| Thermal Conductivity – k – W/(m K) | |
|---|---|
| Material/Substance | Temperature |
| Gypsum board | 0.17 |
| Hairfelt | 0.05 |
| Hardboard high density | 0.15 |
Then, how do you calculate thermal conductivity?
K = (QL)/(AΔT)
- K is the thermal conductivity in W/m.K.
- Q is the amount of heat transferred through the material in Joules/second or Watts.
- L is the distance between the two isothermal planes.
- A is the area of the surface in square meters.
- ΔT is the difference in temperature in Kelvin.
Keeping this in consideration, how thick is gypsum plaster?
The thickness of undercoat of gypsum plasters are generally 11 mm thick for walls and 8 mm thick for ceiling and finish coat plaster is 2 mm thick.
Is gypsum a good heat conductor?
The noncombustible core of gypsum board contains chemically combined water which, when exposed to high heat, is slowly released as steam, effectively retarding heat transfer. Even after complete calcination, when all the water has been released, it continues to act as a heat-insulating barrier.
What are the characteristics of gypsum?
Gypsum Physical Properties
| Color | Colorless to white; may be yellow, tan, blue, pink, brown, reddish brown or gray due to impurities |
|---|---|
| Mohs Hardness | 2 |
| Specific Gravity | 2.31–2.33 |
| Diagnostic Properties | Transparent and bladed crystals Alabaster Fine-grained, slightly colored |
| Crystal System | Monoclinic |
What are the properties of gypsum plaster?
Properties of Gypsum Plaster
Gypsum plaster does not shrink during drying and hardening processes unlike cement plaster. It is less prone to cracks. Gypsum is non-combustible and contains high content of crystal water. In the event of fire, it acts like a barrier and protects the block work, concrete and steel.
What are the thermal properties of construction materials?
Thermal Properties of Building Materials
- Thermal Conductivity, Thermal Conductance.
- Thermal Resistance.
- Thermal Transmittance ‘
- Resistance of Surfaces.
- Thermal Capacity.
What is gypsum formula?
Gypsum is the name given to a mineral categorized as calcium sulfate mineral, and its chemical formula is calcium sulfate dihydrate, CaSO4⋅ 2H2O.
What is gypsum plaster?
Gypsum plaster is a white cementing material made by partial or complete dehydration of the mineral gypsum, commonly with special retarders or hardeners added. Applied in a plastic state (with water), it sets and hardens by chemical recombination of the gypsum with water. … See also plaster of paris.
What is plaster of Paris formula?
The chemical name of plaster of Paris is calcium sulphate hemihydrate because half molecule of water is attached with calcium sulphate. The chemical formula of plaster of Paris is CaSO4.1/2H2O.
What is the difference between plaster and gypsum?
The key difference between gypsum and plaster of Paris is that the Gypsum contains calcium sulfate dihydrate whereas the plaster of Paris contains calcium sulfate hemihydrates. Gypsum is a naturally occurring mineral. … Therefore, this is the main difference between gypsum and plaster of Paris.
What is the thermal conductivity of asphalt?
The thermal emittances of dense-graded concrete and asphalt are similar, being in the range of 0.90 to 0.95. Thermal conductivity is a measure of the ability of a material to conduct or transmit heat.
Why is gypsum used in plaster?
Gypsum plaster has good insulation properties, fire resistant and impact resistant. Also, gypsum saves a lot of time during construction and has superior finish. These properties have clearly drawn attention of real estate builders and contractors towards choosing gypsum plaster over traditional cement plaster.