环境与车辙影响下OGFC空隙率与吸声系数相关性
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吴建涛(1981—),男,副教授,博士,硕士生导师,研究方向为沥青材料力学及路用性能。

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U416.217

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国家自然科学基金资助项目(51108157);中央高校基本科研业务费专项资金项目(2015B17214)


Correlation Between OGFC’s Void and Sound Absorption Coefficient Under the Influence of Environment and Rut
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    摘要:

    取配合比相同的 OGFC 车辙板,利用自主开发的“老化+水损害”环境模拟装置对车辙板分别进行单一热氧老化作用、单一水损害作用、老化-水分共同作用的环境处理,并进行车辙试验,试验后于车辙板胶轮碾压处取直径为 50 mm 的圆柱体芯样。 测试并计算各芯样空隙率及连通空隙率,后采用传递声函数法对所有芯样进行吸声系数测试。 在此基础上分析试件空隙率、连通空隙率与吸声系数均值、吸声系数峰值的关系。 结果表明,试件空隙率、连通空隙率与吸声系数峰值之间相关性更高, 其中连通空隙率与吸声系数峰值的相关性优于空隙率。 对比之前的研究得到,本实验对车辙板所做的环境处理及车辙试验对试件空隙率、连通空隙率与吸声系数峰值的相关性无明显影响,用吸声系数峰值表征环境及车辆荷载作用后的 OGFC 混合料的连通空隙率是更加有效的。

    Abstract:

    OGFC slabs with the same mixture design were treated by SHRP aging, water damage, and self-de- veloped aging+water damage coupling environment simulator. Then, rutting tests were applied to the environment treated specimens, and cylindrical specimens with a diameter of 50 mm were cored from the tracking sites of rutting wheel. The void and sound absorption properties of these cylindrical specimens were tested and their re- lationships were analyzed. The results showed that the peak acoustic absorption coefficient correlates better than average acoustic absorption coefficient to the void content and the connected void content. In addition, by com- paring with previous studies, it is concluded that the environmental treatment conditions in this study have no significant impacts on the voids, connected voids and the peak acoustic absorption coefficient of the specimen. It is more effective to use the peak acoustic absorption coefficient to represent the connected voids of OGFC mix- ture under the action of environment and vehicle load.

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吴建涛,马鑫源,王浩安,吴俊扬,王志新.环境与车辙影响下OGFC空隙率与吸声系数相关性[J].华东交通大学学报,2019,36(4):17-23.

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  • 在线发布日期: 2021-05-31
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