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Bahtiar
Universitas Cenderawasih
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Pengaruh Penambahan Filler Fly Ash PLTU Holtekamp dan Filler Karang Koya terhadap Campuran Aspal Panas Lataston (HRS-WC) Anddy Santoso; Bahtiar; Monita Yessy Beatrick Wambrauw; Duha Awaluddin Kurniatullah; Ira Widyastuti
Jurnal Impresi Indonesia Vol. 5 No. 6 (2026): Jurnal Impresi Indonesia
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jii.v5i6.7761

Abstract

Kinerja campuran aspal panas jenis Lataston (Hot Rolled Sheet Wearing Course/HRS-WC) sangat dipengaruhi oleh jenis dan proporsi bahan pengisi (filler) yang digunakan. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan filler Fly Ash PLTU Holtekamp dan filler karang koya terhadap karakteristik Marshall campuran aspal panas HRS-WC, dengan variasi kadar filler sebesar 3%, 3,5%, 4%, 4,5%, dan 5% terhadap berat total campuran. Metode penelitian dilakukan secara eksperimental di laboratorium dengan menggunakan bahan utama agregat kasar, agregat halus, aspal penetrasi 60/70, serta dua jenis filler yaitu fly ash PLTU Holtekamp dan Karang Koya. Pengujian dilakukan berdasarkan prosedur Marshall Test untuk memperoleh nilai stabilitas, flow, Marshall Quotient (MQ), serta parameter volumetrik seperti Void in Mix (VIM), Void in Mineral Aggregate (VMA), dan Void Filled with Bitumen (VFB). Hasil penelitian menunjukkan bahwa penambahan filler Fly Ash dan filler karang berpengaruh terhadap kinerja campuran HRS-WC untuk beberapa variasi penggabungan filler dengan varian nilai kadar aspal optimum 7.75% dan 8.00% serta varian kadar aspal efektif diantara 6.28%-6.53%. Pada penggunaan filler fly ash dengan varian kadar 3% dan 3.5% dan penggunaan filler karang varian kadar 3% dan 3.5% serta penggunaan kombinasi/gabungan filler fly ash dan karang dengan varian kadar 3%, 3.5%, 4% dan 4.5% menunjukan nilai yang memenuhi parameter Spesifikasi Bina Marga 2018 dan dapat digunakan sebagai komposisi bahan campuran HRS-WC. Kesimpulannya adalah bahan fly ash PLTU Holtekamp dan bahan Karang Koya pada beberapa variasi kadar filler dapat digunakan sebagai alternatif filler dalam campuran HRS-WC.
The Effect of Internal and External Project Factors on the Performance of Road Improvement Projects in Papua Province Arnes Richard Kreeuw; Bernathius Julison; Mujiati; Bahtiar; Dewi Ana Rusim
Jurnal Ekonomi Teknologi dan Bisnis (JETBIS) Vol. 5 No. 8 (2026): Jurnal Ekonomi, Teknologi dan Bisnis
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/96n7er83

Abstract

This study aimed to analyze the influence of Internal Project Factors and External Project Factors on the performance of road improvement projects in Papua Province. The research was motivated by the importance of successful road construction projects in supporting regional connectivity, particularly in Papua Province, which faces complex geographical, logistical, and project implementation challenges. Internal factors, including project management, human resource competence, heavy equipment availability, and contractor financial capacity, as well as external factors, such as weather conditions, social factors, and bureaucratic processes, were assumed to influence project performance. The research employed a qualitative approach using a survey method through questionnaires distributed to parties directly involved in road construction projects, including Commitment-Making Officials (Pejabat Pembuat Komitmen or PPK), Technical Activity Implementation Officers (Pejabat Pelaksana Teknis Kegiatan or PPTK), supervisory consultants, and contractors. A total of 196 respondents participated in this study. The data were analyzed using IBM SPSS Statistics 26 through validity testing, reliability testing, classical assumption testing, multiple linear regression analysis, partial significance testing (t-test), simultaneous significance testing (F-test), and coefficient of determination (R²) analysis. The results showed that Internal Project Factors (X1) had a positive and significant effect on Project Performance (Y), whereas External Project Factors (X2) did not have a partially significant effect. Simultaneously, both independent variables significantly influenced project performance. The coefficient of determination (R²) value of 0.434 indicated that the two independent variables explained 43.4% of the variation in project performance, while the remaining 56.6% was influenced by other factors outside the research model.
Analysis of the Effects of Land-Use Changes on Increased Flood Discharge in the Hetuma River Using a Hydrological Approach Unas Tabuni; Mujiati; Bahtiar; Duha Awaluddin Kurniatullah; Bernathius Julison
Jurnal Ekonomi Teknologi dan Bisnis (JETBIS) Vol. 5 No. 8 (2026): Jurnal Ekonomi, Teknologi dan Bisnis
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/paqd3g14

Abstract

Changes in land use due to residential expansion and infrastructure development have increased surface runoff, contributing to higher flood discharge in the Hetuma River, Jayawijaya Regency. This study aimed to analyze the impact of land-use changes on increased flood discharge and develop an optimization model for drainage systems to reduce inundation in Wamena City. The research employed a hydrological approach using the Nakayasu Synthetic Unit Hydrograph (Hidrograf Satuan Sintetis or HSS) method and the Rational Method. The data used included BMKG rainfall records from 2013–2024, topographic data, watershed maps, and land-cover maps from 2015 and 2025. The results showed that forest areas decreased from 217.70 ha to 139.39 ha, while residential areas increased from 177.67 ha to 183.17 ha. These land-use changes increased the runoff coefficient, which subsequently contributed to higher flood discharge. Based on the Nakayasu Synthetic Unit Hydrograph method, the design flood discharge of the Hetuma River reached 20.712 m³/s for the 2-year return period and 26.474 m³/s for the 100-year return period. Meanwhile, the Rational Method results indicated that flood discharge increased from 281.970 m³/s for the 2-year return period to 504.967 m³/s for the 100-year return period. Drainage analysis revealed that several channels in the Hom-Hom area were unable to accommodate runoff discharge due to sediment accumulation and limited channel capacity, requiring channel normalization and dimension improvements. Therefore, land-use changes were proven to contribute to increased flood discharge in the Hetuma River, highlighting the need for land-use management and drainage system optimization to reduce flood risks in Wamena City.
Co-Authors Anddy Santoso Arnes Richard Kreeuw Bernathius Julison Duha Awaluddin Kurniatullah Ira Widyastuti Mujiati Rusim, Dewi Ana Unas Tabuni