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All Journal Inersia : Jurnal Teknik Sipil Abdi Reksa Jurnal Polimesin
Yuzuar Afrizal
Universitas Bengkulu
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Analisis Kekuatan Kolom Komposit Terbungkus Beton Berpenampang Bundar terhadap Kapasitas Tahanan Aksial dan Momen dengan Metode Beda Hingga Rizki Aidil; Mukhlis Islam; Ade Sri Wahyuni; Agustin Gunawan; Yuzuar Afrizal
Inersia: Jurnal Teknik Sipil Vol. 16 No. 1 (2024)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/ijts.16.1.21-28

Abstract

Composite column structures can provide high strength from the combination of two or more materials with different material properties which then provide better combined properties. This research was conducted by analysing the composite column structure with finite difference method and comparing the results with CSiCol application. The results of the analysis of   the Pn and Mn interaction diagram of the finite difference method composite column when compared to the CSiCol application composite column have a maximum percentage difference for the maximum Pn value of 19.17%, the maximum Mn value of 2.90%. The difference in the Pn and Mn values of  the composite column can be corrected with a regression equation using a linear correction factor and a Polinomial correction factor, with a maximum Pn percentage difference value of 8.93% for the linear correction factor and 6.84% for the Polinomial correction factor value. Therefore, the finite difference method can be used to analyse composite columns with relatively good accuracy provided that correction factors are used.    
The Compressive Strength of Geopolymer Mortar with the Alkali Silica Ratio of 2.5 Revanska Harbyansyah; Ade Sri Wahyuni; Agustin Gunawan; Mukhlis Islam; Yuzuar Afrizal
Inersia: Jurnal Teknik Sipil Vol. 18 No. 1 (2026)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/ijts.18.1.36-41

Abstract

The cement industry accounts for approximately 7% of global CO₂ emissions, driving the development of environmentally friendly alternatives such as geopolymer concrete. Geopolymers are formed from silica (SiO₂) and alumina (Al₂O₃) rich materials that are reacted with an alkaline solution. This study utilized fly ash from Teluk Sepang Power Plant in Bengkulu to prepare geopolymer mortar. Seventy-two 5×5×5 cm cubic samples were prepared with 2,5 ratio of sodium silicate to sodium hydroxide (SS/SH) and 8M NaOH. The curing process was carried out at ±80°C for 24 hours. The results showed that calcination of fly ash significantly increased the initial compressive strength. On day 7, the compressive strength reached 92.9% of the 28-day age, with a final value of 38.1 MPa. Mortar with calcined fly ash showed a compressive strength 97.7% higher on day 7 compared to normal fly ash, and 11.5% higher on day 28. Additionally, the setting time of the mortar was reduced by 46.8% with calcination. The pattern of compressive strength development from calcined fly ash tended to be stable from the beginning, unlike normal fly ash.   Keywords: Geopolymer Mortar, Calcination, Fly Ash, Compressive Strength
Analysis of Unsignalized Intersection Performance on Jl. Dr Sutomo, Baturaja City Samsul Bahri; Annisa Mawarda; Yuzuar Afrizal; Makmun Reza Razali; Gusta Gunawan
Inersia: Jurnal Teknik Sipil Vol. 18 No. 1 (2026)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/ijts.18.1.14-27

Abstract

An unsignalized intersection is the meeting point of several road approaches without traffic signal control. The vehicle control mechanism is implemented through traffic signs and priority rules. Problems arise when traffic volume increases. Vehicles will cross each other, so conflicts between vehicles are becoming more frequent. The unsignalized intersection on Jl. Dr. Sutomo is a four-leg intersection with traffic flow levels that continue to increase. The purpose of this study is to analyze the performance of the unsignalized intersection using the method of The Indonesian Road Capacity Guidelines (PKJI) 2023. Data collection was carried out through field surveys for three days. Observations were conducted during peak hours, namely in the morning from 07:00 to 09:00 WIB, at midday from 12:00 to 14:00 WIB, and in the afternoon from 16:00 to 18:00 WIB. The results show that the unsignalized intersection on Jl. Dr. Sutomo, Baturaja City, has a capacity of 3446 passenger car unit (PCU)/hour. The highest traffic flow occurred on Monday at 08:30–08:45 WIB at 2932 PCU/hour with a degree of saturation of 0.85. Vehicles experienced a travel delay of 94.52 seconds/PCU and the vehicle queue probability ranged from 29% to 57%. This condition places the intersection at Level of Service C. Vehicles are dominated by higher traffic flows on the major road, with stable movements. There is an increase in internal movement friction, which causes traffic density to be at a moderate level. This condition makes drivers experience difficulty in increasing speed and overtaking each other. Keywords: unsignalized intersection, degree of saturation, delay
Co-Authors Ade Sri Wahyuni Adika Kurniawan Aditia Wiranata Agustin Gunawan Agustin Gunawan Anggita Yuliani Annisa Mawarda Candy Juyetzu Elhusna Elhusna Fatmawati Fatmawati Fepy Supriani Gusta Gunawan Hardiansyah Hardiansyah Hendri Hestiawan Junas Haidi MAKMUN REZA RAZALI Martin Lerry mawardi mawardi Mukhlis Islam Olandri Wijaya Revanska Harbyansyah Rio Saputra Rizki Aidil Samsul Bahri