Thermal resistivity
Thermal resistivity
(OP)
Is ther a good reference to to find the thermal reisistiviy of concrete?
What I am looking for is a reference for mix types. If I call the local batch plant and get mix # XXX ( I would assume made to an ASTM or some standard) is there a reference to get the Rho (thermal Resistivity- in units of C-cm/wat ).
I am using this in an electrical duct bank and the easy way out is to use a Rho of 55 as given in the National Electrical Code. I have read that the thermal resistivity can vary with cement content and aggregate.
Is there an ASTM standard that i could refer to?
Thank you for your pateience in reading this, this has probably been addressed in this forum already but i haven't found it yet.
BJC
What I am looking for is a reference for mix types. If I call the local batch plant and get mix # XXX ( I would assume made to an ASTM or some standard) is there a reference to get the Rho (thermal Resistivity- in units of C-cm/wat ).
I am using this in an electrical duct bank and the easy way out is to use a Rho of 55 as given in the National Electrical Code. I have read that the thermal resistivity can vary with cement content and aggregate.
Is there an ASTM standard that i could refer to?
Thank you for your pateience in reading this, this has probably been addressed in this forum already but i haven't found it yet.
BJC





RE: Thermal resistivity
Also, there are no "Standard" concrete mixes. There may be some local standard mixes in different areas of the country, but overall there is no standard to mixes.
RE: Thermal resistivity
RE: Thermal resistivity
Phone (905) 727-6448
They do thermal testing of concrete for the power industry. My understanding is that they can help devlop trial batches, but some testing must be done to insure R values are obtained.
RE: Thermal resistivity
I use to work construction projects and we always built an on-site batch plant. They were set up with recipes for different mixes. The first plant I worked on used punch cards the last one used a PLC to get a mix "number". I though the mix numbers were to some standard.
No matter what the mix we always did slump test and took sample cylinders to break at intervals after the placement.
Thanks again