Abstract
Abstract To study the influence of basalt fibers on the viscoelastic mechanical properties of asphalt concrete (AC) mixtures, unconfined compressive dynamic modulus tests were performed on styrene–butadiene–styrene (SBS)-modified AC mixtures reinforced with various contents of basalt fibers ranging from 0.2 to 0.5% by weight at five temperatures and six load frequencies, and the dynamic moduli and phase angles of the mixtures were measured. Compared with the test results of the control mixture (with no basalt fibers), the data show that the high-temperature dynamic modulus of the mixtures initially increases and subsequently decreases with increasing fiber content and reaches its maximum value when the basalt fiber content is 0.3%, while the low-temperature dynamic modulus decreases monotonically with increasing fiber content. Furthermore, the phase angle of the mixtures initially decreases and later increases with increasing fiber content and reaches its minimum value when the basalt fiber content is 0.3%. These behaviors indicate that the addition of basalt fiber improves the high-temperature rutting resistance and low-temperature cracking resistance of the SBS-modified AC mixtures. In addition, the results of the wheel rut test exhibit a good correlation with the results of the dynamic modulus test, revealing the reliability of the dynamic modulus test for evaluating the high-temperature rutting resistance of basalt-fiber-reinforced AC mixtures.
Highlights
High-temperature rutting and low-temperature cracking are the two most predominant types of distress in road pavement, shortening the service life of the pavement and increasing the maintenance cost
Apeagyei [11] conducted dynamic modulus tests at 38°C and flow number (FN) tests at 54°C on 16 asphalt concrete (AC) mixtures, and the results showed that the FN was significantly correlated with ∣E∗∣, and that ∣E∗∣ could be a potential rutting specification parameter
The aim of this paper is to study the influence of basalt fiber content on the viscoelastic mechanical properties of SBS-modified AC mixtures and determine the optimal fiber content
Summary
High-temperature rutting and low-temperature cracking are the two most predominant types of distress in road pavement, shortening the service life of the pavement and increasing the maintenance cost. Various studies have demonstrated that adding different types of fibers and polymers to asphalt concrete (AC) could be an effective method for postponing the deterioration of AC pavement and increasing the service life [1,2,3]. It has been reported that adding short basalt fibers into AC can enhance the low-temperature crack resistance, high-temperature rutting resistance, and water stability of AC mixtures [4,5,6]. The report of the National Cooperative Highway Research Program (NCHRP) of the United States suggests that the dynamic modulus (∣E∗∣) and rutting indicator (∣E∗∣/sinδ) can evaluate the high-temperature rutting resistance and fatigue resistance of AC mixtures well [8]
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