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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'.
Sketch a curve showing the relation among dry density and moisture content for Standard Proctor test and indicate the salient features of the curve. Describe why soils are compacte
Properties of Ordinary Portland Cement (i) Chemical properties: Portland cement consists chemical compounds are following: (a) Tricalcium silicate 3 CaO.SiO 2 (C
define and explain various marine facilities
Q. Location of construction joints? Construction joints are generally required in construction works since there is limited supply of fresh concrete in concrete batching plants
A shaft 9 m long is subjected to a torque 30 t-m at a point 3 m distant from either end. The reactive torque at the nearer end will be?
Prestressed concrete poles In the past decades, prestressed concrete poles have become popular and have replaced the traditional poles made of timber, steel or reinforced con
explanation for damping ration
1
Two load tests were conducted at a site-one with a 0.5 m square test plate and the other with a 1.0 m square test plate. For a settlement of 25 mm, the loads were found to be 60 kN
how can you draw contours of a non square grid?
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