Bitumen
Bitumen is a mixture of organic liquids that are highly viscous, black, sticky,
entirely soluble in carbon disulfide, and composed primarily of highly condensed
polycyclic aromatic hydrocarbons. Naturally occurring or crude bitumen is a sticky,
tar-like form of petroleum which is so thick and heavy that it must be heated or
diluted before it will flow. At room temperature, it is much like cold molasses.
Refined bitumen is the residual (bottom) fraction obtained by fractional distillation
of crude oil. It is the heaviest fraction and the one with the highest boiling point,
boiling at 525 °C (977 °F). In British English, the word 'asphalt' refers to a mixture
of mineral aggregate and bitumen (or tarmac in common parlance). The word 'tar'
refers to the black viscous material obtained from the destructive distillation
of coal and is chemically distinct from bitumen. In American English, bitumen is
referred to as 'asphalt' or 'asphalt cement' in engineering jargon. In Australian
English, bitumen is sometimes used as the generic term for road surfaces. In Canadian
English, the word bitumen is used to refer to the vast Canadian deposits of extremely
heavy crude oil, while asphalt is used for the oil refinery product used to pave
roads and manufacture roof shingles. Diluted bitumen (diluted with naphtha to make
it flow in pipelines) is known as dilbit in the Canadian petroleum industry, while
bitumen upgraded to synthetic crude oil is known as syncrude and syncrude blended
with bitumen as synbit. Most bitumens contain sulfur and several heavy metals such
as nickel, vanadium, lead, chromium, mercury and also arsenic, selenium, and other
toxic elements. Bitumens can provide good preservation of plants and animal fossils.
Bitumen is primarily used for paving roads. Its other uses are for bituminous waterproofing
products, including the use of bitumen in the production of roofing felt and for
sealing flat roofs. As this is heavy material your structure must be designed to
support weight even vibration and roofs must support this weight on the beams and
walls.
Bitumen can now be made from non-petroleum based renewable resources such as sugar,
molasses and rice, corn and potato starches. Bitumen can also be made from waste
material by fractional distillation of used motor oils, which is sometimes disposed
by burning or dumping into land fills. Non-petroleum based bitumen binders can be
made light-colored. Roads made with lighter-colored pitch absorb less heat from
solar radiation, and become less hot than darker surfaces, reducing their contribution
to the urban heat island effect.
Polymer modified binders (PMBs) are generally considered to provide prolonged life
or enhanced pavement performance. In sprayed seal and interlayer (membrane) applications,
polymers can greatly prolong pavement life by inhibiting reflective cracking. In
dense-graded asphalt applications, PMBs are effective in reducing rutting and improving
fatigue crack resistance. The higher shear resistance provided by PMBs can give
beneficial effects in roundabouts, tight corners and other high stress areas. Polymers
have also demonstrated the ability to prolong the life of open-graded surfacings
by allowing thicker binder films, which are less prone to oxidation and tougher
films that resist collection of foreign matter and dust, thus maintaining the desirable
water drainage capacity of these mixes. The role of a PMB varies in each different
application. Also, the different PMBs work in different ways. It is therefore very
important to choose the correct binder for each application and it is equally important
to design the mix or seal correctly.
Xiamen China-Nice Manufacturing and Trading Co., Ltd. [China] Street Address
: Room 1002, No. 225, Xinjing Haiyun Garden, Huizhannanli Road, Xiamen City, Fujian
Province, China
(Self-adhesive) APP/SBS Modified Bitumen/Asphalt Water-proof Membrane/Underlay (Self-adhesive)
APP/SBS Modified Bitumen/Asphalt Water-proof Membrane/Underlay is widely used in
basement, toilet, pond, civil and industrial roof, car park, bridge, swimming pool,
tunnel and refurbishment of bitumen roof, etc. It is specially suited to use in
the cold area and buildings with frequent structural movements. Features: 1) Conforms
to the national standards 2) Featuring no pollution and long service life 3) Strong
impermeability 4) High tensile strength, elongation, ability to adapt the grassroots
shrinkage deformation and cracking 5) Corrosion resistance, resistance to mildew,
weathering good performance 6) Construction convenient, hot-melt can be operated
Four Seasons Construction, reliable joints 7) SBS modified bitumen waterproof membrane
is specially used as waterproof material in cold area 8) APP is specially suitable
for areas of high temperature and of strong sun-shine Specifications: 1) Grade:
Grade I or Grade II 2) Base: Polyester or Fiberglass 3) Top surface: PE film, sands,
mineral slates, Aluminum foil 4) Thickness: 2mm, 3mm, 4mm 5) Width: 1 m 6) Length:
10m or 7.5m
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