover in Concrete Exposed to High Heat Environments 1

[larsacious]

Does anyone know of any documents that give recommendations for concrete clear cover to steel that is continually exposed to high heat environments? I am designing a foundation for a kiln that will have an operating temperature of around 200 degrees Fahrenheit and I am concerned about long term degradation.

I pinged ACI and all I found was cover for fire resistance.

 

[SlideRuleEra]

...designing a foundation for a kiln that will have an operating temperature of around 200 degrees Fahrenheit...

The Portland Cement Association (PCA) has a paper on their website titled "Fire and Concrete Structures". The paper primarily addresses short-term heating instead of long-term steady state heating that your project will experience. However, the information in the paper sheds light on how elevated temperature affects both concrete and reinforcing steel... at 200^o F, not much.

Also, if the kiln operates at 200^o F, the foundation and the soil around it will probably come to steady state thermal equilibrium at < 200^o F.

I would apply engineering judgement, specify the typical 3" minimum cover for concrete placed directly against soil with 2" minimum everywhere else (even is ACI allows less), and proceed with the project.

http://www.SlideRuleEra.net