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ASPHALT
ASPHALT Prepared by: Diar I. Mohammed
Supervised by: Mr. Kanaan
11/4/20151
1
Introduction ....Page 3Chemical Structure of Asphalt. Page 5Origin of Asphalt .. ....Page 6How is Asphalt produced ........Page 7Basic Refining Process...Page 8
Uses of AsphaltPage 9Types of Asphalt Page 10Emulsion Asphalt...Page 11Engineering properties of Asphalt...Page 12Questions.Page 13 Contents 11/4/20152
Introductionused for construction and maintaining all kinds of roads, parking areas and spot areas. aggregates for asphalt mixture could be crushed rock, sand and slags .Asphalt known as bitumen, is a sticky, black and highly viscous liquid or semi solid petroleum.Asphalt is a mixture of aggregates.
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Normal pavements:11/4/20154
Chemical Structure of AsphaltOil 35 to 50%Resins 5 to 20%
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Asphaltenes 20 to 30%Acids others. Up to 10%
Origin of Asphalt Asphalt materials have been utilized since 3500 B.C. IN building and road construction.
Demand for paving roads in late 1800 lead to use of petroleum asphalts .
These early asphalts were native asphalt .which were found in pools and asphalt lake .11/4/20156
How is Asphalt ProducedAsphalt is simply the residue left over from petroleum refining .1-Crude oil is heated in a large furnace to about 340 C partially vaporized .2-it is then fed into distillation tower where the lighter
components vaporize and drawn off For future processing
3-The residue from this process (Asphalt) is usually fed into a vacuum distillation unit where heavier gas oils are drawn off. 11/4/20157
Basic Refining Process
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Uses of Asphalt Although asphalt is mainly used for paving roads.used for various other purpose .the versatility of asphalt makes it such a widely used material .it can be found in the following sectors :
Transportation RecreationAgriculture Industrial Building construction
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11/4/201510Asphalt recycling
Types of AsphaltPorous Asphalt Mastic Asphalt Soft Asphalt Asphalt ConcreteStone Mastic Asphalt Rolled Asphalt ConcreteAsphalt Emulsion Hot Mix Warm Mix Cold Mix 11/4/201511
11/4/201512Emulsion Asphalt Combination of three basics ingredients: 50-70 % asphalt , 30-50 % water and 1% of an emulsifying agent.
Uses road Construction Maintenance
Engineering Propertiesof asphalt Penetration Value Softening Point Flash And Fire Point DuctilityViscosityBitumen Content in a Max
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Questions11/4/201514?
Thank you11/4/201515