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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 heat of hydration and gel space ratio?
Bricks may be broadly classified as following: Paving bricks Building bricks Special bricks A. Fire bricks B. Building Bricks: These bricks are utilized fo
Q. Discontinuity of joint – position of bearing? Expansion joints in a bridge structures cater for movements inlongitudinal, transverse, vertical and rotational forms. Layout a
Determine the quantity of materials required per batch and probable output from a concrete mixing plant of 1200lts capacity. The design per 1000lts of mixed concrete is as follows
Q. What do you mean by Guide bunds? Guide bund may be given an elliptical shape separation of flow can be avoided better with such an alignment. Alternatively straight parallel
The atmospheric pressure is given 680 mm Hg at a certain mountain location of elevation 2000 m. air density is 1.007 kg/m3. Find the pressure in kPa.
why only frustum cone use in slump
Practically the dielectric constant of air is taken as? Answer: The dielectric constant of air is taken as unity.
describe the methods of reducing the levels,and their relative advantages and disadvantages.
Urban Transport Systems: Urban Transport Problem Rapid urbanisation is taking place in India. The current urban population proportion of 28 per cent may reach 40 per
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