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Further development of Twinlay porous asphalt surfaces
Author(s)
Masondo, Phumlani Thulani
Date Issued
2001
Type
Thesis
Publisher
Peninsula Technikon
Abstract
Road traffic noise (with tyre/road interaction being the predominating factor to the
generation of noise production especially at vehicle speed above 50 km/h) is
becoming an escalating problem that poses a threat to the environment. Ways and
means of eradicating or at least retarding this problem have led to the development
of Porous Asphalt surfaces which has excellent functionality. Porous asphalt has
been used mainly for reducing aquaplaning subsequently reducing splash and spray
thereby reducing accident rate during wet weather conditions, reducing road traffic
noise and improves wet weather skid resistance
Two layered construction so called "Twinlay" is a new development which was
initiated in the Netherland with an intention of optimizing reduction to road traffic
noise and also to solve the shortfalls (e.g. clogging) associated with the conventional
single layer of porous asphalt. Twinlay is made up of a bottom layer of porous
asphalt with a coarse single grained aggregate (11/16) and a thin top layer of fine
porous asphalt (4/8). Twinlay has many advantages as opposed to the previous
practises (single layer of porous asphalt) in South Africa, e.g the fine top layer acts as
a sieve preventing sand or dirt from clogging the coarse bottom layer, and also, the
fine surface texture of the top layer reduces tyre/road noise and many more.
More research into road/traffic noise reveals that the acoustic properties of a
conventional Twinlay porous asphalt surface can be further improved by introducing
a thick double layer system (e.g. Superfine Twinlay) with a superfine top singlegrained
aggregate mixture.
generation of noise production especially at vehicle speed above 50 km/h) is
becoming an escalating problem that poses a threat to the environment. Ways and
means of eradicating or at least retarding this problem have led to the development
of Porous Asphalt surfaces which has excellent functionality. Porous asphalt has
been used mainly for reducing aquaplaning subsequently reducing splash and spray
thereby reducing accident rate during wet weather conditions, reducing road traffic
noise and improves wet weather skid resistance
Two layered construction so called "Twinlay" is a new development which was
initiated in the Netherland with an intention of optimizing reduction to road traffic
noise and also to solve the shortfalls (e.g. clogging) associated with the conventional
single layer of porous asphalt. Twinlay is made up of a bottom layer of porous
asphalt with a coarse single grained aggregate (11/16) and a thin top layer of fine
porous asphalt (4/8). Twinlay has many advantages as opposed to the previous
practises (single layer of porous asphalt) in South Africa, e.g the fine top layer acts as
a sieve preventing sand or dirt from clogging the coarse bottom layer, and also, the
fine surface texture of the top layer reduces tyre/road noise and many more.
More research into road/traffic noise reveals that the acoustic properties of a
conventional Twinlay porous asphalt surface can be further improved by introducing
a thick double layer system (e.g. Superfine Twinlay) with a superfine top singlegrained
aggregate mixture.
Additional information
Thesis (MTech (Civil Engineering))--Peninsula Technikon, 2001
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