Gypsum & asbestos
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The document discusses the characteristics and uses of asbestos and gypsum. It describes asbestos as a silicate mineral composed of calcium and magnesium silicate. It has fibers that are flexible, fireproof, and act as excellent insulators against heat, sound, and electricity. Asbestos is widely used for insulation in sheets, boards, pipes and as a loose filling. Common asbestos products include cement sheets, pipes, paints and paper. Gypsum is also discussed as a mineral composed of hydrated calcium sulfate that is soft with low density and good binding properties. It is used as a filler and retardant in various industries and to manufacture plaster of paris.
Gypsum & asbestos
- 2. Presented By:Presented By: Engineer LATIF HYDER WADHOEngineer LATIF HYDER WADHO Mehran University of Engineering & TechnologyMehran University of Engineering & Technology Khairpur Mir’s.Khairpur Mir’s. Civil Engineering MaterialsCivil Engineering Materials 11stst Term 1Term 1stst Year B.E.CivilYear B.E.Civil
- 3. ASBESTOS
- 4. ASBESTOS: It is a silicate mineral with the composition of silicate of calcium and magnesium .
- 5. 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 (12000 C to 15000 C).
- 6. 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.
- 7. 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.
- 8. 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.
- 9. Developed by:Nadeem Asghar 9 Thank You
- 10. Developed by:Nadeem Asghar 9 Thank You
Editor's Notes
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