Noise reducing bridge expansion joints in the Netherlands - Analysis of 10 years of measurement experience
* Presenting author
The Netherlands have applied silent road surfaces successfully for more than 30 years now. Due to this general noise reduction, local noise sources, like the noise of bride expansion joints, are no longer masked and pop up as a new challenge. Since 15 years several silent expansion joints have been used. In 2006, the first Dutch measurement assessment protocol came into effect which enables to measure the sound of (silent) expansion joints in a uniform manner. Since 2013, a noise label for expansion joints has been installed.For this paper, sound measurements have been analyzed of more than 200 expansion joints according to this standard measurement protocol. In addition to sound, several build quality parameters have been registered, like the height and quality of installation, the angle to the road and the number of beams. The research provides insight into the differences between types of joint, as well as the dispersion within a type. In addition, a relationship is established between the the noise level and several design and build quality parameters. The paper also provides insight into the ongoing research, using 3D laser texture measurements.