Abstract
The wave velocity of acoustic emission (AE) can reflect the properties of materials, the types of AE sources and the propagation characteristics of AE in materials. At the same time, the wave velocity of AE is also an important parameter in source location calculation by the time-difference method. In this paper, a new AE wave velocity measurement method, the arbitrary wave (AW) method, is proposed and designed to measure the AE wave velocity of an asphalt mixture. This method is compared with the pencil lead break (PLB) method and the automatic sensor test (AST) method. Through comparison and analysis, as a new wave velocity measurement method of AE, the AW method shows the following advantages: A continuous AE signal with small attenuation, no crosstalk and a fixed waveform can be obtained by the AW method, which is more advantageous to distinguish the first arrival time of the acoustic wave and calculate the wave velocity of AE more accurately; the AE signal measured by the AW method has the characteristics of a high frequency and large amplitude, which is easy to distinguish from the noise signal with the characteristics of a low frequency and small amplitude; and the dispersion of the AE wave velocity measured by the AW method is smaller, which is more suitable for the measurement of the AE wave velocity of an asphalt mixture.
Highlights
As a multi-phase composite material, asphalt mixtures cause a series of problems under the action of the external environment and vehicle load
Comparing the wave velocity measured by the three acoustic emission (AE) wave velocity measurement methods (Figure 10a) and their standard deviation (Figure 10b), it can be seen that the initial wave velocity distribution of AE measured by the pencil lead break (PLB) method is 3000–3800 m/s and the standard deviation is close to 200, which indicates that the initial wave velocity of AE
A new method, the arbitrary wave (AW) method, was designed for measuring the AE wave velocity of asphalt mixtures, and the AE wave velocity of an asphalt mixture beam was measured by the AW method and traditional AE wave velocity test methods, respectively
Summary
As a multi-phase composite material, asphalt mixtures cause a series of problems under the action of the external environment and vehicle load. The evaluation of the pavement performance of asphalt mixtures is mainly based on laboratory mechanical tests. In terms of low-temperature cracking, AE technology was used to study the low-temperature fracture process zone and creep damage zone of asphalt mixtures [1,2]. AE technology has been proved to have advantages in characterizing the low-temperature fracture of recycled and modified asphalt mixtures [3,4]. Wei et al [9] studied the dynamic evolution process of low-temperature cracking of asphalt mixtures by using AE technology and the discrete element simulation method. AE technology was used to monitor the internal damage, crack type, fracture mode and other characteristics of a steel slag permeable asphalt mixture under compression and splitting [17,18,19,20]
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