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An elastomer is a polymeric substance obtained after vulcanization of rubber. Vulcanization is the process of improving the properties of rubber by heating with sulphur. A normal rubber is not useable as it becomes brittle at low temperature and sticky at high temperature. Charles Goodyear had been trying to 'cure' the rubber so that it could be used in all seasons. He tried to mix all kinds of things such as ink, black pepper, cheese and what not. But he couldn't succeed until he dropped a piece of rubber on stove accidentally.
To his surprise, he found that instead of melting the rubber piece hardened and remained pliable. It was found in the lab that it contained traces of sulphur. Goodyear perfected the process and named it 'vulcanization' after the Roman God of fire, 'Vulcan'.
Abrasion Test: This test is carried out on stones used as aggregates for road construction. The test result shows the suitability of stones against the grinding action u
Sealing moving cracks and non-moving cracks In developing a suitable method to seal up cracks detected on concrete surface, it's of paramount importance to conclude if further
A retaining wall, 4.5 m high, retains a soil with c = 2 N/cm 2 , φ = 30° and g = 20 kN/m 3 , with horizontal surface level with the top of the wall. The backfill carries a surch
Q. Illustrate Layout of corrugated beam barriers? Layout of corrugated beam barriers is that the beams are corrugated in the longitudinal direction so as to it provides higher
what is the errors faced in leveling
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A retaining wall 9 m high retains granular fill weighing 18 kN/m 3 with level surface. The active thrust on the wall is 180 kN per metre length of the wall. The height of the wall
A footing foundation for a water tower carries a load of 9000 kN and is 3.6 metres square. It rests on dense sand of 9 m thickness overlying a clay layer of 3 metres depth. The cla
Q. How to determine the frequency of flood? Flood frequency may be estimated preferably from flood records, if available, for a number of years or they may be based on rainfall
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