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Astonjadro
Published by Universitas Ibn Khaldun Bogor
ISSN : 23024240     EISSN : 26552086     DOI : http://dx.doi.org/10.32832/astonjadro
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Astonjadro: Jurnal Rekayasa Sipil adalah jurnal ilmiah dibidang teknik sipil p-ISSN : 2302-4240 dan e-ISSN : 2655-2086. Jurnal Rekayasa Sipil Astonjadro diterbitkan untuk mengapresiasi dan memberikan informasi ilmiah bagi peneliti, dosen serta para profesional. termasuk dalamnya pengembangan model dan konsep penelitian yang mengacu secara berkesinambungan. Jurnal Astonjadro diterbitkan oleh Fakultas Teknik dan Sains Universitas Ibn Khaldun Bogor, terbit dua kali dalam satu tahun yaitu bulan Juni dan Desember.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 507 Documents
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Analysis of Factors Causing Variation Orders and their Impact on Construction Contract Value of Main Dam Projects Siahaan, Hasiholan Christian; Wiguna, I Putu Artama
ASTONJADRO Vol. 13 No. 3 (2024): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v13i3.15981

Abstract

The Indonesian government has been actively engaged in extensive dam construction initiatives aimed at harnessing water resources for diverse purposes such as agricultural irrigation, clean water supply, flood control, power generation, and tourism. However, the construction of each main dam project faces challenges, particularly in the form of variation orders that lead to increases in construction costs. This research investigated the factors contributing to variation orders in main dam projects in Indonesia and to assess their impact on the overall construction costs. A comprehensive literature review was performed to identify variation order factors previously studied by researchers. Subsequently, secondary data were gathered through questionnaires administered to various stakeholders involved in main dam projects, including contractors, consultants, and owners. The analysis of questionnaire responses revealed a total of 26 indicators contributing to variation orders, which were categorized into 9 consultant-related factor, 8 owner-related factor, 6 external factor, and 3 contractor-related factor. Four indicators, including the alignment of tender drawings and field conditions, natural changes (weather/geology), changes in work items, and the complexity of dam design, were identified as having mean values greater than 4 on a 5-point Likert scale. This indicates strong consensus among respondents that these indicators significantly contribute to variation orders. A subsequent questionnaire aimed to evaluate the impact of these 26 variation order indicators on construction cost increases. The collected data from respondents was analyzed using multiple linear regression. The results revealed that the contractor-related factor had the most substantial impact on cost increases with a coefficient of 0.14, followed by the external factor at 0.067, and the owner-related factor at 0.04.
The Analysis of Lateral Deformation of Diaphragm Wall by Using 2-Dimensional Finite Element Method in Basement Construction of the BRI Tower Medan Putri, Vini Rizki Eka; Roesyanto, Roesyanto; Hasibuan, Gina Cynthia Raphita; Surbakti, Rudianto
ASTONJADRO Vol. 13 No. 3 (2024): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v13i3.16027

Abstract

Land availability for multi-storey buildings can be managed by constructing a multi-storey building with a basement. The basement construction of Menara BRI Medan is surrounded by office buildings. The soil is composed of sand, medium sand, clay silt, and gravel, resulting in the construction of a retaining wall comprised of a diaphragm wall 17,50 meters deep with a wall thickness of 0,60 meters. During the deep excavation work, the diaphragm wall was reinforced by temporary supports (strut). The strut installation consists of 2 layers with a distance of 3 meters in between struts. This minimizes the deformation that occurs. The lateral deformation was calculated using the finite element method in PLAXIS 2D with Mohr-Coulomb soil modeling at drill point BH-02. The deformation results in PLAXIS 2D will be compared with the on-site monitoring results by taking Inclinometer-I2 measurements. The result of the lateral deformation of the diaphragm wall from the analysis using PLAXIS 2D modeling was found to be 7,72 mm. In addition, the lateral deformation value from the monitoring results during the measurement of inclinometer-I2 on site was 7,55 mm. However, during the comparison between the deformation results in PLAXIS 2D and the monitoring results on site, discrepancies were identified due to alterations of parameters during the execution of the deep excavation work.
The Usage of Surface Distress Index (SDI) and Pavement Condition Index (PCI) to Evaluate The Condition of Jamin Ginting National Road (BTS. Medan City - BTS. Karo Regency) Brahmana, Ivana Christine Sembiring; Hasibuan, Gina Cynthia Raphita; Anas, Muhammad Ridwan
ASTONJADRO Vol. 13 No. 3 (2024): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v13i3.16028

Abstract

Considering the importance of national roads, it is necessary to conduct a review of maintenance strategies based on Minister of Public Works Regulation No. 13/PRT/M/2011 where road maintenance is a road handling activity, in the form of prevention, maintenance and repairs needed to maintain the condition of the road so that it continues to function optimally and serve the road so that the specified life plan can be achieved. The results of research carried out using the Pavement Condition Index (PCI) method for the Bts direction. Medan City – Bts. Regency. Karo is in "Good" condition and the strategy for maintenance is Routine Maintenance along 5.8 Km, Preventive Maintenance along 1.6 Km, Rehabilitation along 0.9 Km, Major Rehabilitation along 1.7 Km at IDR 5,278,395,170.
The Aggregate Gradation in Road Reconstruction Hakzah, Hakzah; Andriansyah, Andriansyah; Mustakim, Mustakim; Jasman, Jasman
ASTONJADRO Vol. 13 No. 3 (2024): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v13i3.16068

Abstract

Reconstruction of the road section uses the flexible pavement method where aggregate material is the main component of the structure. Choosing the right aggregate gradation and meeting the specification requirements will greatly determine the quality of the road. This research aims to determine the characteristics of aggregate gradation sourced from stock files and compare the results of aggregate gradation analysis of job mix design planning consultants. The method uses laboratory testing. Aggregate wear test results 2-3 = 5.36%, 1-2 = 6.14%. The absorption value of aggregate 2-3 = 0.87%, 1-2 = 1.79%, 0.5 - 1 = 1.80% and stone ash = 2.27%. Values of dry specific gravity, SSD specific gravity, and apparent specific gravity of aggregate 2-3 = 2.73, 2.69, 2.66, 1-2 = 2.72, 2.64, 2.62 0.5- 1 = 2.70, 2.62, 2.58, rock ash = 2, 53, 2.59, 2.69. These values meet the requirements of the 2018 Bina Marga specifications, 2nd revision. The comparison of the results of the field aggregate gradation test analysis with the results of the job mix design analysis is the same because the aggregates tested come from the same stock file. The results of the sieve analysis test showed that the coarse aggregate fineness modulus of 2-3, 1-2, and 0.5 - 1 did not meet the specification standards, while the fine aggregate for stone ash did. The value that does not meet is caused by not paying attention to the additional note that the coarse aggregate retained on the 1" sieve is ±6%.
Analysis of the Influence of Order Variation Factors on the Costs and Time of Implementing Channel Diversion Infrastructure Construction Projects in Residential Areas Hindami, Ghazi Ghossan; Suroso, Agus; Amin, Mawardi
ASTONJADRO Vol. 13 No. 3 (2024): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v13i3.16249

Abstract

Tangerang is one of the big cities that is developing in Indonesia. Along with the development of the city, one sector that is increasingly developing is the housing sector. In implementing construction projects, problems are often faced, one of which is the occurrence of changes. Almost all existing projects experience variation orders (VO). Variation orders always have cost and time implications. Whatever the variation, there will be risks to the work being done, both in terms of work delays and additional costs that must be borne. Research using the SEM PLS method was carried out to find out what factors cause variation orders and how they affect time and cost performance in channel diversion infrastructure projects in residential areas. Based on the results of responses from correspondents, the significant value that influences project performance is planning and design with indicators of errors in planning drawings. Based on the results of the cost performance analysis for the amount of costs resulting from variation orders on work, the total increase was IDR. 10.516.305.346 and for less work the total is IDR. 6.628.461.533 around 12.96% of the initial contract price and the results of the time performance analysis for the amount of time resulting from variation orders on the project work show that there was a time extension of 5 months or 125%.
Effect of Corrosion on Steel Strength (ST. 37) Sundari, Titin; Mutrofin, Akmam; Ramadhani, Rahma; Khiyana, A'izzatul; Yulianto, Totok; Nugroho, Meriana Wahyu
ASTONJADRO Vol. 13 No. 3 (2024): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v13i3.16577

Abstract

Rust on steel is often a problem in construction work. Rust occurs when iron oxidizes. The cause is prolonged exposure to water, air, or an acidic environment. Iron will bind oxygen atoms in the air to form iron oxide/rust. Rust continues to increase, accelerating the process of damage to buildings. Rust cannot be avoided, but it can control its rate. St.37 carbon steel is the most widely used material for various types of building construction. Therefore, it is necessary to carry out experimental tests regarding the rate of corrosion and its effect on the strength of steel. In this research, using St.37 steel plates, the corrosion process was carried out by leaving the specimens in an open space, immersing the specimens in sea water, and immersing the specimens in fresh water for 15 days. The aim of this research is to analyze the corrosion rate and its effect on the strength of St.37 carbon steel material. Based on the research results, the average corrosion rate of test plates in open spaces was 0 MPy with an extraordinary resistance category; soaked in sea water 14.76 MPy with good category; and soaked in fresh water 39.37 MPy with the fair category. Meanwhile, based on the tensile test results, the average strength was 560.8 MPa for objects, 510.4 MPa, and 492.8 MPa, respectively. This corrosion rate affects the strength of the steel, the greater the corrosion rate, the tensile strength of the steel plate decreases.
Marshall Characteristics, Refusal Density and Abrasion Value on Hot Rolled Asphalt (HRA) Mixtures Using Laterite Stone as Replacement Aggregate Syahairony, M.; Naibaho, Pio Ranap Tua
ASTONJADRO Vol. 13 No. 3 (2024): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v13i3.17555

Abstract

This research examines the mechanical performance and durability of various mixtures of laterite material and crushed stone used in asphalt mixes. The materials used included AC 60-70 asphalt from Pertamina, coarse aggregate from crushed stone from a local quarry, laterite stone from a quarry in Central Kalimantan, and fine aggregate from a local quarry. The Marshall tests provided data on stability, flow, density, Volume of Voids in Mineral Aggregate (VMA), Volume of Voids in Mix (VIM), Volume Filled with Asphalt (VFWA), and Marshall Quotient (MQ). The Marshall test on the 100% laterite mixture showed that set A11-A13 had good density with moderate VMA and VIM values, as well as high stability and MQ. The slightly high flow indicated moderate elasticity. Set A21-A23 showed an increase in density with higher VMA and lower VIM, which improved stability but reduced MQ, indicating greater elasticity. Set A31-A33 showed a significant increase in stability and VFWA with higher flow, indicating high elasticity while remaining strong against load. Set A41-A43 had higher density and VFWA, slightly reduced stability, and lower MQ, indicating greater elasticity. Set A51-A53 had the highest density with very low VIM and high VFWA, showing very good cohesion but low stability and high flow, indicating significant elasticity and vulnerability to deformation. In the 50% laterite and 50% crushed stone mixture, set A11-A13 showed good density with moderate VMA and VIM, high stability and MQ, although the high flow indicated moderate elasticity. Set A21-A23 had increased density with higher VMA and lower VIM, resulting in better stability under load but reduced MQ, indicating increased elasticity. Set A31-A33 had significant stability and high VFWA with higher flow, indicating high elasticity but strong resistance to load. Set A41-A43 showed high density and VFWA with slightly reduced stability and low MQ, indicating greater elasticity. Set A51-A53 had the highest density with very low VIM and high VFWA, showing excellent cohesion but low stability and high flow, indicating significant elasticity and vulnerability to deformation. In the 100% crushed stone mixture, density ranged from 2.216 gr/cc to 2.232 gr/cc, indicating a dense and compact mixture. VMA increased from 16.70% to 19.04%, indicating an increased capacity of the mixture to hold asphalt, while VIM decreased from 5.91% to 4.05%, indicating increased density of the asphalt mix. VFWA increased from 64.65% to 78.72%, indicating improved pore filling by asphalt contributing to the cohesion of the mix. Stability ranged from 1,148.8 kg to 1,329.8 kg, indicating the mixture's ability to withstand deformation and load pressure. Stability was fairly high (1,117.84 kg) but lower MQ (291.602 kg/mm) indicated lower resistance to deformation compared to RA1-RA3. Set RC1-RC3 had the same density as RB1-RB3 (2.233 gr/cc), but higher VMA (11.64%) and larger VIM (4.37%), and lower VFWA (62.590%), indicating less efficient pore filling. The lowest stability (887.36 kg) and the lowest MQ (242.191 kg/mm) indicated suboptimal mechanical performance and higher vulnerability to deformation. In the abrasion test using the Los Angeles machine, laterite stone showed an abrasion value of 27.2%, indicating good resistance to abrasion and impact, suitable for construction applications requiring aggregates with high resistance to mechanical wear. Crushed stone experienced a mass loss of 30.9% after the abrasion test, still within the upper limit acceptable for road construction, but this aggregate is more prone to degradation when exposed to heavy traffic loads or extreme weather conditions. Aggregates with high wear tend to be more brittle, which can lead to a decrease in the quality and longevity of roads or structures built.
Analysis of Road Damage Levels Using the SDI (Surface Distress Index) Method for Evaluation and Handling of Potholes Prayudyanto, Muhammad Nanang; Rulhendri, Rulhendri; Syaiful, Syaiful; Ramadan, Riki Natanael
ASTONJADRO Vol. 14 No. 1 (2025): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v14i1.15015

Abstract

Highways are land transportation infrastructure that is very important in facilitating economic relations activities. The method used is the SDI (Surface Distress Index) method. The purpose of this study is to identify the types of road damage, analyze the level of road damage using the SDI method and evaluate the SDI value and handling potholes. The length of the road studied in this research is 1000 ± m which is divided into 10 segments with a segment length of 100 m each. The data required for this research is secondary data and primary data. Based on the results of processed field data, 6 types of road damage were obtained. The percentage results on Jalan Ciremai Ujung with an average SDI value of 34 and categorized as having a value in good and moderate conditions so that the percent value (%) in damaged conditions is 90%, moderate 10%, slightly damaged 0% and seriously damaged 0%. And carry out handling by means of routine maintenance on segments 1,2,3,5,6,7,8,9,10 and periodic maintenance on segment 10.
Influence of Residential Area Movement on the Performance of Kranggan Cibubur Road Section Akbardin, Juang; Nurani, Intan Inti; Ma’soem, Dadang Mohamad
ASTONJADRO Vol. 14 No. 1 (2025): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v14i1.15723

Abstract

The population of Bekasi and Depok City continues to increase, so the need for housing will also increase. To fulfill the need for housing, settlements will continue to develop. With the continued development of settlements, the volume of surrounding traffic will also increase. When the increase in traffic volume is not balanced with an increase in the capacity of the road section, there will be long queues of vehicles and long travel times. The purpose of this study is to determine the generation of movements generated from settlements. The results of this study are the estimation of movement generation from Kranggan Permai housing with a linear regression equation model, namely multiple Y1 = -0.007 + 0.011X1 + 0.649X4 + 0.118X5 + 0.336X7 with a generation value of 512.94 and Cibubur housing with a regression equation model, namely Y2 = 0.929 + 0.530X4 + 0.388X6 + 0.423X7 with a generation value of 603.043 smp/hour.
Paid Parking Performance Evaluation at Depok Baru Station Syaiful, Syaiful; Murtejo, Tedy; Rulhendri, Rulhendri; Gunawan, Dede; Wardhani, Asri Kusuma; Lestari, Dini Hari Mulya
ASTONJADRO Vol. 14 No. 1 (2025): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v14i1.15729

Abstract

Depok Baru Station is a train operating facility that stops regularly to pick up and drop off passengers, Depok Baru Station is in the operational area of DAOP 1 Jakarta. Depok Baru Station has so many passengers that one of the motorized vehicle parking facilities cannot accommodate vehicles parked in the area at Depok Baru Station. Therefore, it is necessary to study parking analysis at Depok Baru Station to provide benefits for motorbike users who do not get parking space, this is to create comfort and security for passengers who park their motorbikes in the Depok Baru Station area. So that it can provide an alternative parking control at Depok Baru Station so that no more motorized vehicles are found that are not parked neatly. This study aims to obtain the existing capacity of parking locations at Depok Baru Station and to obtain parking characteristics (accumulation, duration of each vehicle, parking space turnover rate and parking index) of motorized vehicles in the Depok Baru Station area. This study uses quantitative methods, data collection is carried out by means of observation as primary data, including data on the number of incoming vehicles, data on the number of outgoing vehicles, data representing peak hours, peak days, normal hours, normal days, number of Parking Space Units (SRP) . The results of this study are that the existing parking lot obtained secondary data using the survey method to produce existing data on an area of 840m2 motorcycle parking area with a capacity of 300 SRP (parking space units) and a slope angle of 90° at Depok Baru Station. the largest accumulation stasis was 358 vehicles with an average parking duration of 12.20 hours on Tuesday 13 June 2023. During the eight days of the survey, the maximum parking volume was 480 vehicles with a maximum accumulated vehicle parking of 424 vehicles which occurred on Monday June 12, 2023, the highest turn over for motorcycle parking at Depok Baru Station reached 161.00%, therefore the performance of motorcycle parking is quite high. The capacity of motorcycle parking spaces at Depok Baru Station cannot accommodate the available parking space requirements. This can be reviewed by looking at the parking index which exceeds 100%.

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