Asphalt Classification of asphalt Forms of asphalt Properties of asphalt Uses of asphalt vedio link https://youtu.be/tNTBher08nA

1. TOPIC
ASPHALT
PREPARED
BY
ER. SANJEEV SINGH
SNJV432@GMAIL.COM

2. CONTENT
• Asphalt
• Classification of asphalt
• Forms of asphalt
• Properties of asphalt
• Uses of asphalt

3. ASPHALT
• The asphalt is a mechanical mixture of inert material matter like
alumina, lime, silica etc. and the asphaltic bitumen.
• It is black or brownish-black in colour.
• It remains in solid state at low temperature and become liquid at a
temperature of about 500
𝑐 𝑡𝑜 1000
𝑐.

4. CLASSIFICATION OF ASPHALT
• Natural asphalt
• Residual asphalt

5. NATURAL ASPHALT
• Natural asphalt: this variety of asphalt is obtained from nature.
Natural
asphalt

6. LAKE ASPHALT
• This asphalt is obtained from lakes at Trinidad and Bermudez ( south
America ) at depth varying from 3 to 60 metres.
• It contains about 40% to 70%of pure bitumen.
• The water content is about 30%. The rest is impurities. It refined by
boiling in a tank.
• The water evaporates and impurities collect at the top. These
impurities are removed.
• This refined lake asphalt is used widely for road and pavement
construction.

7. RESIDUAL ASPHALT
• This variety is also known as the artificial asphalt.
• It is obtained by the fractional distillation of crude petroleum oil with
an asphaltic base.
• Such process leaves a solid substance in the retort. This solid
substance is the residual asphalt.

8. FORMS OF ASPHALT
• Asphaltic cement.
• Asphaltic emulsion.
• Cut-back asphaltic .
• Mastic Asphaltic .

9. ASPHALTIC CEMENT
• It is prepared by blowing air through melted asphalt at high
temperature.
• The asphalt is oxidized and the resulting product is plastic in nature
and it is highly resistant to varying climatic conditions.
• It is used for flooring, roofing, water-proofing and filler in expansion
joints in concrete.

10. ASPHALTIC EMULSION
• It is produced by mixing asphalt with 50 to 60 %water in presence of 1
% of emulsifying agent.
• When water evaporates ,the emulsion breaks and it forms a water
proofing layers.
• It can be applied in cold conditions.

11. CUT-BACK ASPHALTIC
• This is a liquid asphalt. It is prepared by dissolving asphalt in a
volatile solvent.
• It can be applied at normal temperature in cold condition.
• It is used for preparing bituminous paints, for repairing roofs etc.

12. MASTIC ASPHALTIC
• It is produced by heating natural asphalt with sand and mineral
fillers. The resulting product is a voidless impermeable mass.
• The hardness and melting point of mastic asphalt can be controlled
during its manufacture.
• It may either be in solid or semi solid state.
• It is used as a material for damp-proofing and water –proofing.

13. PROPERTIES OF ASPHALT
• It is a tough and durable material.
• It is a water-proof material and used can be easily cleaned.
• It is a good insulator of electricity, heat and sound.
• It is non-inflammable and non absorbent.
• It is not attacked by acids and is safe against vermin.
• It is resilient and reasonably elastic.

14. USES OF ASPHALT
• As damp-proof courses.
• As water – proof layer for tanks, basements, swimming pools etc.
• For preparing paints and roofing felts.
• For constructing roads and pavements etc.