The reverberation time of dense graded pavement, single layer drainage noise reduction pavement, and double layer drainage noise reduction pavement in Dahongling Tunnel 2 (long tunnel) was tested, and the reverberation time of different types of pavement conditions was 3.17s, 1.72s, and 1.55s, respectively. The typical attenuation curve calculated during the test is shown in Figure 3.1.
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