露石水泥混凝土路面降噪特性

为了分析露石水泥混凝土路面的降噪特性，采用轮胎落下法，通过调整不同的粒径、不同的级配，成型不同构造深度、不同表面特性的水泥混凝土路面板试件，对其进行室内路面噪声试验，分析路面表面纹理与路面噪声的关系。研究结果表明，路面构造深度与路面噪声有二次相关关系，表面露石纹理使频率在1．25kHz以上的噪声有较大幅度的降低，且有频率越高噪声降低幅度越大的趋势，频率在1．6kHz时，光面混凝土路面板噪声水平为87dB(A)，而露石水泥混凝土路面板噪声为80dB(A)，降低7dB(A)。可见合理的露石水泥混凝土路面可明显降低路面噪声，是一种很有发展前途的环保路面。

Noise reduction performance of exposed-aggregate cement concrete pavement

In the indoor pavement noise test, the paper used tyre-dropping method, adjusted different particle diameters and different gradations to obtain the cement concrete slabs of different texture depthes and surface characteristics, analyzed the correlation between the pavement texture and the pavement noise on the cement concrete slabs of different surface characteristics. Analysis results indicate that there is quadratic regression correlation between the pavement texture depth and the pavement noise, the texture of exposed-aggregate cement concrete pavement (EACCP) makes the sound level of above 1.25 kHz frequency be reduced apparently, and it has the tendency that the higher the noise frequency is, the larger its decrease degree is, when its frequency is 1.6 kHz, the pavement noise level of smooth cement concrete slabs is 87 dB(A), but the pavement noise of exposed-aggregate cement concrete slabs is (80 dB(A),) it is reduced by (7 dB(A).) So proper EACCP can reduce pavement noise greatly, is a prosperous pavement in environmental protection. 2 tabs, 3 figs, 5 refs.