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All Journal Journal of Infrastructure and Facility Asset Management
Noor Endah Mochtar
Civil Engineering Departement, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia.
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Energy Engineering Environmental Science Library & Information Science Mathematics Transportation

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Analysis of the Use of a Combination of Soil Embankment and Lightweight Material (Foam Mortar) as an Alternative to Slab on Pile Construction Case Study: Rengat-Pekanbaru Toll Road Construction Project Section Lingkar Pekanbaru-Junction Pekanbaru Sta 19 Wahyu Maya Dewatama; Noor Endah Mochtar; Indrasurya B. Mochtar; Mahar Muliawan
Journal of Infrastructure & Facility Asset Management Vol 7 (2025): Special Issue 1 : Journal of Infrastructure & Facility Asset Management
Publisher : Departemen Teknik Sipil, Institut Teknologi Sepuluh Nopember

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The soil condition on the Rengat - Pekanbaru Toll Road Sta 193+ 025 - Sta 193+400 which passes through oil palm plantations, swamp areas, and the Siak River, consists of a compressible layer as thick as 7.0 meters. To handle the problem, a 375 m long slab on pile construction was planned with a construction time of 3 months. However, the design was costly; therefore, alternative planning using ordinary piles and a combination of ordinary and lightweight piles was required. The rate of settlement at the study site did not meet the requirements for t = 1 year (< 2cm/year) or t = 10 years (< 10cm/10 years). Therefore, it is necessary to install PVDs with an installation distance of 1.0 meter and a length of 7.0 m. The stability analysis showed that as the percentage of foam mortar increases, the SF value increases. The bearing capacity of the subgrade was increased by installing geotextiles; the number of geotextile layers required at each site varied depending on the height of the embankment and the combination of soil + foam mortar, the thicker the foam mortar, the less geotextile layers were required. The number of reinforcing piles was also planned according to the thickness of the soil and foam mortar variations; the thicker the foam mortar, the less piles were required. In terms of cost, the slab on pile replacement structures that provide savings are geotextile-reinforced soil backfill and a combination of soil backfill with 25% thick foam mortar. Each of these replacement structures provides savings of Rp 40 billion (without foam mortar) and Rp 12.1 billion (with 25% thick foam mortar). For the implementation time, both methods require the same completion time as slab on pile which is 3.5 months.
Slope Design for Cost Optimization of Slope Cutting and Reinforcement (Case Study: Trans-Sumatra Toll Road Rengat Pekanbaru Section Lingkar Pekanbaru Junction Pekanbaru Sta. 205+150 - 205+725) R Fiansyah Dwi Prasetiyo; Noor Endah Mochtar; Indra Surya B Mochtar; Mahar Muliawan
Journal of Infrastructure & Facility Asset Management Vol 7 (2025): Special Issue 1 : Journal of Infrastructure & Facility Asset Management
Publisher : Departemen Teknik Sipil, Institut Teknologi Sepuluh Nopember

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Analysis of Temporary Preloading for Bridge Approach Embankment to Eliminate Secondary Compression Case Study: Probolinggo – Banyuwangi Toll Road Construction Project Section 3 STA 40+550 Muhammad Rizal Permadi; Indrasurya B. Mochtar; Noor Endah Mochtar; Reza Kazhimi
Journal of Infrastructure & Facility Asset Management Vol 7 (2025): Special Issue 3 : Journal of Infrastructure & Facility Asset Management
Publisher : Departemen Teknik Sipil, Institut Teknologi Sepuluh Nopember

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Probolinggo - Banyuwangi Toll Road is part of the National Strategic Project, has a length of 172 km which is divided into 7 sections. One of the challenges faced is soft soil, where information is obtained in section 3 precisely STA 40 + 550 there is soft soil, which has low bearing capacity and high compressibility. The depth of the soft soil itself reaches 10 meters, with the plan to build in the approach bridge area which has a 10 meter high embankment. Considering the high embankment, based on previous studies, it is estimated that the amount of primary and secondary compression generated is quite large. This study analyzes primary, and secondary compression in bridge approach embankments built on soft soil, focusing on eliminating secondary compression using the preloading method, while the primary compression time is accelerated using Prefabricated Vertical Drains (PVD). Primary consolidation results in a 1.35-meter settlement, and secondary settlements vary over 20 years. From the analysis, it is found that the annual rate of secondary settlements decreases after year 10, so it is considered that the year 10 settlements are eliminated. To eliminate these settlements at year 10 of the operational period, the required embankment height increases by up to 13.60 meters of granular backfill, preloading of 4.49 t/m2 is equivalent to 2.26 m, and the height of the embankment to be demolished is 1.85 m.
Co-Authors Indra Surya B Mochtar Indrasurya B. Mochtar Mahar Muliawan Mahar Muliawan Muhammad Rizal Permadi R Fiansyah Dwi Prasetiyo Reza Kazhimi Wahyu Maya Dewatama