Question
Download Solution PDFWhich of the following tests is commonly used to measure the softening point of bitumen?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Softening Point:
- The softening point is measured by the ‘Ring and Ball’ test.
- The softening point is the temperature at which bitumen attains a particular degree of softness under standardized test conditions.
- The temperature at which a standard steel ball placed on a layer of bitumen kept in a standard ring passes through the bitumen layer and touches the bottom plate kept at a distance of 2.54 cm is the softening point.
- As a result of oxidation, the hydrogen atom in a bituminous hydrocarbon is combined with atmospheric oxygen, and polymerization takes place along with the formation of water.
- It has a higher softening point and lower susceptibilities to temperature.
Additional Information
Various tests conducted on bitumen for testing its various properties are as follows:
|
Test on Bitumen |
Properties to be tested |
Desirable Value |
|
Ductility Test |
Ductility (Briquettes Apparatus) |
less than 75 and greater than 50 |
|
Flash and Fire Point Test |
Flash Point and Fire Point (Pensky-Martens Closed Tester) |
greater than 175° |
|
Float Test |
Consistency |
|
|
Penetration Test |
Hardness or Softness of Bitumen |
30/40, 60/70, and 80/100 |
|
Specific Gravity Test |
Specific Gravity (Pycnometer) |
1.01 to 1.03 |
|
Water Content Test |
Water Content |
Lesser than 2% |
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