Presented By:Presented By:

Engineer LATIF HYDER WADHOEngineer LATIF HYDER WADHO

Mehran University of Engineering & Technology Mehran University of Engineering & Technology Khairpur Mir’s.Khairpur Mir’s.

Civil Engineering MaterialsCivil Engineering Materials

11stst Term 1 Term 1stst Year B.E.Civil Year B.E.Civil

ASBESTOS

ASBESTOS:It is a silicate mineral with the composition of silicate of calcium and magnesium .

The main characteristics of Asbestos are as under:1. It is commonly of white or whitish grey colour.2. It has the typical fibrous form (in the form of 3. fibres).4. Its fibres show a silky shine or luster.5. The fibres are flexible and can be interwoven.6. It is highly resistant to heat and is fire proof.7. It is an excellent heat, sound and electric

insulator.8. It has high resistance to corrosion.9. It has a high melting point (12000C to 15000C).

It is widely used in several forms for heat, sound and electrical insulation works such as sheets, boards, pipes and loose filling material, etc because of above mentioned notable characteristics. It is also used for the making of Asbestos Cements, fire proof ropes and cloth.

Asbestos Products:Following are the main products of Asbestos:

1. Asbestos Cement Sheets (A.C.Sheets),2. Asbestos-Cement Pipes,3. Asbestos Paints,4. Asbestos Paper, etc.

Gypsum:• Gypsum is the mineral with the composition of

hydrated calcium Chloride (CaSO4.2H2O). It is a soft mineral with low density and good binding power. It dehydrates on heating. Further on coming in contact with water, it combines with it again. It is extensively used as filler in paint, paper and rubber industry. It is used as retarder in cement manufacturing. It is also used for the manufacturing of Plaster of Paris (Gypsum Plaster).

• Gypsum Plaster is used for decorative plaster of all kinds.

Developed by:Nadeem Asghar 9

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