Types of Bitumen
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Blown Bitumen:
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Produced by blowing hot air into pure bitumen during the final stage of refining.
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This process increases its oxidation, making it more suitable for roofing and industrial applications due to its higher softening point and greater resistance to extreme temperatures.
2 Mixed or Solution Bitumen:
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Created by dissolving bitumen in solvents.
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This makes it easier to apply and useful in cold applications like road construction.
Key Characteristics of Bitumen:
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Viscoelastic and Waterproof: These properties make bitumen ideal for asphalt pavements, providing durability and resistance to water damage.
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Composition: Primarily composed of carbon and hydrogen, with small amounts of nitrogen, oxygen, sulphur, and trace metals.
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Natural vs. Refined: Bitumen can occur naturally (like in lake deposits) or be refined from crude oil.
Bitumen is used extensively in road construction, roofing, and waterproofing due to these properties.
3.Emulsion Bitumen:
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Bitumen is emulsified in water with the help of surfactants.
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This is commonly used for road construction because it allows easier handling and application, especially in colder conditions.