If You Are A highway engineer or working in any highway ,roads project then you are at right page and you must know the Difference between Asphalt and Bitumen an
What is the difference between asphalt and bitumen , Today we will discuss in details that what is the difference between asphalt and bitumen like temperature at production , density of materials, percentage of sand stone, aggregates and sand in Asphalt and bitumen, percentage of binder in asphalt, density of bitumen, volume , definition ,etc.
1).What is Asphalt
Asphalt is basically a composite mix of sand, aggregates or Stone dust or bitumen which is bind by bitumen so bitumen is a binder.it is termed as Asphalt. Asphalt is mostly used in road construction, it is differ for different types of works it means for different types of works the viscosity of bitumen is different.
95% Stone dust,sand aggregates.
5% bitumen as a binder.
At mixing time of all ingredients in plats sandstone, dust, aggregates the temperature is about 150 to 190 degree Celsius.
4). Density of asphalt
Density of Asphalt 2330 kg/m3,145 pound/cft.
5). Size of aggregates
If we required less flexible pavements than we will use large size aggregates they varies between 10 to 14mm.
And if we want more flexible pavements than we will use small size aggregates they vary between 5 to 10mm.
Now, Lets Discuss About Bitumen
Bitumen is a common binder used in road construction. Bitumen is a Liquid binder which holds the asphalt together. It is highly viscous and sticky black material .what do you mean by viscous it means it is free from any motion ,it is a thick paste and one important things to remember in north America asphalt is also define as bitumen.
Bitumen is a composition of (partially hydrogenated poly-cyclic aromatic compound it is also known naphthalene c10 h8.
4).Boiling point of bitumen
525 degree Celsius.
So, These are the basic Difference between Asphalt and Bitumen.
Re asons to use bitumen in road construction
1). Production of bitumen is Economical.
Because it is a bye product of crude oil distillation process, crude oil is itself is a composition of hydrocarbons. The primary products that are available are the petrol, diesel, high octane fuels and gasoline. When these fuels are refined from the crude oil, the bitumen is left behind. Further treatment of by-product is done, to make it free from impurities give pure bitumen. As the primary product demand is of utmost importance to the society, the bitumen as a by product has survival for long. This by product is utilized as a new construction materials, without going for any other new resources.
2). Physical and Rheological properties of bitumen bring versatility.
The physical and the chemical properties of bitumen are found to be a function of load level, Temperature and the duration of loading. It is thermoplastic and visco elastic material.
These dependencies make us to truly access the traffic on the road, So that a bitumen mix properties can be varied based on the stress levels calculated. This versatility of bitumen results in a large variety of bitumen mix, based on the road application.
3). The melting point of bitumen is low.
It is Highly appreciable about the fact that bitumen has a favorable melting point, that helps in both surface dressing and wearing resistance with ease. The melting point of bitumen should not be too high, that it can be melted easily during laying the pavement. At the same time, bitumen has a melting point, which would not let the already casted road pave to melt and deform under high temperatures.
In areas of high temperatures, along with this quality of bitumen, the aggregates composition helps to cover up the effect of large temperature.
4). Bitumen can undergo recycling.
As the melting point of bitumen is favorable, it can be melted back to its original state. This is called as asphalt recycling process. The torn – up asphalt pieces are taken up to the recycling plant, instead of sending them to landfills. This recycled mix can be reused. If necessary the old bitumen is mixed with new bitumen and new aggregates to make the mix, live again.
5). Bitumen gain Adhesive Nature
As explained in the production of bitumen, It is free from the hydrocarbon and hence not toxic. The by-product is refined to maximum to get rid of organic materials and impurities.
The bitumen has a highly adhesive in nature, which keep the materials in the road mix bind together under strong bonds. These become stronger when the mix is set i.e. ready for vehicle movement.
6). Bitumen has color variety
The traditional bitumen is black in color. This is because the dense material within bitumen is black in color.
Now, when certain pigments are added to bitumen, the color of our choice can be obtained. These are called colored bitumen. It is costly than the normal bitumen.
The disadvantage of colored bitumen is that requires more chemical additives and materials.
Field Test of Bitumen | Test of Asphalt | Field Test of Asphalt
How to check bitumen at site without laboratory
Field Test of Bitumen Methods are following :-
1). Check Bitumen Odour or Smell
1). Odour of bitumen is similar to lubricating oil. It is generally smell like lubricating oil which is used In machines to reduce friction and increase the speed or working process of machines like diesel grease, etc.
2). Mix the bitumen with either Petrol , kerosene or diesel, if it gives uniform dark color liquid than it means it is suitable for our road construction.
So, These are the difference between asphalt and bitumen. I Hope this article will be useful for you all.Thanks for your great attention to read this post.Hoping you enjoy
Happy Learning 😆
Also Read :-