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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'.
A group of 16 piles of 50 cm diameter is arranged with a centre to centre spacing of 1.0 m. The piles are 9 m long and are embedded in soft clay with cohesion 30 kN/m 2 . Bearing r
Produce a manual determination to determine the instantaneous rate of heat loss (kW) through one part of the fabric (eg roof, glazed area, wall) based on an internal building desig
Sealing moving cracks and non-moving cracks In developing a suitable method to seal up cracks detected on concrete surface, it's of paramount importance to conclude if further
Q. Necessity of air voids in bituminous pavement? If the presence of air voids is too high, it results in an increase of permeability of bituminous pavement. This enables the f
influence diagram with example
#how to prepare pre packed concrete#
Question While designing water storage tank , has movement joints be installed? Answer While designing water storage tanks , group joints can be set up in similar w
Will going from a 3-tap to 6-tap increase water pressure? Ans) No, the pressure will be the similar, you will get more volume only if your pumps can handle the GPM, to enhance p
Q. Optimum binder content in bituminous pavement? Amount of binder to be added to a bituminous mixture can't be too excessive or too little. Principle of designing the optimum
interplanar spacing
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