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    What Is Asphalt

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    Diomar Labro
    Asphalt is a dark-brown or black mixture of aggregates and binder used to construct roads and other surfaces. It is one of the oldest engineering materials, dating back to ancient Egypt. Asphalt is produced by heating aggregates and binder and is used at different temperatures - hot, warm, or cold - for various applications like roads, parking lots, and playgrounds. It is laid down in layers with different compositions to distribute loads effectively. Asphalt offers advantages over concrete like lower cost and faster construction, though concrete is more durable.

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    What Is Asphalt

    Uploaded by

    Diomar Labro
    38 views22 pages
    Asphalt is a dark-brown or black mixture of aggregates and binder used to construct roads and other surfaces. It is one of the oldest engineering materials, dating back to ancient Egypt. Asphalt is produced by heating aggregates and binder and is used at different temperatures - hot, warm, or cold - for various applications like roads, parking lots, and playgrounds. It is laid down in layers with different compositions to distribute loads effectively. Asphalt offers advantages over concrete like lower cost and faster construction, though concrete is more durable.

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    What is Asphalt

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    Asphalt is a dark-brown or black mixture of aggregates and binder used to construct roads and other surfaces. It is one of the oldest engineering materials, dating back to ancient Egypt. Asphalt is produced by heating aggregates and binder and is used at different temperatures - hot, warm, or cold - for various applications like roads, parking lots, and playgrounds. It is laid down in layers with different compositions to distribute loads effectively. Asphalt offers advantages over concrete like lower cost and faster construction, though concrete is more durable.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    38 views22 pages

    What Is Asphalt

    Uploaded by

    Diomar Labro
    Asphalt is a dark-brown or black mixture of aggregates and binder used to construct roads and other surfaces. It is one of the oldest engineering materials, dating back to ancient Egypt. Asphalt is produced by heating aggregates and binder and is used at different temperatures - hot, warm, or cold - for various applications like roads, parking lots, and playgrounds. It is laid down in layers with different compositions to distribute loads effectively. Asphalt offers advantages over concrete like lower cost and faster construction, though concrete is more durable.

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    ASPHALT

    WHAT IS ASPHALT?
    Asphalt is a mixture of aggregates, binder and filler, used for
    constructing and maintaining all kind of roads, parking areas and
    also for play and sport areas.
    WHAT IS ASPHALT?

    ◈ Asphalt is a bitumen-class hydrocarbon mixture, typically having


    a dark-brown to black color.
    ◈ Asphalt is one of the oldest engineering materials known to man,
    dating as far back as 2600 B.C. when the ancient Egyptians
    used it as a waterproofing agent and preservative for the
    wrappings of mummies.
    ASPHALT MANUFACTURING
    PROCESS
    DIFFERENT KINDS OF ASPHALT

    ◈ Needs sufficient stiffness and resistance to deformation


    ◈ Needs adequate flexural strength
    ◈ Good workability during application
    KINDS OF ASPHALT

    ◈ Hot Mix Asphalt (HMA)


    Hot asphalt mixes are generally produced at a temperature
    between 150 and 180 °C.
    Depending on the usage, a different asphalt mixture can be
    used.
    KINDS OF ASPHALT

    ◈ Warm Mix Asphalt (WMA)


    Warm Mix Asphalt is an asphalt that is produced and applied at a
    temperature around 20 - 40 °C lower than an equivalent “Hot Mix
    Asphalt” (HMA).
    Due to the lower production temperature compared to an equivalent
    Hot Mix Asphalt (HMA), less energy is needed for the production. It
    is also paved at a lower temperature than HMA resulting in lower
    emissions, lower exposure and improved working conditions for the
    crew.
    KINDS OF ASPHALT
    ◈ Cold Mix Asphalt
    Cold mixes are produced without heating the aggregate. This is only
    possible, due to the use of a specific bitumen emulsion which breaks
    either during compaction or during mixing. After breaking, the
    emulsion coats the aggregate and over time, increases its strengths.
    Cold mixes are particularly recommendable for lightly trafficked
    roads.
    ASPHALT LAYERS

    Surface course
    ◈ constitutes the top layer of the pavement
    ◈ Able to withstand high traffic and environmentally-
    induced stresses without exhibiting unsatisfactory
    cracking and rutting
    ◈ Possess a texture ensuring adequate skid resistance
    ASPHALT LAYERS
    Surface course
    ASPHALT LAYERS

    Binder Course
    ◈ Binder courses are designed to withstand the highest
    shear stresses that occur about 50 – 70 mm below the
    asphalt surface
    ◈ placed between the surface course and base course
    ASPHALT LAYERS

    Base course
    ◈ most important structural layer of the pavement
    ◈ intended to effectively distribute traffic and environmental
    loading in such a way that underlying unbound layers are not
    exposed to excessive stresses and strains
    ◈ implies comparatively high stiffness of the base course
    ASPHALT LAYERS

    Unbound materials and foundation


    ◈ Since the formation and sub-soil often constitute
    relatively weak materials, it is of utmost importance that
    the damaging loadings are effectively eliminated by the
    layers above
    ASPHALT MIXTURES

    1. Asphaltic Concrete (AC)


    2. Asphalt Concrete for very thin layers (AC-TL)
    3. Soft Asphalt (SA)
    4. Hot Rolled Asphalt (HRA)
    5. Stone Mastic Asphalt (SMA)
    6. Mastic Asphalt (MA)
    7. Porous Asphalt (PA)
    8. Double layered Porous Asphalt (2L-PA)
    9. Asphalt for Ultra-Thin Layers (AUTL)
    ASPHALT MIXTURES
    Difference between mixtures
    QUALITY CONTROL
    a. Consistency
    ◈ A standardized penetration test is generally specified when determining
    paving asphalt consistency. 

    b. Purity
    ◈ Refined asphalts are typically more than 99.5 percent soluble in carbon
    disulfide, with the remaining impurities being inert. 

    c. Safety
    ◈ The moisture may cause asphalt to foam when heated above 212°
    Fahrenheit, creating a safety hazard.
    ADVANTAGES OF ASPHALT
    ◈ Smooth & Comfortable
    ◈ Cost-efficient
    ◈ Safe
    ◈ Durable & can be constructed to last indefinitely
    ◈ Fast to construct and to maintain
    ◈ Up to 100% reusable
    ◈ Flexible
    ◈ Reducing noise reduction
    DISADVANTAGES OF ASPHALT

    ◈ Care and Sealing


    ◈ Cracks
    ◈ Environmental
    Issues
    ◈ Equipment
    ASPHALT VS CONCRETE
    Asphalt’s greatest advantage over concrete – cost
    ◈ Compared to concrete asphalt costs less
    ◈ You can put asphalt on an existing concrete driveway
    ◈ 100% Recyclable

    Concrete’s greatest advantage – longevity


    ◈ Properly installed concrete – 30 years
    ASPHALT VS CONCRETE
    Curing Time
    ◈ Curing time for asphalt is only a day or two
    ◈ Concrete driveways curing – 1 to 3 weeks to cure

    Design
    ◈ Concrete – have an artistic advantage

    Climate
    ◈ Warm temperatures – not good for asphalt
    ◈ Cold temperatures – not good for concrete
    ASPHALT VS CONCRETE

    Flexibility
    ◈ Asphalt offers enough flexibility to accommodate imperfections
    ASPHALT APPLICATIONS

    ◈ Transportation
    roads, bridge decks, railway beds or airport runways
    ◈ Recreation
    Playgrounds, bicycle paths, running tracks
    ◈ Agriculture
    Barn floors, greenhouse floors
    ◈ Industrial
    Ports, landfill caps, work sites

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