Why do we use bitumen in road construction?

Bitumen is a material obtained by fractional distillation of crude petroleum as an end product. Bituminous materials were used for the construction of roads, preserving timber and for waterproofing stone walls. Nowadays, they are extensively used for surfacing of road and airport pavements.

Why is bitumen used in road construction instead of coal tar?

The weathering properties of bitumens are superior to those of tars. Generally greater deterioration is produced in tar than in bitumen when exposed to equal weather conditions. Bitumens have a better durability and resistance to weathering than tars.

Why Bitumen is used?

37.1. 1 Applications. Bituminous materials are used for road construction, roofing, waterproofing, and other applications. For the main application, which is road construction, the major concerns, as with concrete, are cost and durability.

What are the uses of bitumen in construction?

A further 10% of global bitumen production is used in roofing applications, and the remaining 5% is used mainly for sealing and insulating purposes in a variety of building materials, such as pipe coatings, carpet backing, joint sealants and paint.

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What are the three types of bitumen?

Different Types of Bitumen, their Properties and Uses

  • Penetration Grade Bitumen.
  • Oxidized Bitumen.
  • Cutback Bitumen.
  • Bitumen Emulsion.
  • Polymer – Modified Bitumen.

Why is bitumen black?

Traditional asphalt bitumen is black because of the dense organic material that makes up the material. It is more expensive than regular asphalt bitumen because there is less of its pigmentable counterpart produced during crude oil distillation, and it requires more materials and chemical additives to make.

Is bitumen same as tar?

The two substances are very similar and sometimes the terms tar and bitumen are used interchangeably. Bitumen can be naturally occurring whereas tar usually has to be artificially distilled. Also, Bitumen occurs in both solid and liquid forms whereas tar is generally always a viscous liquid.

Is coal tar used for surfacing roads?

Abstract. Coal tar is a ready source of asphaltenes needed in asphalt production. Coal tar pitch itself, however, is unsuitable for making road -paving asphalt, since the resulting material has low ductility, high temperature sensitivity, and low resistance to wear.

Is coal tar used in roads?

Coal tar: It is obtained as a by-product during the production of coal gas, by heating coal in closed iron vessels to form coke. Coal tar is mostly used for road works. Wood tar: It is obtained by distillation of pine wood and other resinous wood.

Which bitumen does not need heat?

Which bitumen does not need heating? Explanation: The cutback bitumen which is the most economical type may or may not require heating, whereas the remaining required to be heated.

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Where is bitumen used?

Bitumen is commonly used to build highways, motorways and rail networks. Bitumen has excellent water-proofing properties and is widely used for making roofing products along with a range of other household and industrial applications, from emulsion paints to sound-proofing.

What is bitumen grade?

The penetration is measured in mm and it indicates the relative hardness of the bitumen. Higher the penetration, softer is the bitumen. A penetration of 0.6 to 0.7 mm indicates 60/70 penetration grade bitumen. Various viscosity grades of asphalt cement ( bitumen ) were evolved as AC-30 Grade, AC-20 Grade and AC-10 Grade.

What is bitumen and uses?

Mainly, it serves its use in paving and roofing applications. 85% of all bitumen is used as a binder in asphalt for roads, runways, parking lots, and foot paths. Gravel and crushed rock are mixed with thick bitumen, holding it together and it is then applied to roadways.

What are the sources of bitumen?

Bitumen used in South Africa is obtained as an end product of the petroleum crude oil refining process. As a binder, bitumen is especially valuable to the engineer because it is a strong, readily adhesive, highly waterproof and durable material.

How much bitumen is used in road construction?

Approx. 3.5% to 5% bitumen is normal content for road construction.

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