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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'.
Physical Tests on Cement (a) Soundness Test: by sieve analysis, it is conducted. 100 gms of cement is taken and sieved throughout IS sieve No. 9 for fifteen minutes. Residue on
i want to know about the detailing at beam -column joint & beam- wall joint
State the algebraic equations showing the variation of safe bearing capacity of soil (for clay and sand to be given separately) in shallow foundation with: (i) depth of foundati
Enumerate the term - superposing the stress variations If the case of concentric pre-stressing is considered, we can appreciate that stress at any section of the beam is compr
reason for delay
Q. Purpose of using capping layers in pavement construction? When California Bearing Ratio of subgrade is checked to be below a specific percentage (for example 5%), a capping
A building was to be constructed on a clay stratum. Preliminary analysis showed a settlement of 60 mm in 6 years and an ultimate settlement of 250 mm. The average enhance of pressu
Determine the term - lowering of stresses Due to creep of concrete, these compressive strains keep on increasing with time. it means that the length of the member keeps on red
Design of beam
How is corrosion perverted...?
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