Evaluation of Fatigue and Rutting Behaviour of Hot Mix Asphalt Containing Rock Wool
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RESEARCH PAPER
Evaluation of Fatigue and Rutting Behaviour of Hot Mix Asphalt Containing Rock Wool Hamid Behbahani1
•
Vahid Najafi Moghaddam Gilani1
•
Reza Salehfard1 • Daniel Safari1
Received: 6 January 2020 / Revised: 24 April 2020 / Accepted: 2 June 2020 Iran University of Science and Technology 2020
Abstract The objective of this study is to evaluate the effects of adding rock wool fibres on the improvement in the dynamic properties of the hot mix asphalt. To this aim, the effects of 0.2, 0.4, 0.6, and 0.8 of percent rock wool fibres by weight of mixture on the dynamic properties of asphalt mixtures were evaluated. Accordingly, indirect tensile stiffness modulus, indirect tensile fatigue and repeated load axial tests were performed to measure the stiffness modulus, fatigue life and rutting resistance of asphalt mixtures. The fatigue life of modified mixtures with different concentrations of rock wool increased 4%, 32%, 35% and 65% at 25 C with regard to control, respectively. Furthermore, adding 0.8% of Rockwool resulted in 84% and 130% increased in resistance to permanent deformation at the stress of 150 kPa and 300 kPa, respectively. Consequently, incorporation of rock wool in asphalt mixture can be beneficial as it enhances the performance of road pavements against distresses such as rutting and fatigue cracking. Keywords Rock wool fibre Hot mix asphalt Fatigue life Stiffness modulus Repeated load axial
1 Introduction Pavement construction is one of the most costly works in the field of transportation. Most of the pavements throughout the world are made of bitumen [1]. This fact is a reason for conducting researches about pavement materials. Increasing traffic volume and climate varieties have significant effects on asphalt mixture properties such as fatigue resistance, resistance to rutting, and flexibility [2, 3]. Therefore, the lack of resistance causes deterioration in the pavement. At low temperatures, pavement often cracks, especially when it is under traffic load, also deformation and rutting appear with rising ambient & Hamid Behbahani [email protected] Vahid Najafi Moghaddam Gilani [email protected] Reza Salehfard [email protected] Daniel Safari [email protected] 1
School of Civil Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
temperature. The modification of bitumen and asphalt mixture increases pavement quality and its service life; hence, pavement maintenance costs reduce [4–8]. Researchers have used additives to enhance the performance of asphalt mixture; one of those additives is fibre, which has drawn the attention of specialists due to its convenience. The fibres that had been used in asphalt mixtures are designated as steel [9, 10], basalt fibres [11], polypropylene fibres [12, 13], glass fibres [14], natural fibres [15, 16], and thermoplastic fibres [17]. Generally, fibres are classified as synthetic (glass, carbon, and polymer) and natural (hemp, coir, jute,
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