The Properties of Noise Absorbing Blocks and Their Applications for Railway

초록

The construction of concrete track system is increased recently because concrete track can reduce maintenance work compared with ballast track. But the noise level on concrete slab track is about 3dB(A) higher than the one on ballast track is using noise absorbing blocks. It has been made clear that noise absorbing blocks are effective for reducing the rolling noise on concrete tracks. They are products of porous lightweight concrete mixed with volcanic aggregate. The Measurement and analysis work of outdoor noise along the railway before and after the installation of noise absorbing blocks were carried out to verify their noise reducing effect. The noise level decreased approximately more than 3dB(A) at 3.3m away from track center. In this study, the properties and performance of noise absoubing blocks are investigated based on test results.