SVIBOR - Project code: 2-11-405


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


SVIBOR - Collecting Data on Projects in Croatia

Project code: 2-11-405


Main researcher: SRŠEN, MATE (44363)

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
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.

Keywords: road traffic noise, tire noise, pavement surface characteristics,pavement roughness, noise level (dB), drainage asphalt, noisereduction, environmental protection

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.


  1. Name of institution: Prometis d.d.
    Type of institution: Economical/Production
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

  2. Name of institution: Brodarski institut
    Type of institution: State institute
    Type of cooperation: Occasional exchange of information
    City: 10000 - Zagreb, Croatia

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Last update: 12/27/95