Viscosity Bitumen

Generally speaking, viscosity bitumen grade is a substance suitable for

street paving, road construction and the asphalt pavement industry, especially

in areas such as India. Technically speaking,

Also , viscosity bitumen is mainly in the production of hot mixed asphalt for road paving, insulation and

the production of liquid bitumen. By combining the viscoelastic reaction

of bitumen with other materials, very flexible and viscous joints will appear

which depends on the speed at which the reaction applies. In the following,

we discuss more the viscosity bitumen grades production,

specifications, types such as VG 30, VG 40, VG 10 and other details.


Types of bitumen


Production and manufacturing viscosity bitumen grades

Important to know that viscosity bitumen, which is often a refinery bitumen,

is from vacuum aeration of the distillation tower, while refinery bitumen is

from the vacuum pulp of raw materials, which depends on the temperature

of bitumen. It’s also essential to know that bitumen in road construction if

it is from the mine, it is natural or mineral bitumen, and if it is from the refining

of crude oil, it is petroleum or refinery bitumen. To be more specific,

when crude oil volatiles in the depths of the earth evaporates overtime

against atmospheric agents, a black substance, which is natural bitumen, remains.

Natural bitumen includes rock bitumen and lake bitumen as follows:

In general, the bitumen types are all a type of natural bitumen. Besides,

bitumen is mainly limestone and sandstones into which crude oil has

penetrated and over time its volatiles has evaporated and bitumen remains

in these rocks. After crushing and softening, the bitumen heats and spreads

on the road surface. As a matter of fact, the amount of bitumen in rock

bitumen varies from 7 to about 80%. Good to know that bitumen dissolves

in mineral oils and solvents such as carbon sulfide, carbon tetrachloride

and ethylene trichloride.

What are the applications of viscosity bitumen grades?

The use of viscosity bitumen in road construction is not cost-effective

compared to the abundance of petroleum bitumen due to the high costs

of extraction and transportation, non-uniformity of constituents and the

variable amount of bitumen in them. Of course, future research can help

exploit and consume them in the road construction industry. Not to become puzzled, let’s discuss lake bitumen more.

Lake bitumen from a variety of natural bitumen

When crude oil naturally rises to the surface through the failed layers of the

earth and its volatiles evaporate, natural bitumen appears as a lake on the earth. Besides, lake bitumen resources are in most parts of the world, including

the Middle East. In fact, these resources are available in Iran, Poshtkuh,

Kharameh Fars and other regions of the country.

Types of petroleum bitumen in road construction

On the contrary, to the abovementioned, petroleum or refinery bitumen is

usually by refining crude oil in distillation towers, and ultimately what remains

at the bottom of the distillation tower is pure petroleum bitumen. Moreover,

bitumen types with different degrees of hardness for different road

construction use can be by adjusting the temperature and pressure inside

the distillation towers as well as aeration. Note that the bitumen from

crude oil refining is according to the type and conditions of their use

in road construction:

Pure bitumen from a variety of petroleum bitumen types

As you know, bitumen types that are directly from the refinery vacuum in

the something briefly exposed distillation tower or to the aeration process

are under the title of pure bitumen types. It’s important that these bitumen

types should be homogeneous and free of water and should not foam at 176 ° C.

In addition, pure bitumen types deform into a thick, watery liquid due to heat

and are elastic at low temperatures. As the last point, pure bitumen in

road construction divides according to penetration and performance.

Also , The technical specifications of bitumen for each project, depending on whether

they are bitumen with penetration or performance, should be clear in

the private technical specifications of the project.

Blown bitumen from various types of petroleum bitumen

So , Pure bitumen types pressurize to 200 to 300 ° C to combine all the hydrogen

in the bitumen molecules with oxygen in the air, and by creating

polymerization reactions, heavier hydrocarbons obtain that have a

lower penetration and a softer point than primary pure bitumen. In the Middle East,

two types of blown bitumen are 25.85 and 15.90, the numbers of 25

and 15 degrees of penetration and the figures of 85 and 90 are their soft points.

Soluble bitumen from various types of petroleum bitumen

The type and quality of soluble bitumen depend on the quality of the original

pure bitumen, the type and the amount of solvent. To put it differently,

the higher the number of petroleum solvents in the dissolved bitumen,

the greater its fluidity. In addition to above, the percentage of solvent

insoluble bitumen usually varies from 20 to 50%. Soluble bitumen is in

road construction for surface coatings, infiltration, surface asphalt,

cold factory asphalt, or mixed asphalt on-site, etc. Types of soluble

bitumen classifications are three major groups according to the set s

peed and the type of solvent.

  • Instant soluble bitumen (RC)
  • Solution bitumen (MC)
  • Retardant Soluble Bitumen (SC)

To sum up, VG30, VG40, VG10 viscosity bitumen are more suitable for

temperate climates.

But , In the classification based on the viscosity of

bitumen according to the absolute viscosity at 60 ° C or kinematic viscosity at

135 ° C, classification and specific technical criteria have been determined

for each of them. Absolute viscosity is clear in terms of motion

and kinematic viscosity.

To summarize, recycling asphalt pavement decreases construction expenses

as well as environmental depravity. Therefore, adding the bitumen emulsion

as a rejuvenator in aged and oxidized asphalt binder enhances its viscosity

and rigidity without significantly lowering the carbonyl ratio.