What is the softening point of bitumen?
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 20 | 45 °C |
| VG 30 | 47 °C |
| VG 40 | 50 °C |
How do you find the softening point?
The softening point is obtained as the temperature at which the mercury drop breaks through the softening resin and falls. Mettler softening point method — ASTM D 3461-76. This is the most recent method. This automatic method measures the temperature at which the resin flows out of a sample cup under its own weight.
Which test is used to determine softening point of bitumen?
Ring and ball test is used to determine the softening point of bitumen, asphalt and coal tar. This test consists of two brass ring and two steel ball, using which the softening point of various bituminous materials are determined.
When the softening point of bitumen tested is 30 to 40 degree Celsius then grade of bitumen is?
Specification of Bitumen Penetration Grade 30/40
| Bitumen 30/40 | Test method | Specification |
|---|---|---|
| Penetration @ 25°c | ASTM D5 | 30/40 |
| Softening point °c | ASTM D36 | 55/63 |
| Ductility @25 °c | ASTM D113 | 100 min |
| Loss on heating(wt) % | ASTM D6 | 0.2 max |
How do you soften bitumen?
Bitumens are viscoelastic materials without sharply defined melting points; they gradually become softer and less viscous as the temperature rises. The softening point of bitumen can be determined through the use of a ring-and-ball apparatus immersed in distilled water (30 to 80°C) or USP glycerin (above 80 to 157°C).
How do you soften hard bitumen?
The system is placed in a water bath and heated. The temperature at which a steel ball with a bitumen coating hits the bottom of a glass beaker is called the softening point temperature….Ring and Ball Test.
| Paving grades | Softening point ( °C) |
|---|---|
| VG 40 | 50 °C |
What is the melting point of bitumen?
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 ring and ball softening point?
The ring-and-ball softening point is defined as the temperature at which a disk of the sample held within a horizontal ring is forced downward a distance of 1 in. (25.4 mm) under the weight of a steel ball as the sample is heated at a prescribed rate in a water or glycerol bath.
What is the meaning of 60 70 bitumen?
The penetration of Bitumen is used to measure its grade. It is reported as a penetration value of mm/10. Bitumen penetration grade 60/70 means the penetration value is in the range 60 to 70 at standard test conditions which commonly used as a Paving Grade.
What is the difference between VG10 and VG 30?
The difference between VG10 and VG30 The difference between VG10 and VG-30 bitumen is in their viscosity level. Bitumen VG30 is more viscose than bitumen VG 10 and as a result, performs better in road construction in hot regions.
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.
What do you mean by softening point?
: the temperature or range of temperatures at which a substance softens.
How is the softening point of bitumen determined?
Scope 1.1 This test method covers the determination of the softening point of bitumen in the range from 30 to 157 °C [86 to 315 °F] using the ring-and-ball apparatus immersed in distilled water [30 to 80 °C] or USP glycerin (above 80 to 157 °C). 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard.
Which is the standard test method for softening point of asphalt?
ASTM D3461-18, Standard Test Method for Softening Point of Asphalt and Pitch (Mettler Cup-and-Ball Method), ASTM International, West Conshohocken, PA, 2018, www.astm.org
What is the melting point of a bituminous binder?
2. melting point is the temperature at which the bituminous binders have an equal viscosity (i.e. the consistency of all the grades will be same at the softening point e.g. if two samples have softening points of 30 °C and 80 °C respectively, both will have the same consistency at their softening point.).
What is the purpose of the softening point test?
1. This method is useful in determining the consistency of bitumen as one element in establishing the uniformity of shipments or sources of supply.