Bituminious Materials
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• Asphalt refining •Uses and properties
•Asphalt cement and physical tests •Asphalt cement grading system
•Rheological properties and pavement performance
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The term bituminous materials is generally used to denote substances in which bitumen is present or from which it can be derived [Goetz and Wood, 1960].
Bituminous mixtures are generally used to denote the combinations of bituminous materials (as binders), aggregates and additives
Asphalt and bitumen : petroleum products Tar : dark colored product obtained from
destructive distillation of organic substance like coal, wood and bituminous shale’s.
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Bitumen: A heavy fraction from oil distillation (also occurs as part of natural asphalt).
Tar: A viscous liquid obtained from distillation of coal or wood. Rarely used in construction currently in the UK.
Asphalt: A mixture of bitumen and mineral filler. Note that Hot Rolled Asphalt is a road surfacing material.
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Defined as a mixture of bitumen with a substantial proportion of inert mineral matter.
Bitumen is used as a binding material in asphalt Asphalt is used primarily for road construction
and roofing materials due to its remarkable waterproofing and binding properties. The hard surfaces of roads, for example, depend on the ability of asphalt to cement together aggregates of stone and sand.
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Natural Sources
Lake asphalts (Bermudez and Trinidad)
Gilsonite - occur in faults, large deposit in Utah, very hard substance, used in varnish/paper/powered form on roads
Rock asphalts - sandstone or limestone impregnated with asphalt (0 to 20% asphalt), usually too expensive for use in paving, found in KY, OK, AR, AL, TX, UT, CA
Petroleum Asphalts
Asphalt is obtained from crude oil by a process called FRACTIONAL DISTILLATION
Crude oil is a mixture of different hydrocarbons which are mutually soluble - fractional distillation is used to separate the fractions based on boiling point
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Asphalt binder is simply the residue left over from petroleum refining
The composition of base crude oil from which asphalt is refined can vary widely and thus the asphalt yield from different crude oil sources can also vary widely
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Crude oil is heated in a large furnace to about 340° C and partially vaporized.
It is then fed into a distillation tower where the lighter components vaporize and are drawn off for further processing.
The residue from this process (the asphalt) is usually fed into a vacuum distillation unit where heavier gas oils are drawn off.
Asphalt cement grade is controlled by the amount of heavy gas oil remaining.
Depending upon the exact process and the crude oil source, different asphalt cements of different properties can be produced.
Additional desirable properties can be obtained by blending crude oils before distillation or asphalt cements after distillation.
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Bitumen or asphalt or their blend with flux oils having adhesive qualities for making mastic asphalt
Mastic asphalt : prepared by mixing the required mineral filler (eg. limestone, dust, sand or grit and coarse aggregate) with black bitumen heated to a liquid form. On cooling, it consolidates to a hard elastic block
Tough, durable, non-absorbent, damp proff, non-inflammable and noiseless
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Types: Asphalt cement
Asphalt cutback
Asphalt emulsion Asphalt cement is an asphalt which has been
specially refined as to quality and consistency for direct use in the construction of asphalt pavements. An asphalt cement has to be heated to an appropriate high temperature in order to be fluid enough to be mixed and placed
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Cutback asphalt is a liquid asphalt which is a blend of asphalt and petroleum solvents (such as gasoline and kerosine). A cutback asphalt can be mixed and placed with little or no application of heat. After a cutback asphalt is applied and exposed to the atmosphere, the solvent will gradually evaporate, leaving the asphalt cement to perform its function as a binder.
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Emulsified asphalt (or asphalt emulsion) is an emulsion of asphalt cement and water that contains a small amount of emulsifying agent. In a normal emulsified asphalt, the asphalt cement is in the form of minute globules in suspension in water. An emulsified asphalt can be mixed and applied without any application of heat. After an asphalt emulsion is applied, sufficient time is required for the emulsion to break and the water to evaporate to leave the asphalt cement to perform its function as a binder. In an inverted emulsified asphalt, minute globules of water are in suspension in a liquid asphalt, which is usually a cutback asphalt. Inverted asphalt emulsions are seldom used in pavement applications.
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Asphalt cement : hot-mix asphalt concrete for the surface layer of asphalt pavements
Asphalt concrete : patching and repairing asphalt and PC pavements
Liquid asphalts : pavement maintenance applications – fog seals, chip seals, slurry seals and microsurfacing
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Asphalt pavement
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Microsurfacing for preventive maintenance measure
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Roof coverings, flashing, water-proofing of roofs
Damp proof courses Flooring material Tanking of basement floors (building water
barriers in basement)
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Consistency of asphalt is greatly affected by temperature
Low temperature : Hard & brittle High temperature : Soft Grade of asphalt cement should be selected
according to climate Soft grade : cold climates Hard grade : hot climates
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Robertson et al. (1991) describe asphalt behavior in terms of its failure mechanisms
Aging
Rutting
Fatigue cracking
Thermal cracking
Stripping
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Bitumen is a black, oily, viscous material that is a naturally-occurring organic byproduct of decomposed organic materials
Becomes soft at moderate temperatures Extensively used for surfacing of road and
airport pavement
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Straight run bitumen : bitumen distilled to a definite viscosity of penetration
which does not require further treatment like heating Blown bitumen : can be modified by heating until it becomes a liquid and
then passing air under pressure by which all the volatile compounds in it can be driven out.
Blow bitumen has a high softening point that if exposed directly to the sunrays for any length of time, it does not get soft.
Very hard in ordinary room temperature. Soluble in some solvents Commonly used for manufacturing joint fillers
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Penetration grade
Basic form of bitumen and has to be heated before application
Cutback bitumen
Bitumen combined with other petroleum distillates
Bitumen emulsion
Product in liquid form formed in aqueos medium and stabilizing agents
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Plastic bitumen Consists of bitumen thinner and suitable filler made
into a plastic form
Can be used for filling crack in masonry, stopping leakages etc.
Cutbacks Bituminous materials in solvents
Residual bitumen Solid substance at normal temperature and is
obtained as a residue during distillation of high-resin petroleum
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Obtained when bitumen is combined with plastics
Also known as polymerized bitumen In this process, bitumen is not heated to high
temperature in its manufacture Lighter oils are also preserved in modified
bitumen, thus improving its flexibility and resistance to weathering
Modified-polymer bitumen are used for preparation of waterproofing works
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Atactic Polypropylene (APP)
Plastomer
Generally stronger and stiffer
Sequenced Butadiene Styrene (SBS)
Elastomer
Greater flow for expansion and waterproofing qualities
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Bitumen is specified by the term ‘penetration’ Penetration grade bitumen is semi-solid ay
ambient temperature and required to be heated to make it fluid enough for applications such as waterproofing
Specification 80/100 – penetration of standard needle at temperature of 25oC of depth between 80-100mm.
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Tar is different from bitumen and there is different types of tar
Coal tar
Wood tar
Mineral tar
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Obtained by heating coal in closed iron vessels to form coke
As the residue of the distillation of coal to produce coke, coal tar is a thick black liquid the consistency of a thick pudding
Coke is the solid carbonaceous material derived from destructive distillation of low-ash, low-sulfur bituminous coal. Cokes from coal are grey, hard, and porous.
Mostly used for roads
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Obtained by distillation of pine wood and other resinous wood
Contains creosote oil – strong preservative property for wood and also repels termites if applied on wooden posts buried in the ground
Creosote is the portion of chemical products obtained by the distillation of a tar that remains heavier than water, notably useful for its anti-septic and preservative properties
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Obtained by distilling bituminous shale’s In addition to use as a preservative of wood,
also used as a water proofing paint in many situations due to very good adhesive power
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A graded stone mixture coated with tar is used for tar macadam and when the mixture is coated with bitumen, it is called bitumen macadam
Used for pavements and walkways Mastic asphalt : used in city roads for smooth
riding surface
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Property Asphalt Bitumen Tar
Existing state Solid or semi-solid Usually solid at normal temperatures
Solid as a viscous liquid
Colour Blackish brown Dark black Deep black
Effect on heating Burns with smoke and become plastic at 250oC
Becomes liquid on heating
Becomes less viscous on heating
Adhesive power Not much Good Very good
Carbon content Less More Most
Setting time Not much Not much More
Resistance to acid and water
Good Good Less
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Paint
Used for manufacture of bituminous paints and other surface treatment
Industrial blown or R grade is mainly used for this purpose
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Roofing
Roofing felts and shingles (covering of roof) are made of fibres or plastics impregnated with penetration-grade bitumen and coated with blown-grade bitumen
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Damp proofing
Prefabricated mats which are sprayed with blown bitumen are used for damp proofing
Also used as small ‘water retaining, bituminous walls’ at refuse disposal sites to prevent pollution from spreading
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Tanking of basements
Asphalt and bitumen are the usual choices for water proofing of basements known as tanking of basement
Tanking is a term that is used when asphalt is formed to completely seal a void or area to keep moisture/water out or as a tank to keep liquid in.
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Protection of structures
Used as a protecting coating (by impregnation) for concrete elements such as piles, slab etc.
Over this coating, organic binders of 10-15mm thickness are also applied to prevent bitumen from eroding of
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Pavements
Extensively used for the construction of roads, runways, taxiways, etc.
Preservation of stones
Some of the materials used for stonework preservation from attach by salts and other substance present in the ground or in the atmosphere
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One of the specifications for waterproofing in building work
‘The surface shall be painted uniformly with bitumen of approve quality such as “residual type”, “petroleum bitumen, penetration 80/100, hot cutback bitumen or equivalent after heating to the required temperature as per specification of the manufacturers shall be used.’
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Measure of the hardness of the bituminous materials
The depth in milimeters to which the standard tapered needle penetrates vertically under a load of 100g in 5 seconds at a temperature of 25oc
This test measures only the consistency of the bitumen binders and has no relation to its binder capacity
Specification 80/100 => penetration between 80 to 100mm
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Temperature at which the bitumen softens
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Assemble the apparatus with the rings, thermometer and ball guides in position.
Fill the beaker with boiled distilled water at a temperature 5.0 ± 0.5oC per minute.
With the help of a stirrer, stir the liquid and apply heat to the beaker at a temperature of 5.0 ± 0.5oC per minute.
Apply heat until the material softens and allow the ball to pass through the ring.
Record the temperature at which the ball touches the bottom, which is nothing but the softening point of that material.
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