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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'.
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
Properties of Ordinary Portland Cement (i) Chemical properties: Portland cement consists chemical compounds are following: (a) Tricalcium silicate 3 CaO.SiO 2 (C
A retaining wall, 6 m high, retains dry sand with an angle of friction of 30° and unit weight of 16.2 kN/m 3 . Verify the earth pressure at rest. If the water table rises to the to
Q. Explain about Catch Sidings? Normally all catch sidings except those which are sanded shall be kept alive. On sanded catch siding, the rails shall be kept clear of sand for
Review of available Records - Preparation for Underwater Inspection? Before taking up the underwater inspection, a detailed review of drawings and past report should be carried
plz tell me the ratio of sand,aggregate,and asphalt.pl tell me the mm of aggregate
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uses of chemical prestressing
Question General requirement for Civil Engineering Works in 1992 Edition, Clause 15.09 details that tying wires for strengthening adjacent to and above Class F4 and F5 closes must
Ask question #Minimum 100E. The regulations and specifications that followed for compaction works for earth dam in Oman words accepted#
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