Key Technology of Asphalt Concrete Detection Under Different Aging Degree
In the service process of asphalt concrete pavement,due to the different environment,pavement load and service time,there are different degrees of aging.Asphalt concrete aging is one of the main causes of pavement diseases.Accurate evaluation of the aging degree of asphalt concrete can provide a basis for pavement structure repair.Through the aging test and ultrasonic acoustic detection of asphalt concrete,the received acoustic signal is processed and analyzed,and the acoustic characteristic parameters that can reflect the aging degree are extracted,which is beneficial to determine the aging degree of asphalt concrete.The research results show that under different aging time,the first wave waveform of ultrasonic testing of the same asphalt concrete specimen is roughly the same,the coda wave waveform has a certain degree of distortion,the first wave arrival time does not change significantly,and the coda wave arrival time changes significantly.The frequency domain signals of different asphalt concrete specimens are mainly distributed in the frequency range of 25～125 kHz,and the main peak frequency in the frequency domain is near 75kHz.With the increase of aging time,the penetration of asphalt decreases gradually.The aging degree of asphalt concrete specimens increases with the increase of aging time.The growth trend of aging degree of asphalt concrete specimens is the same as that of the change rate of the coda wave velocity,and the change rate of the coda wave velocity can better reflect the aging degree.
万方数据
维普
