ROAD TRAFFIC NOISE AS AN ENVIONMENTAL PROTECTION PROBLEM
Main researcher
: SRŠEN, MATE (44363) Assistants
SUŠIĆ, ŽELJKO (89852)
BOŠNJAK, JOSIP (57652)
Type of research: applied Duration from: 01/01/92. to 12/15/96. Papers on project (total): 4
Institution name: Institut građevinarstva Hrvatske, Zagreb (110) Department/Institute: Pavement Engieering Division-Tranportation Department Division for Physical Measurment-Building Department Address: HR - 10000 Zagreb, Janka Rakuše 1, P.O.Box 283, Croatia City: 10000 - Zagreb, Croatia
Communication
Phone: +385 (0) 1 6115243
Fax: +385 (0) 1 534737
Summary: The basic objective of the project is to study
acousticproperties of the road traffic noise for roads in zones, and
urban areas as classified according to the Law on Protection againstNoise.
The present-day technology in thevehicle-manufacturing sector has advanced
to such an extent thatthe dominant noise source is now limited to the
contact areabetween the tire and the road surface. In order to further
reduce the road-noisepropagation, it is essential to reduce noise at the
contactbetween the tire and the road surface. Experiencegained in this
field shows that pavement surfacing with highproportion of voids and
fine-grained particles is, from theacoustic standpoint, more favorable than
the traditionalasphalt-concrete surfacing.
The research concentrates on several main tasks, such as:
* Analysis of noise generated by the contact between tires and road
suface,
* Analysis and classification of the proportion of heavy vehicles in
the overall daily traffic on individual road typesin Croatia,
* Analysis of comparative studies on the noise generated by the
rolling of wheels on the road surface,
* Analysis of the protection against noise, including protective
measures.
It is expected that the above research will result in the morecomplete
fulfillment of requirements placed on engineeringproperties of the road
surface, particularly with respect to theprotection of environment against
unfavorable and harmful impactof the road-surface noise.
Research goals: The present research aimed at reducing the
road-traffic noise shows that,in addition to using various noise barriers,
thenoise can also effectively be reduced by intervening in itssource,
which is in this case the driving surface of the road. In order to reduce
noise generated by wheels rolling on thepavement surface, it is necessary
to develop "less noisy" special road surfacing types (for instance, the so
calleddrainage asphalt) that can reduce the wheel noise level by 3 to 5dB
(A) when compared to traditional types of asphalt surfacing.
Consequently, individual types of final pavement courses mustproperly be
quantified which can only be done by measuringacoustic properties of noise
produced by the contact between tires and such driving surfaces. Research
results will be reflected in recommendations, which willprove quite useful
in selecing appropriate types of road-pavementwearing courses (with
respect to granularity and mix composition)and as protective measures to
be taken considering the noiselevel set for individual road categories and
traffic structures.Research results will serve as a basis for defining or
improving technical regulations for the road noise standardization.
COOPERATION - INSTITUTIONS
Name of institution
: Prometis d.d. Type of institution: Economical/Production Type of cooperation: Occasional exchange of information City: 10000 - Zagreb, Croatia
Name of institution
: Brodarski institut Type of institution: State institute Type of cooperation: Occasional exchange of information City: 10000 - Zagreb, Croatia Other information about the project.