Abstract
The aim of this study is to assess the viscoelastic parameters (i.e., phase angle and dynamic modulus) of asphalt concrete-wearing course (AC-WC) and hot rolled sheet-wearing course (HRS-WC) mixtures obtained from the dynamic modulus test. This study was accomplished in four stages: determining optimum asphalt content using Marshall mix design procedure, stability and flow parameters from Marshall test, viscoelastic parameters from dynamic modulus testing and finally the generation of dynamic modulus master curves at a reference temperature of 25 °C. The results showed that at the same temperature, the dynamic modulus of AC-WC and HRS-WC mixtures tended to increase with escalating the loading frequency, while dynamic modulus decreases with an increase in the test temperature at constant loading frequency. Furthermore, the dynamic modulus of the AC-WC mixture was recorded as 100% higher than the HRS-WC asphalt mixture. The phase angle, however, showed contradictory behavior with that shown in dynamic modulus. The phase angle of the AC-WC mixture and HRS-WC asphalt mixture showed almost the same behavior. Similarly, the dynamic modulus master curves of AC-WC and HRS-WC asphalt mixtures can be used to predict the dynamic modulus at the frequency range of 0.01 to 10 Hz and a reference temperature of 25 °C. The results were also used to evaluate the rutting and fatigue performance of AC-WC and HRS-WC.
Highlights
Wearing course from asphalt concrete and hot rolled sheet have different gradations, i.e., well-graded and gap-graded, respectively
The results indicate that asphalt concrete-wearing course (AC-WC) asphalt mixtures have higher dynamic modulus than that of hot rolled sheet-wearing course (HRS-WC)
The results indicate that asphalt concrete (AC)-WC asphalt mixtures have higher dynamic modulus than that of hot rolled sheet (HRS)-WC asphalt mixture at both conditions, i.e., at a low temperature-high frequency and high temperature-low frequency
Summary
Wearing course from asphalt concrete and hot rolled sheet have different gradations, i.e., well-graded and gap-graded, respectively. Asphalt mixture is a viscoelastic material, which has viscous and elastic behavior depending on temperature and time/or loading frequency [1,2,3,4,5,6,7]. The viscoelastic characteristic of asphalt mixtures can be ascertained using dynamic modulus testing [6,8,9]. One of the dynamic modulus testing is the Asphalt Mixture Performance Tester (AMPT). The relationship between stress and strain is demonstrated by complex dynamic modulus (|E*|) when. Materials 2020, 13, 1133 subjected to sinusoidal loading. The absolute value of the complex modulus is generally called the dynamic modulus [6,11,12,13,14,15,16]
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