Asphalt streets lose their strength very quicklyas the temperature rises. Many highways, for
example, lead through desert areas in the USA
and Australia.
Driving heavy trucks in such areas push the
soft asphalt ahead or aside. The result is that
the trucks have to drive slower because of the
uneven road, which can certainly lead to
logisticalproblems and motorists who have to
drive in truck asphalt trails do not feel this as
a rest and drive slower. In residential areas,
out-of-the-way asphalt tracks cause noise
pollution as cars literally jump over thesetracks. If buses or trucks pass through these
streets, you can hold your cupboards in the
living room.
Depending on the quality of the asphalt, it is
tacky even at slightly higher temperatures and
at very high temperatures these surfaces can
neither be entered nor driven on without causing
damage.
A UHPC®-Asphalt combination can be thought
of as an asphalt matrix filled with UHPC®Ultra
High Performance Concrete. Thus, a large
proportion of this lining is UHPC® concrete,
which does not stick and temperature resistant
is well over 200°C/392°F. This combination is
still very stable even in extreme temperatures
up to 90°C/194°F in desert areas. Problem heating asphalt roads and
adjacent houses
There is an interesting article from a company
that measured the heating of an asphalt road
andadjacent house walls in a residential area.
Then they have provided the black asphalt
pavement with a white topcoat. The road
temperatures and house wall temperatures
were measured again. The result of this
temperature measurement was much lower
than the first measurement without coating.
If the walls of houses also get a
light coat thesunshine reflection is even better. We see this
idea as a solution but not a lasting, economical
solution.
Solution heating of the asphalt surface
and adjoining houses
As for the heating of the road surface we work
with a UHPC® binder with a very high degree of
whiteness, which makes the road seem much
brighter than the standard asphalt surface. It is
used in tunnels or production halls to save energy
for lighting. Compared to the two-layer solution
standard asphalt and white coating
layer, everythingis in one system and the UHPC® Phalt system is much
more durable and more economical than the
two-layer model.
Solution concrete highway
Many kilometers of roads have already been laid
with fiber-reinforced UHPC® concrete in Europe. In
addition to the extremely high strength values, which
are far above that of standard concrete, they also
achieve extremely low abrasion and are absolutely
frost and salt-resistant. The thermal stability in both
the minus and in the plus range is a lot better
compared to standard concrete. During processing,
of course, the same machines can be used as in a
standard concrete processing. Such lining is used
today on airports, highways, harbor area etc.
Solution asphalt roads
About 15 years old asphalt roads or asphaltedareas are lined with a combination system made
of asphalt and UHPC® binder. This ideal
combination of an asphalt matrix that is cast
with UHPC® Binder achieves a significantly
higher load resistance even at ground
temperatures of up to +90°C / 194°F compared
to a standard asphalt. Abrasion resistance is
much higher than standard asphalt. Such
lining is used today on airports, highways,
harbor area etc.
www.hhbc-consulting.de
info@hhbc-consulting.de
