2. GYPSUM
Gypsum is a soft sulfate
mineral composed of calcium
sulfate dihydrates.
Chemical formula
(CaSO4·2H2O)
It found in lake and sea water.
3. Gypsum use for manufacture of wallboard, cement
and plaster of Paris.
2% gypsum added in the cement due to in controlling
the rate of hardening of the cement.
4. This soft mineral gypsum is used in wallboards, plaster
of Paris (POP). Covering material for interior walls
5. Building gypsum is used as heating resistant
moisture preserving
sound absorbing
fire proofing material
As a building decorative material used in ceiling and partition
projects
6. Fast Setting and Hardening
Micro-expansion
Big Porosity
Poor Water Resistance
Good Fire Resistance
Large Plastic Deformation
7. Gypsum plaster is a time-saving process
Cost of the project is reduced.
Ease of installation and finishing
Easy availability.
8. It doesn't perform well against water.
Costly.
with a limited shelf life.
9.
10. Rubber
A tough elastic polymeric substance made from the lat
ex of a tropical plant or synthetically
There are generally two types of rubber:
1. Natural rubber
2. Synthetic rubber
11. Natural rubber
Natural rubber is an elastic material present
95 percent rubber obtained from the latex of rubber tr
ees.
12. Synthetic rubber
Rubber produced by artificial chemical process is known
as “synthetic rubber”.
Uses
Paints
Rubber gloves
Hammer for tiles
Roads
13. Uses of rubber in construction
materials
Joints, seals and gaskets.
Roofing and flooring.
Pipes and cabling.
15. Advantages of rubber in constructi
on
Temperature resistance.
Flame retardant and low smoke and toxicity.
Absorption.
Environmental resistance
Water resistant.
16. Disadvantages of rubber in constru
ction
Rubber is not the most performance efficient material.
it is higher in cost than silicone
Not long lifespan.
20. types of asbestos:
There are six different types of asbestos:
1.Chrysotile (white)
2.Amosite (brown)
3.Crocidolite (blue)
4.Anthophyllite
5.Tremolite
6.Actinolite
21. Asbestos acts as an insulator.
It is good fire protection properties
Protects against corrosion.
Uses
22. Roofing shingles
ceiling
floor tiles,
paper products
asbestos cement products
Heat-resistant fabrics
Asbestos in building products
23. Thermal insulator
Energy efficiency of the building
Highly resistant to fire
Forms very strong material when mixed with cemen
t
Advantages of Asbestos in Bu
ilding products
24. Seriously hazardous to health.
Asbestos have dangerous invisi
ble micro which can cause life
Disadvantages of Asbestos i
n Building products