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All Journal J-Sil (Jurnal Teknik Sipil dan Lingkungan) Civil Engineering Dimension Jurnal Irigasi Journal of the Civil Engineering Forum Electronic Journal of Education, Social Economics and Technology
Muhammad Fauzan
Department Of Civil And Environmental Engineering, IPB University, Bogor, INDONESIA
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Nursing Public Health Social Sciences Transportation Veterinary Other

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Modelling Economic Behavior of Smallholder Households in Coastal Areas of Yogyakarta Indonesia Muhammad Fauzan; Yusman Syaukat; Nunung Kusnadi; Lukman Mohammad Baga
Electronic Journal of Education, Social Economics and Technology Vol 6, No 1 (2025)
Publisher : SAINTIS Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33122/ejeset.v6i1.537

Abstract

Factual conditions show that adopting coastal agricultural technology in Yogyakarta, Indonesia, has not met expectations. As the decision-makers of adoption, smallholder households are rational economic entities acting as producers and consumers who maximize utility and profit from their farm production. Specifically, this study is the first attempt to build an economic model of smallholder households that integrates technology adoption components in Indonesia. The model is also used to analyze the impact of input and output price policies on technology adoption, production, and labor allocation. This study uses primary data collected by survey method on 196 farmer respondents. Data were estimated using the two-stage least square (2SLS) method. The study findings reveal that higher farm output prices catalyze a series of beneficial agricultural outcomes, including expanding cultivated land, optimized input allocation, augmented production processes, and adopting innovative technologies. Fertilizer price subsidy policies have also proven practical policy tools to improve agricultural productivity.
Effect of Relative Density Variation on The Effectiveness of Fly Ash in Stabilization of Sandy Soils for Liquefaction Mitigation Yunan Yakuta Wangsawitana; Muhammad Fauzan; Heriansyah Putra; Erizal; Minson Simatupang
Journal of the Civil Engineering Forum Vol. 12 No. 3 (September 2026)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.26551

Abstract

Indonesia is highly vulnerable to earthquakes that can trigger soil liquefaction, particularly in coastal regions where saturated sandy soils with low relative densities are prevalent. This study investigated the influence of varying Class C fly ash contents (5%, 10%, and 15%), relative densities (50%, 70%, and 90%), and curing periods (7 and 14 days) on the unconfined compressive strength of fully saturated sandy soils as a liquefaction mitigation approach. The methodology included physical soil characterization, sample preparation with specific fly ash and relative density variations, and unconfined compressive strength testing after the curing period. The results demonstrated that increasing the fly ash content, relative density, and curing time significantly enhanced the strength of the samples. The highest strength occurred at 15% fly ash and 90% relative density, with 426.22 kPa (7 days) and 438.57 kPa (14 days). The most notable improvement occurred with an increase in fly ash content from 5% to 10% and relative density from 50% to 70%. Fly ash was more effective at enhancing the strength of sandy soil by promoting interparticle cementation, whereas excessive compaction tended to disrupt the soil structure and generate fine particles that reduced cohesion, as evidenced by the UCS test results and SEM observations. The most significant strength gain between 7 and 14 days was observed at 50% relative density and 5% fly ash, with a twofold increase. The combination of 10% fly ash and 70% relative density was optimal for field implementation, as it yielded strength values exceeding the liquefaction resistance thresholds, while maintaining practical compaction levels and material efficiency. A comparative cost assessment considering materials, labor, equipment, and construction time is recommended to evaluate the practical feasibility of fly ash stabilization relative to alternative ground improvement methods for Indonesian projects.
Co-Authors Achmad Hafidz Aditya Fajar Meidiansyah Aini Maryam Ridwan Annisa Daniswara Asep Sapei Dzaky Syifaurrahman Erizal Hideaki Yasuhara I Wayan Wirya Aristyana Khairat Mantani Lukman Mohammad Baga M. Yanuar J. Purwanto Minson Simatupang Naoki Kinoshita Nunung Kusnadi Purwo Mahardi Putra, Heriansyah Rifqi Fauzi Dhiaulhaq Sekar Mentari Tri Sudibyo Yunan Yakuta Wangsawitana Yusman Syaukat