civilstr11
Civil/Environmental
- Apr 8, 2009
- 3
Hello - I am looking at determining the continued usage of the cited facility. I came across this thread and response from Eng-Tips user Ron:
In general, no. You can get some localized spalling if the temperature gets very high. To lose strength in concrete due to heat, it has to be held at temperatures above 600 to 800C for 3 to 4 hours.The most common effect of heat on concrete is spalling due to moisture expanding in the pores, and carbonation of the surface, usually to a depth less than 1/8".
My questions are:
1. Anyone know the resource(s) for Ron's response?
2. We had a structural evaluation from a structural firm that recommended epoxy injection in the vertical walls cracks. Removal of spalled or delaminated concrete to sound concrete, sandblast of corrosion and prepare the substrate for bonding. Reinstalling fire panels at the burn stations. The spec. for the fire panels and the set is uploaded. Due to budget restraints, the fixes are limited to fire panel replacements and some remove and replace of spalled concrete. I would like input from the community on their confidence of the continued usage of the building with the limited repairs. We could also direct the fire department to control the burns for the training to max temperature. If we pursue that route anyone has experience on how to implement such a control?
Thanks on Advance for your help.
In general, no. You can get some localized spalling if the temperature gets very high. To lose strength in concrete due to heat, it has to be held at temperatures above 600 to 800C for 3 to 4 hours.The most common effect of heat on concrete is spalling due to moisture expanding in the pores, and carbonation of the surface, usually to a depth less than 1/8".
My questions are:
1. Anyone know the resource(s) for Ron's response?
2. We had a structural evaluation from a structural firm that recommended epoxy injection in the vertical walls cracks. Removal of spalled or delaminated concrete to sound concrete, sandblast of corrosion and prepare the substrate for bonding. Reinstalling fire panels at the burn stations. The spec. for the fire panels and the set is uploaded. Due to budget restraints, the fixes are limited to fire panel replacements and some remove and replace of spalled concrete. I would like input from the community on their confidence of the continued usage of the building with the limited repairs. We could also direct the fire department to control the burns for the training to max temperature. If we pursue that route anyone has experience on how to implement such a control?
Thanks on Advance for your help.