Asphalt pavement sound absorption coefficient pre-estimating method based on gap shape parameter test

Abstract

The invention discloses an asphalt pavement sound absorption coefficient pre-estimating method based on a gap shape parameter test, which can obtain a sound absorption coefficient of a multi-gap asphalt pavement in a full-frequency range, overcomes the disadvantages of the existing sound absorption coefficient testing method, and can be used for a de-noising optimization design for a gap structure of the multi-gap asphalt pavement while no sound absorption coefficient testing equipment is used. The method comprises the following steps of: step 1, rotating a molded asphalt mixed material test piece and testing the porosity of the test piece; step 2, cutting the asphalt mixed material test piece into a plurality of cylinders; shooting to obtain a cross section pattern of each cylinder and determining a gap length d; utilizing an image processing method to obtain a gap average equivalent radius R in the test piece; and step 3, substituting three tested gap shape parameters into a formula to obtain a sound absorption coefficient alpha of an asphalt mixed material in the full-frequency range.

Description

technical field [0001] The invention relates to a method for estimating the sound absorption coefficient of asphalt pavement based on the test of asphalt pavement void form parameters, and belongs to the technical field of highway asphalt pavement. Background technique [0002] With the gradual improvement of people's living standards and increasing attention to environmental issues, the problem of traffic noise has become increasingly prominent. Traffic noise pollution has become an important source of pollution after water pollution and air pollution. It not only affects the production and life of residents along the road, but more importantly, it will gradually infringe on the health of residents along the road. In mild cases, hearing loss and severe cases lead to hearing loss Or induce serious cardiovascular disease. [0003] In order to improve the environmental quality of residents along the road and reduce the harm caused by traffic noise, three technical measures ha...

AI Technical Summary

Problems solved by technology

The following problems are solved: the existing multi-void asphalt pavement sound absorption coefficient test methods mostly use standing wave tubes, and due to the limitations of the standing wave tube diameter and the particle size of asphalt mixture aggregates, the sound absorption coefficient in the full frequency range cannot be measured; Although the mobile sound absorption coefficient test equipment can test the sound absorption coefficient of on-site asphalt pavement, it can only measure the sound absorption coefficient within a certain frequency range (below 1600Hz)

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