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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'.
what is the function of longitudinal joints in concrete road pavements?
pls explain about this field
Design a 10 unit rapid sand filter system for a flow of 6.3 MGD with a filtration rate of 2 gpm/sq ft. and an L: W ratio of 1.3. Design flow (Q) = 6.3 MGD = 6.3x106 gpd =
what are defects in timber occur due to natural causes?
A footing, 2 m square, is founded at a depth of 1.5 m in a sand deposit, for which the corrected value of N is 27. The water table is at a depth of 2 m from the surface. Verify the
Question In designing of watermain , regular practice is to use supple iron for pipe size less than 600mm and to use steel for pipe size additional than 600mm. Give some speci
What is 'contact pressure'? How does it depend on the type of structure and type of soil? What is 'active zone' in soil? Define it with reference to the pressure bulb concept.
describe setting out right angle at given point on a chain line and when the point lies outside the chain line
Explain the Column Effective Length 1. For a single column, the effective length is simply the unbraced length * the k factor: 2. When comparing an effective length fo
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