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120mm = 0.00012km
4.72440945
The answer will depend on the value of r.The answer will depend on the value of r.The answer will depend on the value of r.The answer will depend on the value of r.
To convert U vals To R Vals 1/u = r val
120 millimeters = 0.12 meters
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
To provide the same insulation value as 3.5 inches of fiberglass, a concrete wall would need to be approximately 15-18 inches thick. Concrete is a poor insulator compared to fiberglass, so a much thicker wall is needed to achieve similar insulation properties. Alternatively, adding insulation material within the concrete wall can help improve its insulating capabilities.
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