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为了研究微表处的噪声特性,以轮胎驱动式路面功能加速加载试验系统为基础试验平台,开发了微表处噪声测试系统,通过模拟车轮在微表处路面上行驶,研究微表处噪声产生机理。试验研究结果表明:对比沥青混凝土,微表处混合料初期噪声水平远大于沥青混凝土,而随着使用时间的增加这一差别逐渐缩小;级配较细的微表处混合料其噪声小于级配较粗糙的微表处混合料;轮胎作用次数是影响微表处噪声大小的一个客观因素,试验末期所测得噪声声压级比试验初期降低约0.4 dB(A);通过添加适量橡胶粉可以降低微表处刚度,显著降低微表处的噪声。本研究开发的噪声测试系统可以较好地测试微表处路面的行车噪声,从而为开发低噪声微表处技术提供了很好的试验检测平台。
In order to study the noise characteristics of the micro-surfacing site, a tire-driven pavement acceleration loading test system is taken as the basic test platform, a micro-surfacing noise test system is developed. By simulating the wheel running on the surface of the micro surfacing site, mechanism. The experimental results show that compared with asphalt concrete, the initial noise level of micro-surfacing mixture is much larger than that of asphalt concrete, and the difference gradually decreases with the increase of service time. The noise of micro-surfacing mix with smaller gradation is less than that of gradation Rough coarser micro-surfacing mixture; the number of tire actions is an objective factor that affects the noise level at the micro-surfacing site; the noise sound pressure level measured at the end of the experiment is about 0.4 dB (A) lower than that at the beginning of the test; Reduce the stiffness of micro-surfacing, significantly reduce the noise at the micro-surfacing. The noise test system developed in this study can test the driving noise of the road surface at the micro-surfacing well, which provides a good test and detection platform for the development of low-noise micro-surfacing technology.