Bitumen grades are 30-40,60-70, 80-100. what is mean by 30-
40
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Answer Posted / ujjawal u. d.
the penetration caused by standard Condition i.e.
Standard Weight= 100 gm
Standard temp. = 25 Degree C.
Standard penetration time = 5 Seconds
Unis = 10th of mm to show the results and avoiding Errors
e.g. if the value is 30/40, the 30/40 is the bitumen
penetration value (tested in standard condition) lies
between 3 to 4 mm.
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