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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'.
fabrication methods of ironmongery
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
What practical steps can one take to mitigate the adverse effects in using aggregates with higher than specified flakiness index in the production of concrete
Relation of the angle of contact between pipe invert and bedding material to the load resisting capacity of pipe Minimum crushing strength is a generally adopted parameter for
h = u + pv is a combination of properties and hence must also be a property. h is the SPECIFIC ENTHALPY in kJ/kg H = U + pV is the ENTHALPY in kJ
4. Calculate the loose volume of material needed to fill in the trench as sketched below. The following information is also known: [7] o Length of trench = 250 m o Trench
Tendon splices Tendon splices are used to join tendons when continuous prestressed concrete , members require long tendons to achieve continuity. Several types of tendon splic
Explain the Strength Design (LRFD) 1. γ Factors are applied to loads and φ factors applied to resistance. 2. Unfactored service loads receive a load factor γ > 1.0
what is the waste utilisation?
Steel triangulated (open web) girders are provided with camber to compensate for deflection under load. Out of the total design camber, the part corresponding to dead load is calle
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