The R-value of concrete is relatively low, typically around 0.08 to 0.10 per inch of thickness. For 120 mm (approximately 4.7 inches) of concrete, the R-value would be around 0.38 to 0.47. This indicates that while concrete provides some insulation, it is not highly effective compared to materials specifically designed for thermal insulation.
120mm = 0.00012km
The R-value of a Superior Wall typically ranges from R-11 to R-20, depending on the specific product and insulation used. Superior Walls are precast concrete foundation systems that incorporate rigid foam insulation to enhance energy efficiency. The exact R-value can vary based on the thickness of the insulation and the specific design of the wall system. Always check the manufacturer's specifications for precise values.
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120 millimeters = 0.12 meters
3588 centimetere
Normal Weight Concrete at 150 pcf has an R value of 1.22 per inch thickness
fiberglass
Fiberglass Insulation, R Value of 3.14. Pine board has an R Value of 1.74
Poured concrete has an R value of about 0.08/inch. Fiberglass batt has an R value of about 3.14/inch (blown fiberglass wall insulation is about 3.2/inch). From these values we can calculate that the equivalent insulating thickness of concrete would be about 3.5x3.14/0.08 = 137.4 inches. Note that concrete blocks have a somewhat better insulating value due to the incorporated air pockets. A 4" concrete block has an R value of about 0.2/inch An 8" concrete block has an R value of about 0.15/inch A 12" concrete block has an R value of about 0.1/inch
That is depending on your KL/r value . sammy Structural engineer That is depending on your KL/r value . sammy Structural engineer
M25 = 80 to 110mm in slab & beam M30 = 80 to 120mm in column
120mm = 0.00012km
Yes. Don't know for sure but its pretty low. however note that R value depends on the thickness. You double the thickness you double the R value.
The R value of a material is the thermal resistance of the material, so is dependent on the material's thickness. R is also the inverse of a material's thermal conductivity U. To work it out you need the k value ( the thermal conductivity) of the material and the thickness, then R=thickness/k. The k value for structural concrete (of density 2300kg/m3) is 1.6 W/mK (Units: Watts / (metre x degrees Kelvin) so for a thickness 100mm (0.1m) of this concrete, R=0.06 m2°C/W. Note that the R value in imperial units will not be the same. Check the units for any R value of any material that is given.
The best insulation for concrete basement walls is rigid foam insulation. It provides high R-value, moisture resistance, and is easy to install.
what is the slump value for M20 concrete
R. J. Currie has written: 'Carbonation depths in structural-quality concrete' -- subject(s): Concrete, Concrete construction