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[SEAOC] Re: concrete subjected to fire[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: [SEAOC] Re: concrete subjected to fire
- From: Oeyvind Saeter <oysater(--nospam--at)sn.no>
- Date: Mon, 18 Nov 1996 19:13:38 +0100 (MET)
At 20:11 18.11.96 -0800, you wrote: >What are the effects to concrete and reinforcing when subjected to fire In very short terms: 1. Fire => differances in temperature => forces => cracks (micro and makro) 2. Heat > 50°C starts to destroy pore structure. >~100°C this is significant. (this is causing by evaporation of pore-water that porduces forces (water-membran forces, I do not know any better word) that will "destroy" pore structure etc. (mico level) This causes loss of durability. 3. Chemical reactions in high temperatures may case loss of strenght - PS! I am VERY unsertain on this. Of these 3 in #1 the most significant. BTW! Rebar and concrete have different termic coifisients and will therefore have different increase in length caused by temperature. This will lead to forces between concrete and rebar - and in worst cases lead to loss of bond. oes ______________________________________________________________________________ Mr. Øyvind Sæter (Alternative: OEyvind Saeter) M. Sc. in Civil Engineering - Structural Analysis and Concrete Technology. Email: oysater(--nospam--at)sn.no | oes(--nospam--at)pvv.ntnu.no | oes(--nospam--at)pvv.unit.no All mail is forwarded to oysater(--nospam--at)sn.no WWW : http:\\www.pvv.ntnu.no\~oes Disclaimer: Information in this EMail has nothing to do with NTNU, PVV or my employer. If you do not like my spelling -> http://www.pvv.ntnu.no/~oes/misspelling.html ______________________________________________________________________________ ...
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