materials overview asbestos asphalt.pptx

Ppt about asbestos and asphalt and its uses from a material point of view

1. ASBESTOS IS A NATURALLY OCCURING FIBEROUS MINERAL SUBSTANCE MADEUP OF HYDROUS SILICATES OF CALCIUM AND MAGNEISUM .IT ALSO CONTAINS SMALL AMOUNT OF IRON OXIDE AND ALUMINA. ASBESTOS

2. ASBESTOS CAN BE DIVIDED INTO TWO GROUPS ACID RESISTANCE ASBESTOS NON-ACID RESISTANCE ASBESTOS PROPERTIES OF ASBESTOS ITS MOLECULES ARE STRONGLY BOUND TOGETHER ONLY IN ONE DIRECTION THAT IS WHY IT ACHIVED HIGH TENSILE STRENGTH. IT IS BROWN , GREY OR WHITE IN COLOR. IT IS FIRE PROOF AND ACID PROOF. IT IS FLEXIBLE SOFT AND NON PORUS. IT IS SMOOTH LIKE GLASS AND SILK IT IS AN EXELLENT INSULATOR FOR HEAT AND ELECTRICITY. ITS MELTING POINT IS 1200* TO 1550* CELCIUS

3. USES OF ASBESTOS IN BUILDING MATERIALS ASBESTOS FIBERS MIXED WITH CEMENT AND FINE SAND FOR MAKING CORRUGATED ROOFING SHEETS AND CEMENT PIPES FOR THE RAIN WATER AND SEPAGE WATER. IT IS USED FOR DAMP PROOF LAYER WHEN IT MIXED WITH BITUMEN AND ASBESTOS FELT. IT IS USED AS INSULATING MATERIAL IN FURNACES AND BOILERS. IT ALSO USED FOR MAKING ROPES. IT IS USED TO FORM A ASBESTOS PAINTS.

4. ASBESTOS CEMENT SHEETS

5. ASPHALT ASPHALT IS A MECHANICAL MIXTURE OF ALUMINA , LIME , SILICA AND ASPHALTIC BITUMEN .IT IS BROWNISH BLACK IN COLOR.

6. TYPES OF ASPHALT THERE ARE TWO TYPES OF ASPHALT : NATURAL ASPHALT AND RESIDUAL ASPHALT . NATURAL ASPHALT : OBTAINED FROM LAKES IT CONTAINS 4O TO 70 % OF PURE BITUMEN. RESIDUAL ASPHALT : OBTAINED FROM FRACTIONAL DISTILATION OF CRUDE PETROLEUM OILS WITH AN ASPHALTIC BASE.IT IS ALSO KNOWN AS ARTIFCIAL ASPHALT.

7. PROPERTIES OF ASPHALT IT IS TOUGH AND DURABLE BULILDING MATERIAL. IT ALSO USED AS A WATER PROOFING MATERIAL. IT IS GOOD INSULATOR OF ELECTRICITY HEAT AND SOUND. IT IS NON INFLAMMABLE AND NON ABSORBENT IT IS NOT ATTACKED BY ACIDS. IT IS ELASTIC IN NATURE. FORMS OF ASPHALT 1.ASPHALTIC CEMENT 2. ASPHALTIC EMULSION 3. CUT BACK ASPHALT 4. MASTIC ASPHALT

8. USES OF ASPHALT WATER PROOFING PAINTS AND ROOFING FELTS DAMP PROOF COURSES ROADS