Putri Dewi A’isyah, Dian Kusumaningsih

Perencanaan Overlay Jalan Kedungringin-Kedungboto Menggunakan Rigid Pavement Dan Flexible Pavement

Introduction

Perencanaan overlay jalan kedungringin-kedungboto menggunakan rigid pavement dan flexible pavement. Desain overlay Jalan Kedungringin-Kedungboto: bandingkan rigid & flexible pavement. Analisis metode AASHTO 1993 & Pd-T-14-2003, evaluasi biaya, durabilitas, dan masa pakai 20 tahun.

Abstract

Roads are crucial infrastructure supporting public mobility and economic growth. Over time, road pavement structures deteriorate due to increased traffic volume and lack of maintenance. This study aims to design an overlay on the Kedungringin-Kedungboto Road section by comparing two types of pavement structures: rigid pavement and flexible pavement. The method used in this study refers to Pd-T-14-2003 for rigid pavements and the AASHTO 1993 method for flexible pavements, based on the 2017 or 2024 Road Pavement Design Manual (MDPJ). The data used include an Average Daily Traffic (LHR) of 600 vehicles/day, a CBR value of 5% for the subgrade, an assumed design life of 20 years, and the existing condition of the pavement structure. The calculation results using the AASHTO 1993 method obtained a Structural Number (SN) value of 2.8, which was then converted into a flexible pavement overlay layer with a total thickness of 10 cm, consisting of AC-BC (Base Course) and AC-WC (Wearing Course) layers. Meanwhile, the Pd-T-14-2003 method produced a concrete slab thickness of 20 cm, with stress and fatigue evaluation results indicating a working stress value (σ) of 3.75 MPa < concrete flexural strength (fₜ) of 4.5 MPa, and Df = 0.438 <1, thus the structure is declared safe from fatigue cracking. From the analysis results, flexible pavement is considered more economical in terms of initial costs, while rigid pavement has advantages in durability, design life, and resistance to repeated loads over a long period.

Review

This study addresses a highly relevant issue in infrastructure engineering by undertaking a comparative design for pavement overlay on the Kedungringin-Kedungboto Road. The research clearly articulates its objective: to design an overlay using both rigid and flexible pavement approaches, driven by the common problem of deteriorating road structures due to traffic and maintenance deficits. The chosen methodology, employing the Indonesian standard Pd-T-14-2003 for rigid pavements and the well-established AASHTO 1993 method for flexible pavements, provides a robust framework for comparing these two fundamental pavement types. This dual approach offers practical insights for decision-makers grappling with choices that impact both initial investment and long-term performance of road networks. The abstract effectively presents the key findings and design parameters. With an average daily traffic of 600 vehicles/day and a subgrade CBR of 5% over a 20-year design life, the study produced concrete overlay thicknesses: a 10 cm flexible pavement (AC-BC and AC-WC) and a 20 cm rigid concrete slab. Crucially, the rigid pavement design was verified for safety against fatigue cracking, demonstrating a working stress well below flexural strength and a fatigue damage factor (Df) less than one. The analysis astutely highlights the economic dichotomy: flexible pavement presents a lower initial cost, while rigid pavement offers superior durability, extended design life, and enhanced resistance to repeated loading. This trade-off is a central and valuable contribution of the study. While the study provides a strong foundation for design, a more comprehensive economic analysis, such as a full Life-Cycle Cost Analysis (LCCA), would further strengthen the comparison beyond just initial costs, incorporating maintenance, rehabilitation, and user delay costs over the 20-year design life. Additionally, discussing the practical implications of each pavement type in terms of construction period, availability of local materials, and potential environmental impacts could enrich the findings. Nevertheless, this research delivers valuable preliminary design insights for the Kedungringin-Kedungboto Road, offering a clear comparative assessment of rigid and flexible pavement overlays. Its findings are directly applicable to local road authorities and serve as a useful reference for future pavement design projects in similar contexts.

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