Journal of Transportation Research

Journal of Transportation Research

Design of Flexible Pavement Using Recycled Surface and Cement-Stabilized base with the Use of WR2000 Machine (Case Study: Qom City)

Document Type : Original Article

Authors
Seyyed Mohammad Hossein Dehnad 1
Mohsen Karimian 2
Abulfazl Kheyrkhah 3
Mehdi Hodayi 4
1 Assistant Professor, Department of Civil Engineering, University of Qom, Qom, Iran.
2 Ph.D., Student, Department of Civil Engineering, University of Qom, Qom, Iran.
3 M.Sc., Student, Department of Civil Engineering, University of Qom, Qom, Iran.
4 B.Sc., Grad., Department of Civil Engineering, University of Qom, Qom, Iran.
10.22034/tri.2025.487126.3299
Abstract
As a consequence of vehicular traffic and various forms of damage, the enhancement and repair of asphalt pavements have become imperative. Cold in-situ recycling (CIR) has emerged as a contemporary method for the improvement and repair of pavements, gaining popularity in recent years. This technique not only mitigates the substantial annual expenses associated with the provision of machinery and materials in urban settings but also minimizes the disruption to traffic flow on the affected roadways. Nevertheless, layers of recycled asphalt pavement (RAP) often encounter challenges such as raveling, stripping, low initial strength, and prolonged curing times. To address these issues, a range of additives and stabilizing agents, including lime, cement, bitumen emulsion, and recycled materials such as cement kiln dust (CKD), fly ash (FA), and recycled concrete sand (RCS) can be employed. This study presents a laboratory investigation aimed at determining the uniaxial compressive strength of RAP and base material samples, incorporating varying percentages of cement as a stabilizing agent. The optimal cement percentage required to achieve the target design strength of 35 kg/cm² was identified as 7.5%. Furthermore, this research examined the pavement design and enhancement of Khodakaram Boulevard in Qom, utilizing the WR device alongside the established optimal cement content. The WR device facilitates the rapid paving and compaction of stabilized soil while allowing for precise adjustments to the thickness and width of the pavement. This method not only provides the necessary strength and reducing existing asphalt damage but also extends the service life of the pavement compared to alternative techniques. Additionally, the implementation of this method does not disrupt the flow of traffic and contributes to a reduction in repair and improvement costs.
Keywords
Rehabilitation and Stabilization
CIR
WR Machine
Cement
RAP
Subjects
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