Preparation and analysis of influencing factors of polymerfly ashaggregate porous noise reduction barrier material(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年5期
- Page:
- 27-37
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Preparation and analysis of influencing factors of polymerfly ashaggregate porous noise reduction barrier material
- Author(s):
- WANG Jianhui; LI Peipei
- Shanxi Exvironmental Protection Institute of Transport （Co., Ltd）， Taiyuan 030032， Shanxi， China
- Keywords:
- road engineering; polymerfly ash aggregate porous noise reduction barrier material; theoretical calculation of acoustics; highway sound barrier; influencing factor
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the feasibility and sound absorption performance of the fly ash aggregate with a porous structure in the field of highway traffic noise control, fly ash aggregate as sound barrier lightweight and epoxy resin as adhesive were adopted to prepare. The polymerfly ash aggregate porous noise reduction barrier material. The optimum particle size range of ash ceramics the suitable frequency range of road traffic noise was derived by using the acoustic gradation theory. The impedance tube test system was used to verify the specimen. The optimum ratio of epoxy resin to pulverize coal ash ceramsite was studied by single factor experiment, inspected the specimen thickness, composite grading, behind the surface cutting, adding material, cavity, simulated rain sound barriers, and freezethaw cycles on the influence of the materials mechanical properties and sound absorption performance. The results show that the optimal theoretical size of ceramsite and the experimental results is consistent, and the acoustic and mechanical properties is optimal when the mixing ratio is 1∶5. By increasing the thickness of the specimen, the sound absorption performance of the material at medium and low frequency (below 1 000 Hz) can be improved obviously. In the range of 1 000~1 600 Hz, the sound absorption coefficient decreases as the thickness increases. Compared with the single gradation, the peak value of the first resonance sound absorption coefficient of the composite gradation moves towards the lowfrequency direction. The sound absorption coefficient of 500~1 000 Hz has a significant trend of decrease. Adding rubber powder can improve the sound absorption performance of medium and high frequency, but has little effect on the sound insulation. The absorption coefficient of medium and low frequency of the material can be obviously improved by increasing the cavity, but the effect is limited. Surface cutting can improve the high frequency sound absorption coefficient of specimen, the influence law is similar to that of material thickness reduction. The effects of simulated rain and freezethaw cycles on sound absorption and mechanical properties are not obvious. 7 tabs, 18 figs, 31 refs.
Last Update: 2020-10-12