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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'.
Shrinkage of concrete in prestressed members The shrinkage of concrete in prestressed members results in a shortening of ensioned wires and hence contributes to the loss of st
definition for double type scaffolding
Preliminary settlement analysis for a building indicated a settlement of 50 mm in 4 years and an ultimate settlement of 250 mm. The average pressure increment in the clay stra
The loading period for a building extended from Feb., 1957 to Feb., 1959. In Feb., 1962, the average measured settlement was found to be 117 mm. The ultimate settlement was expecte
What is Polymer Concrete?
Explain the Design Criteria Sedimentation basin Surface Loading rate (or overflow rate), Vo = Q/A (flow rate/surface area) Detention time t or ? = V/Q (Volume /Flow rate)
why converjent angle is greater than disconverjent angle
centroid of shaded area
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Q. Show the Settlement due to Excavation? If an excavation is made in a sandy soil, the structure founded near the excavation will be affected and it will cause extra settlem
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