透水沥青混合料动态模量影响因素分析

doi:10.11896/cldb.21010221

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Abstract The triaxial compression test of dynamic modulus of porous asphalt (PA) was carried out by using simple performance tester (SPT) to study the influence of air voids, confining pressure, loading frequency and temperature on dynamic modulus and phase angle in order to provide the basis for the structural analysis, design and maintenance of porous asphalt pavement, so as to promote its engineering application. Meanwhile, the grey correlation analysis was performed concurrently. The results show that the air voids has the greatest influence on the dynamic modulus and phase angle, while the confining pressure has relatively slight influence on them, and that the loading frequency and temperature mainly affect the dynamic modulus and phase angle respectively. The dynamic modulus of porous asphalt has obvious thermal and rheological properties, frequency characteristics and stress dependence. The dynamic modulus decreases with increasing void fraction or temperature and increases with increasing surrounding pressure or loading frequency. The dynamic modulus has strong frequency characteristics at low temperatures and stress dependence at high temperatures. The phase angle reflects that the viscoelastic characteristics of porous asphalt change differently under different conditions. With the increase of temperature, the viscosity characteristics become more obvious. When the temperature rises to 25 ℃(40 ℃) respectively at high frequency (low frequency), the viscosity characteristics gradually weaken. The increase of confining pressure will enhance the elastic characteristics of porous asphalt, while the increase of air voids can make the viscosity characteristics obvious. At low temperature, the viscosity hysteresis characteristics of porous asphalt abates with the increase of loading frequency, but it is opposite at high temperature.

Key words： porous asphalt dynamic modulus phase angle triaxial compression test influence factors grey correlation degree

Published: 10 July 2022 Online: 2022-07-12

CLC number:

U414

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	ZHOU Zhigang
	ZHOU Yang
	LIU Zhiren

Cite this article:

ZHOU Zhigang,ZHOU Yang,LIU Zhiren. Analysis of Influencing Factors on Dynamic Modulus of Porous Asphalt[J]. Materials Reports, 2022, 36(13): 21010221-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21010221 OR http://www.mater-rep.com/EN/Y2022/V36/I13/21010221

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