微表处混合料室内噪声测试方法

微表处混合料以其防水、抗滑、耐磨等优点已经广泛用于路面的养护维修。但是，与普通沥青路面相比，微表处路面噪声较大、且缺乏有效的噪声测试方法。为此，提出了基于湿轮磨耗仪的微表处混合料室内噪声测试方法。其中，微表处混合料试件用以模拟微表处路面，湿轮磨耗仪用以模拟车辆荷载，噪声计用以获取轮胎与路面的噪声。进而，对9种不同级配的微表处混合料的噪声进行了测试，结果表明：第二时段的噪声值与构造深度的相关性较好，并最终确定了微表处混合料的噪声测试方法和流程。最后，采用两种不同级配的微表处混合料对该测试方法进行了验证，结果表明，该方法能够有效评价不同微表处混合料噪声之间的区别，为微表处混合料的配合比设计提供有益补充。

Test Method of Indoor Noise for Micro-surfacing Mix

Micro-surfacing mix has been wildly used in the pavement maintenance for its water proofing, anti-skidding and wear resistance. However, micro-surfacing pavement has higher noise than the common asphalt pavement and its noise can not be measured effectively and accurately. Therefore, the indoor noise test method of micro-surfacing mix based on wet track abrasion test was explored. The micro-surfacing mix specimens were used to imitate the micro-surfacing pavement. The wet track abrasion tester was used to provide the vehicle loads. The sound level meter was used to measure the noise between tire and pavement. Furthermore, the indoor noise of nine kinds of micro-surfacing mixes with different gradation was examined. The results show that the equivalent sound level in the second time period has good relationship with the surface texture depth by sad patch method. Then the test method and test procedure for the indoor noise of micro-surfacing mix based on wet track abrasion test were given. Finally, two micro-surfacing mixtures with different gradations were made to validate the test method. The results show that the evaluation method can effectively distinguish the difference of micro-surfacing mixes with different gradation and can supplement the mix design method of micro-surfacing mixes.