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Bitumen grades are 30-40,60-70, 80-100. what is mean by 30-
40
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Answer Posted / abir kumar ghosh
30-40 means bitumen having penetration of a needle between
30-40 mm with standar weight on it at 25 deg Centigrade.
Lower the penetration is higher the viscosity.
The test is done with the apratus called Vicats apparatus.
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