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Question
```Bitumen grades are 30-40,60-70, 80-100. what is mean by 30-
40```
Question Submitted By :: Civil-Engineering
I also faced this Question!!     Answer Posted By

# 1
IT MEANS IT HAVING THE PENETRATION VALUE BETWEEN 30 TO 40
 Is This Answer Correct ? 52 Yes 13 No

# 2
yes, and the unit is (0.1mm) ..
e.g: 80 = 8mm = 0.8cm

 Is This Answer Correct ? 39 Yes 5 No
Tawalbeh

# 3
the needle denotes in 1/10th 's ofmm....so it mean 3mm to 4 mm
 Is This Answer Correct ? 17 Yes 2 No
Venky

# 4
the rage 30-40 means the bitumen has having grades between
these two valus and and it is determined by average
peneteration value of the test which conducted by the
instrument called penetrometer.

 Is This Answer Correct ? 13 Yes 1 No
Anwar_eng04

# 5
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.

 Is This Answer Correct ? 18 Yes 8 No
Abir Kumar Ghosh

# 6
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.

 Is This Answer Correct ? 10 Yes 2 No
Ujjawal U. D.

# 7
30-40 means bitumen having penetration of needle (with
standard weight)between 30-40 mm in 5 seconds at 25 deg
cent.
The test done with a apratus called Vicats apparatus.

 Is This Answer Correct ? 11 Yes 4 No
Abir Kumar Ghosh

# 8
penetraion is 30 t0 40 mm by 25 deg tem
 Is This Answer Correct ? 5 Yes 0 No
Bhuwan

# 9
Penetration value (tested in standard condition) lies
between 3 to 4 mm.

 Is This Answer Correct ? 3 Yes 0 No
Hossain

# 10
30-40 means bitumen having penetration between 30-40 mm .
The test done is called bituminous penetration test ,
machine used is vicats apparatus.

 Is This Answer Correct ? 17 Yes 15 No

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