Strength Invesitgation of Extensively Heated Concrete
Strength Invesitgation of Extensively Heated Concrete
(OP)
I am investigating a foundation of two large turbine generators. The concrete is about 40 years old, and it has been heated to 400 to 700 degrees Fahrenheit for most of its life. Spalling and cracking of the concrete in some areas has made the client concerned about the concrete strength. The foundation is not on grade, but is supported on an elevated slab with beams and columns for support.
We will be doing Windsor Probe tests as well as taking some cores to determine the concrete's present strength. I would also like to research the effects of high temperatures on reinforced concrete to help with the investigation and report write up.
Does anyone know an easily accessible, and thorough resource for the effects of temperature on reinforced concrete?
Any information would be appreciated.
Paul
We will be doing Windsor Probe tests as well as taking some cores to determine the concrete's present strength. I would also like to research the effects of high temperatures on reinforced concrete to help with the investigation and report write up.
Does anyone know an easily accessible, and thorough resource for the effects of temperature on reinforced concrete?
Any information would be appreciated.
Paul





RE: Strength Invesitgation of Extensively Heated Concrete
RE: Strength Invesitgation of Extensively Heated Concrete
The Portland Cement Association has extensive literature on heat affects on concrete. Much of it follows the fire resistance analysis of concrete, not necessarily consistent, long term exposure. Armand Gustaferro is the noted expert in this field.
I would suggest you check the depth of carbonation of the concrete from the cores you take. Remember, concrete is a fairly good insulator and the surface damage might not be indicative of the integrity of the concrete at depth. Petrographic examination of the cores, in addition to the check for depth of carbonation, will tell give you a good assessment of the matrix integrity.
The Windsor Probe should not be used as a definitive tool, but may be used as a discriminator of area changes.
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RE: Strength Invesitgation of Extensively Heated Concrete
I would expect that the spalling and cracking are related to temperature cycling in the early life of the structure, and that the concrete is not greatly compromised in terms of strength.