Detection method for noise reduction performance of asphalt concrete by using ultrasonic testing apparatus
A technology for asphalt concrete and detection devices, which is applied in the direction of analyzing solids using sound waves/ultrasonic waves/infrasonic waves, which can solve the problems of large noise level interference and difficulty in accurately reflecting the sound absorption performance of road materials, and achieve strong operability and reliable evaluation Effect
Inactive Publication Date: 2013-10-09
WUHAN MUNICIPAL ENG DESIGN & RES INST
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[0006] The main defect of the method of on-site testing of road tire noise level is that the measured noise level is greatly interfered by the characteristics of other traffic vehicles, engines, and tires, and it is difficult to accurately reflect the sound absorption performance of road surface materials
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[0027] Below with rubber asphalt concrete noise-reducing performance evaluation as example, how to implement in detail the method of the present invention is introduced:
[0028] During the implementation, the known Marshall compaction method was used to form and prepare two sets of asphalt mixture Marshall test specimens, each with 6 pieces, one set of asphalt concrete type is AC-13 type SBS modified asphalt concrete (commonly used asphalt concrete), Another group of asphalt concrete type ARC-13 type rubber asphalt concrete (new asphalt concrete), the two types of concrete are prepared with aggregates and mineral powder of the same material.
[0029] Place the asphalt concrete together with the test mold at room temperature for 1 day, demould, number, measure the height of the asphalt concrete sample, take the average value, and measure the density of the test piece in water.
[0030] Place the asphalt concrete sample in a constant temperature test box with a set test tempera...
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The invention provides a detection method for the noise reduction performance of asphalt concrete by using an ultrasonic testing apparatus, which belongs to the field of evaluation methods for the noise reduction performance of a road pavement material. According to the method, a standard asphalt concrete test sample with known length of L and volume density of Rho is adopted; two ends of the test sample are connected with two transmitting ports of a nonmetal ultrasonic tester respectively through an ultrasonic transmitting transducer and an ultrasonic receiving transducer; the transmission time of measuring ultrasonic waves from transmitting transducer to receiving transducer is t, the transmission speed v of the ultrasonic waves in the test sample is calculated based on the known length L, and the dynamic modulus E of the asphalt concrete test sample is calculated based on the theoretical calculation formula of the dynamic modulus E which is capable of characterization of noise reduction performance of a tested material, wherein E is equal to Rho(1+mu)(1-2mu)v<2>/(1-mu); and noise reduction performance of a related road pavement asphalt concrete material is indirectly evaluated based on the calculated value of the dynamic modulus E. The method provided by the invention has the advantages of easiness, feasibility, reliable data and capacity of rapidly finishing comparison and evaluation of noise reduction performance of related pavement asphalt concrete materials.
Description
technical field [0001] The invention discloses a method for detecting the noise reduction performance of asphalt concrete by using an ultrasonic detection device, belonging to the field of evaluation methods for the noise reduction performance of road pavement materials. Background technique [0002] The noise reduction performance of pavement materials can be evaluated by measuring the sound absorption coefficient of materials indoors and measuring the tire noise level of road surfaces on site. [0003] The sound absorption coefficient of indoor measurement materials is often measured by the standing wave tube method. The measuring instrument is generally composed of a standing wave tube + sound source system (speaker, audio signal generator, amplifier) + detector. The measurement principle is: the standing wave tube is a metal (plastic) straight tube, one end of which can be used to install the test piece with a fixture, and the other end is connected to a speaker. The a...
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IPC IPC(8): G01N29/07
Inventor 张守城蒋乐黄又清周俊徐刚
Owner WUHAN MUNICIPAL ENG DESIGN & RES INST
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