What is the softening point of bitumen?
What is the softening point of bitumen?
The softening point of various bitumen grades generally lies between 35°C to 70°C. Softening point of bitumen to be used for road construction at a place where the maximum temperature is 40°C should be greater than the 40°C.
What is bitumen melting point?
Bitumen has a melting point of around 240 degrees Fahrenheit which is high enough to be safely used for roadway designs and low enough to be heated up without using a large amount of energy.
What is meant by softening point?
Definition of softening point : the temperature or range of temperatures at which a substance softens.
What is high softening point?
The softening point is the temperature at which a material softens beyond some arbitrary softness. It can be determined, for example, by the Vicat method (ASTM-D1525 or ISO 306), Heat Deflection Test (ASTM-D648) or a ring and ball method (ISO 4625 or ASTM E28-67/E28-99 or ASTM D36 or ASTM D6493 – 11 or JIS K 6863).
How is softening point measured?
The softening point value of the two readings should not exceed 1.0 °C for the softening point of bitumen range 40-60 °C and 1.5 °C for the softening point between 61-80 °C. Else the test is considered invalid and it is repeated….Result.
| Paving Grades | Softening Point |
|---|---|
| VG 30 | 47 °C |
| VG 40 | 50 °C |
Why do we test softening point?
The determination of softening point helps to know the temperature up to which a bituminous binder should be heated for various road use applications. Softening point is determined by ring and ball apparatus.
How can the softening point of bitumen be increased?
Introduction of polymers significantly increases softening point of bitumen. Softening point increase with increasing Polydom content is linear and at 3 % it is up to 10 °C and at 4 % – 12 °C.
How do you test a softening point?
What are the factors that influence the result of the softening point test?
Therefore, the softening point is controlled by the average molecular weight of the resin. The softening point is also related to the intrinsic viscosity, hardness, and brittleness of resins.
Why do we use softening point?
Uses of Softening Point The determination of softening point helps to know the temperature up to which a bituminous binder should be heated for various road use applications. Softening point is determined by ring and ball apparatus.
