Laboratory assessment of the performance and elastic behavior of asphalt mixtures containing steel slag aggregate and sy
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
Laboratory assessment of the performance and elastic behavior of asphalt mixtures containing steel slag aggregate and synthetic fibers Adham Mohammed Alnadisha*, Mohamad Yusri Amana, Herda Yati Binti Katmanb, Mohd Rasdan Ibrahimc a Department
of Civil Engineering and Built Environment, Universiti Tun Hussein Onn Malaysia, Parit Raja 86400, Malaysia b Department of Civil Engineering, Universiti Tenaga Nasional, Kajang 43000, Malaysia c Department of Civil Engineering, Universiti Malaya, Kuala Lumpur 50603, Malaysia Received 18 May 2020; received in revised form 5 September 2020; accepted 26 September 2020
Abstract
This study focused on the assessment of the performance of fiber-modified asphalt mixtures containing steel slag aggregates. The asphalt mixtures incorporating coarse steel slag aggregate were reinforced with three types of synthetic fibers polyvinyl alcoh ol, acrylic and polyester at the dosage of 0.3% by weight of the aggregates. The performance tests were resilient modulus, rutting resistance, moisture sensitivity and crack ing resistance. The results showed that the resilient modulus of the reinforced mixtures was slightly lower than the reference mixtures at all frequencies. Additionally, the rut depth of the reinforced mixtures was lower than the reference mixtures due to the densification. Otherwise, the reinforced asphalt mix tures showed better resistance to rutting than the control mixtures after excluding the deformation caused by the densification. The indirect tensile streng th and tensile strength ratio of the reinforced asphalt mixtures were higher than the mixture containing steel slag aggregate. The cracking resistance of the reinforced mixture was the best in comparison with the other mixtures at the applied load at the high frequencies. While the reinforced asphalt mixtures showed the worst resistance to cracking at the applied load with low frequency of 2.5 Hz. Keywords: Polyvinyl alcohol; Acrylic; Polyester; Steel slag; Elastic behavior; Permanent deformation; Cracking
1. Introduction The utilization of waste materials in the pavement engineering applications has been documented as an effective approach to preserve the environment and natural resources. One of the wellknown waste materials is steel slag aggregate, which is a byproduct of steel making. Steel slag aggregates have been widely utilized in pavement construction due to its sustainable and environmental benefits. However, several studies have investigated the performance of the asphalt mixtures incorporating steel slag aggregate as a replacement to the natural aggregates [1-5]. The studies concluded that the asphalt mixes incorporating coarse steel slag aggregate showed the best performance than the other substitutions. The enhancements in the performance of the asphalt mixtures were attributed to the angular shape of the steel slag aggregates which improves the interlocking between the aggregates. Also, the high density of
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