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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'.
Classification Based on Grading: IS 883-1970 classifies the structural timber into 3 grades-select grade, grade I and grade II. The classification is depend on, defects, permi
Q. Joint continuity influenced by inclined bridge deck? Bearings are generally designed to sit in a horizontal plane so as to avoid the effect of extra horizontal force and une
ratio of moorum and aggregate
Sketches for English bond, Stretcher bond, Header bond, Flemish bond in first & second layer plan, elevation and 3 dimensional view of brick bond.
State the term Axial Prestressingin Concrete If the centroid of cross-sectional areas of tendons is at the location of the centroid of the cross-section of the concrete member,
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Details of a simply-supported beam are given in Figures (a) and (b). Note that the dead load, g includes the self weight. Design the transverse shear reinforcement in ter
procedure
A circular footing rests on a pure clay with qu = 270 kN/m 2 , at a depth of 1.8 m. Verify the diameter of the footing if it has to transmit a load of 720 kN. Suppose the bulk u
chaining on level surface
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