基于干法复配改性的降噪沥青混合料薄层设计

Design of Noise Reducing Asphalt Mixture Thin Layer based on Dry Mixing Modification

通过干法添加二元降噪弹性粒子对沥青进行复配改性,基于CAVF体积法设计沥青混合料,配制出一种用于加铺或改建的降噪薄层沥青混合料。通过干法复配改性增加混合料沥青含量,采用间断级配骨架密实型结构,增强混合料的骨架支撑和嵌挤作用。室内试验和现场应用表明:采用二元复配弹性降噪粒子改性沥青干法拌和可以同时提高混合料性能,包括高温性能、低温性能、抗水损坏性能,试验段实测噪音较原路面降低10~12 dB。

The asphalt is modified by dry mixing with binary noise-reducing elastic particles.Based on the CAVF volumetric method,an asphalt mixture for overlay or reconstruction is designed,and a noise-reducing thin-layer asphalt mixture is prepared.The dry mixing modification increases the asphalt content of the mixture,and the discontinuous grading skeleton dense structure is adopted to enhance the skeleton support and embedding of the mixture.Laboratory tests and field applications have shown that the use of binary compound elastic noise-reducing particles to modify asphalt dry mixing can improve the performance of the mixture at the same time,including high temperature performance,low temperature performance,and water damage resistance.The measured noise in the test section is 10~12 dB lower than the original road surface.