- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LI Jinfeng, HE Zhaoyi, KONG Lin. Evaluation of Acoustic Performance of Porous Asphalt Concrete[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 207-214. doi: 10.3969/j.issn.0258-2724.20210074
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The sound absorption performance of porous asphalt concrete has an important impact on reducing tire/pavement noise. The sound absorption coefficients of porous asphalt concrete (PAC), stone matrix asphalt (SMA-13) and a dense graded asphalt concrete (AC-13) are tested adopting the standing wave ratio method at one-third octave frequencies. The effects of several concrete properties are investigated; i.e., the grade distribution type, void content of the asphalt mixture, specimen thickness and surface texture. It is found that the sound absorption coefficients of PAC with a higher void content are much larger than those of SMA-13 and AC-13, and the sound absorption spectrum first increases and then decreases with the noise frequency increasing. The linear expressions of the sound absorption coefficient with the connected void content are proposed for asphalt mixture. A higher void content and larger maximum nominal particle size result in a larger peak and average value of the sound absorption coefficient (i.e., better noise reduction performance) for the PAC, with the peak value of the sound absorption spectrum gradually moving to a higher frequency. As the specimen thickness decreases, the average value of the sound absorption coefficient decreases for the PAC, and there is no obvious change in the peak value of the sound absorption coefficient whose corresponding frequency shifts to a high frequency gradually. For SMA-13 and AC-13 with similar void percentages, the peak and average value of the sound absorption coefficient of the former are slightly larger than those of the latter. For the same PAC specimen, the average value of the sound absorption coefficient measured using a rough-surface receiving incident sound wave is about 13.9% larger than that measured using a smooth-surface receiving sound wave, which indicates that the surface texture is an important factor affecting the sound absorption performance of the PAC. In summary, increases in the void content, maximum nominal particle size and thickness contribute to improving the sound absorption performance of the PAC. The two former factors are more beneficial to the absorption of high frequency noise, while the last factor is beneficial for the low frequency.
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