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Program Studi Teknik Sipil, Fakultas Teknik Universitas Bengkulu Jl. W.R. Supratman, Kandang Limun, Bengkulu
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INDONESIA
Inersia : Jurnal Teknik Sipil
Published by Universitas Bengkulu
ISSN : 20869045     EISSN : 26865017     DOI : https://doi.org/10.33369/ijts
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Each volume contains two editions. The first edtion is published in April and the second one in October. This journal accomodates the research result in the area of civil engineering, i.e. Construction Management, Geotechnical Engineering, Structural Engineering, Transportation Engineering and Water Resources Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 6 Documents
 1 
Search results for , issue "Vol. 18 No. 1 (2026)" : 6 Documents clear
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
An Analysis of Walking Permeability, Walking Effort, and the Walkability Index: A Case Study of the Dayang Sumbi Entrance, Institut Teknologi Bandung (ITB) Ammar Asyraf; Edlin Al Khuzaifah Hasbi; Irwandra Septiadi
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.18.1.1-13

Abstract

Human mobility in Bandung City cannot be avoided. Congestion and travel distance make walking a popular choice. Accessibility is measured by walking distance (400–800 m) and walking time (10–15 minutes). Route characteristics affect walking effort, determining accessibility quality. Ganesha Campus ITB, especially Dayang Sumbi Gate, has high pedestrian traffic. This study assesses walkability using Permeability Framework, Walking effort approach, and Walkability Index. Results shows the route to McDonald's Dago via Jl. Sumur Bandung has the highest Walking Effort and Permeability: 3155 m (normal)–2300.26 m (opposite) and 5.836 (normal)–4.939 (opposite). The best road by walkability index is Jl. Ir. H. Djuanda While the Worsts one is Jl. ITB IX.
Evaluation of Bore Pile Integrity Based on UDM (Ultrasonic Drilling Monitor) and PIT (Pile Integrity Test) on the Cibogo Main Bridge of the Bocimi Toll Road Project Septiani Nur Fadillah; Sudjani
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.18.1.29-35

Abstract

This study aims to determine the condition of the bore pile hole based on the test results and to determine the integrity of the bore pile based on the results of the PIT test on the Cibogo Main Bridge, Bocimi Toll Project. The data collection techniques used in this study by the author are observation, interview, document review, and literature review. The results of the study are at points P05-B06 and P05-B30 which have been tested with UDM and PIT tests, it can be evaluated that the UDM of both points meets the maximum limit requirements of 2%, namely 0.23% (X-X') and 0.23% (Y-Y') and 0.64% (X-X') and 0.52% (Y-Y'). Then the PIT test can produce an evaluation that meets the requirements of ASTM D5882-07, namely the integrity of the pile is classified as Class I, which means Good Pile, and Class II, which means Slightly Damaged. Keywords: Bore Pile, UDM, PIT
The Effect of Polyethylene Terephthalate as an Additive on the Marshall Parameters of Asphalt Concrete Wearing Course (AC-WC) Mixtures at Ambient Temperature Rhiza Afriady; Said Jalalul Akbar; Maizuar
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.18.1.42-47

Abstract

Indonesia’s tropical climate, characterized by high temperatures and fluctuating humidity, presents a major challenge to the service life of pavements, as it accelerates asphalt aging and reduces the performance of the Asphalt Concrete–Wearing Course (AC-WC), the primary protective layer against traffic loads. This study investigates the effectiveness of Polyethylene Terephthalate (PET) waste as a modifying additive to enhance the resistance of AC-WC under ambient temperature conditions. Test specimens were prepared with 3% PET by asphalt weight and evaluated in accordance with Indonesian National Standards (SNI) and the 2018 Bina Marga General Specifications. The samples were exposed to temperatures of 23.77°C–31.11°C and an average humidity of 88.79% for periods of 0, 15, 30, 45, 60, 75, and 90 days, followed by stability, flow, and Marshall Quotient (MQ) testing. The results showed a stability increase of 13.74% at day 30, followed by a 16.81% decrease at day 90. Flow increased by an average of 19.70%, while MQ decreased by 15.75%. The mixture met the specification requirements for stability and MQ, but flow exceeded the limit after day 45. These findings confirm that PET can improve the early performance of AC-WC in tropical climates, although further optimization is required to control long-term plastic deformation.  Keywords: Polyethylene terephthalate, AC-WC, Marshall parameters, ambient temperature, tropical climate.
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
Analysis of the Operational Management System for Clean Water Distribution in Permanent Residences after Disasters in Huntap Talise, Palu City andi asnudin; Nofriyanto; Vera Wim Andiesse; Iffah Fadliah
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.18.1.23-28

Abstract

Sustainable clean water provision in post-disaster permanent housing (huntap) is a fundamental prerequisite for public health recovery and socio-economic restoration. However, comprehensive evaluations of operational management systems for water distribution from a socio-technical perspective remain scarce in disaster literature. Objective: This study analyzes the operational management system of clean water distribution in Huntap Talise, Palu City, following the 2018 multi-hazard disaster, examining infrastructure performance, user satisfaction, and institutional dynamics.  The research employed an explanatory sequential mixed-method design. Quantitative data were collected through surveys of 88 randomly selected households (Slovin formula, α=10%) and analyzed using the Relative Rank Index (RRI) and Spearman's Rho correlation test. Qualitative data were gathered through field observations, in-depth interviews, and focus group discussions, and were then analyzed thematically.  The study revealed dissonance between technical capacity and operational reality. The inflow discharge (22.22 L/sec) theoretically meets the total demand (520,500 L/day). However, RRI identified three critical deficiencies: 24-hour flow continuity (RRI=0.3045), speed of disturbance repair (RRI=0.3227), and disruption frequency (RRI=0.3295). Correlation analysis showed continuity strongly associated with reduced disruptions (r=0.581; p<0.001). Qualitatively, institutional pathologies emerged: ambiguous management status, lack of preventive maintenance, and a design that depends on limited household tank capacity. Conversely, voluntary contribution compliance reached 97%, indicating robust social capital.  This study confirms that post-disaster water system effectiveness is determined not solely by technical sufficiency, but by governance quality and institutional responsiveness. A socio-technical approach integrating institutional strengthening, operational professionalization, and the utilization of social capital is essential for achieving water system resilience in post-disaster permanent housing.  Keywords: Clean Water Distribution, Post-Disaster Permanent Housing, Operational Management, Community Satisfaction, Infrastructure Resilience, Socio-Technical Analysis    

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