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Jurnal Komposit : Jurnal Ilmu-Ilmu Teknik Sipil
Published by Universitas Ibn Khaldun Bogor
ISSN : 35132615     EISSN : 2655934X     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Transportation
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil adalah jurnal yang mempublikasikan hasil-hasil penelitian, ulasan ilmiah, teori dan aplikasi serta informasi lain di bidang ilmu pengetahuan, teknologi, dan sains (IPTekS), terutama teknik sipil, lingkungan, dan perencanaan wilayah-kota.Jurnal Komposit terbit dua kali dalam setahun. Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil is a journal that publishes research results, scientific reviews, theory and applications as well as other information in the fields of science, technology and science (IPTekS), especially civil engineering, environment, and urban planning. Jurnal komposit issued biannually. Articles to be published in the Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil are compiled from articles prepared by the author(s) and sent to the editorial board of Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Departement of Civil Engineering, Faculty of Engineering and Science, Universitas Ibn Khaldun Bogor. Articles should be written in English or Bahasa Indonesia. Research scope in general is civil engineering and environmental engineering study.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 208 Documents
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Subgrade Optimization with Coconut Shell Ash Addition on Glee Gurah Clay Soil Hidayat, Rifki; Azka, Cut Nawalul; Fatimah, Aldina; Firmansyah, Teuku Andrian
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.19087

Abstract

Improving subgrade bearing capacity is a crucial aspect of highway construction. Clay soils, which have high plasticity and low bearing capacity, often require improvement to increase their stability and strength. This research examines the effect of coconut shell ash addition on the bearing capacity of clay soil in Glee Gurah village. The research aims to identify the impact of coconut shell ash stabilization on the mechanical characteristics of clay soil as a highway subgrade, focusing on soil compaction and CBR values. The research was conducted through a series of laboratory tests which included soil classification according to AASHTO and USCS, as well as compaction (Proctor) and CBR testing. The percentage variations of coconut shell ash used were 0%, 3%, 6%, 9%, and 12%. The results showed that the addition of coconut shell ash increased the bearing capacity of clay soil. The maximum dry volume weight increased from 1.464 gr/cm³ (no mixture) to 1.540 gr/cm³ at the addition of 12% coconut shell ash. The optimum moisture content decreased with increasing ash percentage, from 22.70% to 20.20%. The unsoaked CBR value also increased significantly, from 11.06% (no mixture) to 17.78% at the addition of 12% coconut shell ash, with a total CBR percentage increase of 60.80%. Thus, the use of 12% coconut shell ash > 20% (Good), so that ANOVA shows a p value <0.05, which means that the addition coconut shell ash significantly increases the bearing capacity of clay soil and is effective in strength of subgrades with moderate traffic categories. Key words: Stability, clay, Pavement, subgrade
Studi Komparatif Stabilitas Timbunan Tanah dengan Perkuatan Sabut Kelapa Menggunakan Software GeoStudio Slope/W terhadap Hasil PLAXIS Trianto, Adden; Pradhana, Rakhan Dhawy; Fansuri, Muhammad Hamzah
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.19189

Abstract

Infrastructure development often faces slope stability challenges due to suboptimal soil conditions. One possible solution is the use of coconut coir as a soil reinforcement material to improve slope stability. This study analyzes the stability of embankment slopes reinforced with coconut coir using GeoStudio Slope/W 2012 software with the limit equilibrium Method and compares the results with Fahriani's (2016) study, which utilized Plaxis. The analysis was conducted on embankment slopes with varying percentages of coconut coir addition (0%–5%) using five limit equilibrium Methods: Morgenstern-Price, Spencer, Bishop Simplified, Janbu Simplified, and the Ordinary Method of Slices. The results indicate that all analysis Methods show an increase in the factor of safety (FoS) as the percentage of coconut coir increases. The comparison with Plaxis results shows a small FoS difference, ranging from 0.154% at 0% coconut coir to 1.397% at 5% coconut coir, with 0%–3% having a difference of less than 1%, indicating that both Methods provide relatively consistent results. The trend of increasing the factor of safety due to the addition of coconut coir remains similar in both software programs, reinforcing the effectiveness of coconut coir as a slope reinforcement material.
Pengembangan Teori Tekanan Lateral Aktif pada Dinding Penahan Tanah Menggunakan Metode Elemen Hingga Hizbulmalik, Ziyan; Lim, Aswin
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.19223

Abstract

Estimating the value of lateral earth pressure acting on a rigid retaining wall is very important in the design of geotechnical structures. Various theories have been developed to calculate lateral earth pressure, each with it is own methodologies, equations, and assumptions. However, none of the studies above considered the lateral earth pressure equation based on the finite element method. In this study, conventional methods and finite element methods are used to determine the amount of active lateral earth pressure that occurs in the retaining wall, and a finite element method-based equation of active lateral earth pressure is proposed. Parametric experiments were also conducted to determine the active lateral earth pressure distribution's response to various parameters.
The Effect of Waste Flex Banner Fiber on Mechanical Properties of Geopolymer Concrete Maulana, Farhan; Setiawan, Agustinus Agus
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.19259

Abstract

This research aims to design a geopolymer concrete mix with the addition of waste flex banner fiber and to study its effects on various physical and mechanical properties of the concrete. The study focuses on the influence of flex banner fiber on the density of geopolymer concrete, workability with a target slump value of 90 mm, and the compressive and splitting tensile strength with flex banner fiber additions of 0.5%, 0.75%, and 1.0% by weight of fly ash. The research method involves curing the concrete in water for 7, 14, and 28 days. The results indicate that the addition of flex banner fiber increases the density of geopolymer concrete, achieving an optimal density of 2462.83 kg/m³. This study also shows that the workability of the flex banner fiber mix in geopolymer concrete meets the target slump value of 90 mm at a 0.75% fiber addition. As the fiber percentage increases, a significant reduction in slump value occurs. At 0.5% fiber content, the slump value decreases to 110 mm, while at 1% fiber content, the slump value drops to 53 mm. The addition of flex banner fiber improves the mechanical properties of geopolymer concrete. The compressive strength of geopolymer concrete with 0.75% fiber addition increases by 4.19%. Furthermore, the optimal splitting tensile strength is achieved with a 0.61% flex banner fiber addition.
Penanggulangan Timbulan Sampah di Perumahan Bukit Mekar Wangi Menggunakan Bangunan TPS 3R Lutfi, Muhamad; Chayati, Nurul; Alimuddin, Alimuddin; Sidik, Sendi Abduloh; Insan, Muhammad Khaerul; Syaja'ah, Siti Kholifah
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.19273

Abstract

The problem of waste generation in urban areas continues to increase along with population growth. An increase in population of 0.98% in the research location contributed to the high volume of waste. This research aims to get a design, especially in the layout, structural analysis of the 3R Waste Temporary Shelter (TPS) building and cost budget plan (RAB). In the process of building a TPS 3R building, several technical aspects are considered in order to determine the layout of the building and the strength of the building construction so that it can function optimally. The method used uses structural analysis calculations, while checking beams and columns using ETABS ver.21 software. Based on the structural analysis, the TPS 3R building is planned with dimensions of 19.3 × 4.2 m using reinforced concrete material with a roof covering structure in the form of a concrete deck. The structural material specifications used are concrete with a quality of 22.84 MPa and the yield quality of reinforcing steel (fy) 420 MPa. The dimensions of the column structural elements are K30x30 cm, B20x40 cm main beam and 12 cm thick concrete slab. The structural analysis output of the planned building shows purple-colored columns with a strength ratio of 0.90 to 0.95, indicating that the structure is reasonably safe against working loads. Meanwhile, the black-colored beams indicate that the structure is safe against the working load. Keywords: Waste generation, TPS 3R, Structural analysis.
Analysis of the Effect of Evaluation and Innovation in the Development of Construction Safety Culture on the Safety Leadership Model using SEM Approach Taqwa, Fadhila Muhammad Libasut; Priyambodo, Bambang; Subkhan, Subkhan; Naibaho, Pio Ranap Tua
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.20134

Abstract

In the construction sector, the Construction Safety Management System (SMKK) has been determined by the Regulation of the Minister of Public Works No. 10 of 2021 as a reference for addressing the risk of industrial accidents and improving building safety. Full implementation of occupational safety (K3) can minimize the risk of work accidents. However, in reality, there are still many obstacles for companies and employees, and many accidents in the workplace are caused by unsafe behavior factors by the workers themselves. The methodology used in this study involves various approaches, such as literature review and primary data acquisition through questionnaires targeting respondents in construction project environments. The collected data will be analyzed using the Structural Equation Modeling method to identify important variables. Data processing was performed using the Smart-PLS version 4.1.0.1 application to determine the outer and inner models. Hypothesis testing was conducted using bootstrapping, considering the Original Sample values, T-statistics, and P-values. Based on the results, it is concluded that safety leadership has a significant indirect influence on improving safety performance. The strengthening of leadership aspects has the largest impact on improving safety culture, which then influences the improvement of construction safety performance, with an original sample (O) value of 0.273, a sample mean (M) of 0.277, a standard deviation (STDEV) of 0.177, a T-statistic value of 2.324, and a P-value of 0.001. Furthermore, effective safety evaluation (e.g., constructive and systematic evaluation) can help build a stronger safety culture, which in turn will improve overall safety performance. The implementation of innovation in construction processes or safety technology can also encourage better safety behavior among workers, which then contributes to improved safety performance.
Penerapan Sistem Manajemen Keselamatan dan Kesehatan Kerja (SMK3) pada Proyek Konstruksi Gedung di Kawasan Inti Pusat Pemerintahan Ibu Kota Negara (IKN) Laksono, Arvidya Esta; Priyambodo, Bambang; Naibaho, Pio Ranap Tua; Sembiring, Kristina
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.20136

Abstract

The implementation of the Occupational Safety and Health Management System (SMK3) in construction projects is an absolute necessity considering the high potential risk of work accidents. This study aims to evaluate the extent to which SMK3 is implemented in the construction project of the POLRI and BIN Flats (Rusun) in the Core Area of ​​the Government Center (KIPP) of the National Capital City (IKN). The research method used is a quantitative approach by distributing questionnaires to 106 respondents consisting of project managers, supervisors, and field workers. The results of the analysis show that the average level of SMK3 implementation is in the good category (mean = 4.06 on a scale of 5). The highest indicators are in the safety culture aspect and the role of the K3 manager. However, there are still challenges in the logistics and coordination aspects across jobs. This study recommends increasing the integration of safety technology and regular training for workers.
Analisis Stabilitas Tanggul Sungai Citonjong Kabupaten Pangandaran Ilham, Ilham
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.21146

Abstract

The Citonjong River, located within the Ciwulan-Cilaki Watershed (DAS) in West Java, frequently experiences flooding due to reduced catchment capacity, sedimentation, and embankment instability. This study analyzes the stability of the Citonjong River embankment at four design segments (TPT 2.5 m, 3.6 m, 4.5 m, and 5.0 m) using GEO5 2022 software. The analysis includes the stability of cantilever structures, pile capacity, slope stability, and lateral deformation under both static and seismic conditions, with low water levels and flooding. Geotechnical parameters were obtained from field investigations, while structural parameters adhere to the SNI 8460-2017 standards. The results indicate that all segments meet the minimum safety factors for overturning (1.5 static, 1.1 seismic), slope stability (1.5 static, 1.1 seismic), and vertical bearing capacity (2.5), with lateral deformation remaining below the 60 mm threshold. Recommendations include the installation of erosion protection, such as gabions or riprap, at river bends to enhance the passive resistance of the Continuous Concrete Sheet Piles (CCSP).

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