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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'.
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What is Initial Prestress From the transfer stage, tensile stresses in tendons apply compressive stresses in concrete. The initial value of these stresses (in tendons or in co
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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
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Q. What is Critical steel ratio? Critical steel ratio - only consider 250mm of concrete from outer face The purpose of critical steel ratio is to control cracking pattern
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