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REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development
Published by Universitas Tadulako
ISSN : 27233472     EISSN : 27461033     DOI : https://doi.org/10.22487/renstra
Core Subject : Science, Social, Engineering,
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development is a peer-reviewed journal published by the Civil Engineering Department, Engineering Faculty, Tadulako University. The journal is to publish research articles or original literature reviews covering all concentrations in the fields of Civil and Applied Engineering including Structural Engineering, Geotechnical Engineering, Water Resources Management, and Engineering, Transportation Engineering and Management, Construction Project Management, and other applied sciences related to the engineering field. Articles submitted for publication in the journal must have never been published by other media or journals and are free from plagiarism. It is a six-monthly journal, open-access and published in collaboration with the Indonesian Society for Geotechnical Engineering, Regional Commissariat of Central Sulawesi, and Indonesia Transportation Society, Central Sulawesi.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 106 Documents
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Kuat Lentur Balok Laminasi Kombinasi Kayu Jawa (Lannea Coromandelica) dan Gelugu (Cocos nucifera) Chauf, K.A.; Nurdin, S.; Dolu, A.; Armabelio, A.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 5 Issue 2 (September 2024)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v5i2.670

Abstract

The use of kayu Jawa (Lannea coromandelica) and gelugu (Cocos nucifera) is very necessary to reduce the forests exploitation as a source of wood raw materials. However, both have debility in terms of mechanical properties and maximum dimensional achievement. Therefore, a mixed glulam system can be applied to produce lightweight structural timber beams with adequate performance. This research is aimed at determining the flexural strength, stiffness, ductility and failure of mixed glulam beams combined with kayu Jawa and Gelugu. A series of bending tests were carried out on timber beams using the three point bending method on three categories of beams, namely B-J, B-G and B-L. B-J beams, consist of solid timber of kayu jawa which has density ± 0,60 gr/cm3, B-K consist of solid gelugu which has density ± 0.88 gr/cm3, while B-L consists of kayu jawa timber in the core zone and one layer of 10 mm thick gelugu with a density of 0,88 gr/cm3 on the tension zone. Each beams category consists of five replications with the dimensions of each beam being 50 mm of wide, 55 mm of high and 760 mm of span. Laminated beams (B-L) are glued with emulsion adhesive with Viscosity 2,500 – 4,500 cPS, resin content 90 – 91%, gel time: 1 hour and curing time 5 – 6 hours with two-sided coating of 250 gr/m2 and clamping force 2 MPa. The results of this research show that the flexural strength (fb) and stiffness (EI) of mixed glue laminated laminated beams are 1,3 times higher than B-J. Apart from that, mixed glue laminated laminated beams (B-L) there was an increase the ductility of 47% when compared to B-G.
Analisis Investasi Jasa Penyewaan Perancah (Scaffolding) di Kota Palu Nirmalawati, N.; Dolu, A.; Fadliah, I.; Alit, D.W.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 5 Issue 2 (September 2024)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v5i2.672

Abstract

Scaffolding is an auxiliary construction used in multi-storey building construction work, used so that the implementation of work in the field can be easier and faster. As the development of building construction in the city of Palu, the need for the use of scaffolding is increasing. So it is interesting for researchers to find out whether investors in the field of scaffolding rental are still feasible for the coming years to move in this rental sector. The literature study method uses investment feasibility calculations, secondary data is taken from existing data in the field, namely the number of building construction works in Palu city, company financial cash flow data, and uses NPV (Net Present Value), EAV (Equivalent Annual Value), IRR (Internal Rate of Return) , and DPP (Discounted Payback Period). Assume income from the number of rentals and rental prices for the next 20 years. Interest rate of 8% and inflation of 3.85% for a period of 20 years at the PT Lexindo Scaffolding company obtained an NPV value of Rp.2,168,897,376 > 0, an EAV value of Rp.197,646,803 > 0, an IRR value of 33% > 8%, and DPP value of 4.98 years <20 years, for PT. Jaya Scaffolding obtained an NPV value of Rp.6,995,506,453 > 0, an EAV value of Rp.755,554,338 > 0, an IRR value of 30% > 8%, and a DPP value of 5.51 years <20 years. The conclusion states that the investment in scaffolding rental services is still feasible to invest.
Sebaran Salinitas dan Temperatur Secara Horzontal di Muara Sungai Palu Sucipto, A.; Thaha, M.A.; Hatta, M.P.; Mahmuddin, F.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 5 Issue 2 (September 2024)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v5i2.673

Abstract

Salinity and temperature are easily measured oceanographic factors that play an important role in physical, chemical and biological processes in the ocean. Therefore, information on the distribution of temperature and salinity is very important. Palu River is the main channel that has an important function in flowing the discharge that empties into Palu Bay. The coastal waters around the mouth of Palu River is a potential area for social and economic development of the surrounding community. Dependence on so many important commercial fisheries in the estuarine waters is one of the main economic reasons for conserving this habitat. Based on this, this study was conducted with the aim of determining the distribution of salinity and temperature in the Palu River estuary. Data were collected at 11 observation stations from October 24, 2022 to October 26, 2022, horizontally. The methods used were theoretical approaches and field observations. Data processing used ArcGis 10.8 software and ODV (Ocean Data View) 4.0. The research results from the distribution of salinity at 11 observation stations horizontally ranged from 3.63 to 36.10 ppt, while the temperature ranged from 26.30 °C to 29.30 °C. Salinity and temperature values varied at each depth. It appears that the tides and the flow of river water affect the distribution of salinity and temperature.
Karakteristik Ultrasonic Pulse Velocity Pada Perkerasan Jalan dengan Menggunakan Filler Bata Tahan Api Syukuriah, S.; Hustim, M.; Tjaronge, M.W.; Irmawaty, R.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 5 Issue 2 (September 2024)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v5i2.674

Abstract

Most road pavements in Indonesia use asphalt concrete mixtures. The choice of asphalt concrete is motivated by the fact that the mixture produces a waterproof and durable layer. However, this mixture has weaknesses related to tropical weather conditions. So the mixture is prone to damage, such as potholes and wavy roads. Coupled with heavy transportation equipment passing over the road construction. The development of technology in the field of construction is increasing, one of which is the increasing variety of technology to facilitate road construction work. This research uses the Portable Ultrasonic Nondestructive Digital Indicating Tester (PUNDIT) tool to perform a density analysis process based on the propagation speed of UPV, and this method has been widely used in Indonesia. Ultrasonic Pulse Velocity (UPV) is a tool used to determine material density. This study aims to determine the average ultrasonic wave propagation velocity in pavements before and after soaking using magnesia/converter type refractory brick filler material. This research was conducted at the Structures and Materials Laboratory, Faculty of Engineering, Hasanuddin University. Variations of 5%, 5.5%, 6% asphalt content using AC 60/70 asphalt mixture. Based on this research obtained before soaking: a. The average wave propagation speed of 5%, 5.5%, 6% asphalt content is 3279 m/s, 3473 m/s, 4001 m/s respectively. b The optimal average ultrasonic wave propagation speed value is found at 6% asphalt content, namely 4001 m/s. After soaking: a. The average wave propagation speed of 5%, 5.5%, 6% asphalt content is 3652 m/s, 3667 m/s, 3878 m/s, respectively. b The optimal average ultrasonic wave propagation speed value is found at 6% asphalt content, namely 3878 m/s.
Pengaruh Kadar Aspal dan Kepadatan pada Nilai Kekesatan (Skid Resistance) Permukaan Perkerasan Beton Aspal Lapis Aus Mashuri, M.; Syahbani, D.; Labaso, E.R.; Rahman, R.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 5 Issue 2 (September 2024)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v5i2.677

Abstract

Asphalt concrete wearing course is located on the topmost surface layer so that this layer is indirect contact with vehicle wheels and other environmental factors, such as sunlight, rainwater. This condition makes asphalt concrete wearing course pavement susceptible to wear on the surface layer. This condition causes wear on the surface of the asphalt concrete wearing course pavement, so that the surface becomes slippery because the skid resistance decreases, especially in wet conditions. The large asphalt content and density of the mixture can affect the skid resistance of the asphalt concrete wearing course surface. The purpose of this study was to determine the effect of bitumen content and density on the skid resistance value of the asphalt concrete wearing course surface. This research was conducted at the Transportation and Highway Laboratory, Tadulako University. This study used five variations of asphalt content, namely 5.0%, 5.5%, 6.0%, 6.5% and 7.0% by weight of the mixture. Measurement of the skid resistance value of the asphalt concrete wearing course pavement surface using the British Pendulum Tester (BPT). The measurement procedure is based on SNI 4427: 2008. One-way ANOVA Method with a significance level of 95% is used to determine the effect of asphalt content and density on the surface skid resistance value of asphalt concrete wearing course pavement. The results of this study found that asphalt content and pavement density had affected the skid resistance value of the asphalt concrete wearing course pavement surface. The results of this study have also found that the relationship model between asphalt content and the skid resistance value of the asphalt concrete wearing course pavement surface is y= -2.8543x +87.965, R2= 0.8279. The relationship model between density and the surface skid resistance value of the asphalt concrete wearing course pavement, y = -85.006x + 2621.46, R2 = 0.935. This means that the higher the asphalt content and the density of the asphalt concrete wearing course pavement, the lower the surface skid resistance.
Evaluasi Dimensi Tiang Pancang Dermaga di Daerah Pesisir Kabupaten Kolaka dengan Mempertimbangkan Pengaruh Likuifaksi Minmahddun, A.; Mangidi, U.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 5 Issue 2 (September 2024)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v5i2.686

Abstract

The pier in the coastal area of Kolaka Regency plays a crucial role in the distribution of goods and economic enhancement. However, the risk of liquefaction due to earthquakes threatens the stability and safety of the pier structure. This study aims to evaluate the dimensions of the pier piles considering the effects of liquefaction. The research methodology includes the analysis of liquefaction potential using the NCEER method, axial load capacity analysis using the Briaud method, and deflection analysis using the Broms method. Foundation analysis under liquefaction conditions is simplified by assuming the SPT values in the liquefied soil layer to be zero. Standard Penetration Test (SPT) data were used to assess soil conditions at the pier location. The analysis results indicate that the sand layer at a depth of 6-12 meters has a high potential for liquefaction, primarily due to the high content of coarse grains and a fine particle percentage of 15%. The increase in peak ground acceleration (PGA) in the Sulawesi region also amplifies the potential for liquefaction. The foundation analysis without considering liquefaction shows that the pile dimensions with a depth of 25 meters meet the design criteria, although deflection approaches the permissible limit. However, under liquefaction conditions, there is a slight reduction in axial load capacity (3%), but the pile deflection increases beyond the allowable limit. To mitigate the risk of liquefaction and ensure the safety of the pier, it is recommended to extend the pile depth to 28 meters.
Analisis Penjadwalan Waktu Pekerjaan Pada Proyek Jalan Kawasan Ekonomi Khusus (KEK) Pantoloan Menggunakan Linear Scheduling Method (LSM) Asnudin, A.; Ramlan, R.; Ganiya, P.A.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 6 Issue 1 (March 2025)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v6i1.683

Abstract

A construction project is a temporary activity with a specific end goal. One of the crucial things in the construction process is work scheduling, this is because it can affect the duration and cost of the project. In the context of scheduling, methods such as Block Charts, S-Curves, Network Diagrams, and Balance Line Diagrams/Linear Scheduling Method (LSM) has been around for a long time, but in its application the scheduling method should be adjusted to the characteristics of the project to avoid losses in development. The LSM method is considered appropriate for work that is repetitive in nature. This research aims at analyzing time scheduling for road projects in the Pantoloan Special Economic Area (SEA), Central Sulawesi, using Linear Scheduling Method (LSM). The purpose of this research is to determine the comparison of scheduling and budget plans between the LSM and project methods existing. Data collection consisting of primary data and secondary data was obtained by direct observation in the field and interviews with related parties. Then a scheduling analysis is carried out with assistance software. From the research results on the scheduling of the Pantoloan KEK Road Section Handling Project in Palu City using the LSM method, the completion time was 47 days. Meanwhile, in the initial planning, a completion time of 60 days was required, so there was a difference of 13 days. The project budget plan using the LSM method obtained IDR 2.321.225.151,01. Meanwhile, the initial project budget plan is Rp. 2,365,900,000.00 so there is a cost difference of Rp. 44.674.849.- By looking at the comparison of time effectiveness, scheduling using the LSM method is more effective and efficient.
Analisis Potensi Likuefaksi Dengan Alat Swedish Weight Sounding di Desa Tompe Kecamatan Sirenja Kabupaten Donggala Setiawan, H.; Sutrisno, M.; Hasanah, Y.; Rizal, A.; Kurniawan, A.; Qhalbi, A.N.; Gayatri, S.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 6 Issue 1 (March 2025)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v6i1.693

Abstract

In 2018 in Indonesia there has been an earthquake of 7.4 on the richter scale. The epicenter was on land around Sirenja district, Donggala regency, Central Sulawesi. The impact in some areas there is liquefaction of these areas, namely Petobo village and Balaroa village and also subsidence in Tompe Village this study aims to determine whether the soil in segment II of Tompe village has the potential for liquefaction based on the results of Cyclic Stress Ratio (CSR) & Cyclic Resistance Ratio (CRR) analysis and based on the results of Tsuchida grain distribution graph. Samples in this study amounted to 10 points by field testing using Swedish weight sounding tool to obtain the value of Nsw (n/m) correlated to the N-SPT data and analyzed by the CSR & CRR equation to obtain the value of the safety factor (FS). The results obtained with the range of FS values are for the potential 0.13 – 0.98 and not potential 1.06 – 1.72 and based on the results of grading the grain to get the value for the potential 70.31% - 95.87% and not the potential 0.39% - 6.62%  from the results of the 2 methods it is concluded that Tompe village based on the value of  FS 50% has the potential for liquefaction and based on the Tsuchida graph 85.78% has the potential for liquefaction.
Perbandingan Biaya dan Waktu Erection PCI Girder dengan Crawler Crane dan Gantry Launcher (Studi Kasus: Jembatan Soran Proyek Jalan Tol Solo – Yogyakarta – Nyia Kulon Progo Seksi 1 Paket 1.2) Suci, R.A.; Wibawa, S.A.; Firdausi, A.A.; Safarizki, H.A.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 6 Issue 1 (March 2025)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v6i1.698

Abstract

The infrastructure growth in Indonesia, particularly on the island of Java, has surged significantly up to the year 2024, one of which includes the Trans-Java toll road project. The aim of this development is to boost the country's economic growth and streamline transportation. A part of the Trans-Java toll road project that is still under construction is the Solo – Yogyakarta – NYIA Kulon Progo Toll Road Project, which connects the cities of Surakarta and Yogyakarta. The construction of the Solo – Yogyakarta – NYIA Kulon Progo Toll Road in Section 1 Package 1.2 is planned to traverse several terrains. For instance, at STA 22 + 767, it will cross the Soran River. Therefore, a bridge needs to be built at STA 22 + 767. The planning of the PCI girder erection method needs to be reviewed, especially for the Soran Bridge, as the initial plan to use the gantry launcher method requires further assessment in terms of time and implementation costs. Hence, an alternative method, the crawler crane, is needed for comparison. From the analysis of time and cost comparisons between the two methods, namely the Crawler Crane method and the Gantry Launcher method for the erection of the PCI girder at the Soran Bridge, the analysis results are as follows: The productivity of equipment using the Crawler Crane method is 0.75 units/hour, and for the Gantry Launcher method, it is 0.19 units/hour, making the productivity faster with the Crawler Crane method. In terms of implementation time based on the analysis, it is 9 days for the Crawler Crane method and 20 days for the Gantry Launcher method, making the implementation 55 percent faster using the Crawler Crane method. Regarding the implementation cost of each method based on the cost analysis, including the procurement and installation of PCI girders, it is IDR 9,219,795,750.00 for the Crawler Crane method and IDR 9,967,224,600.00 for the Gantry Launcher method, making the Crawler Crane method more cost-efficient by 7.49 percent.
Analisis Debit Air Limpasan Permukaan Akibar Perubahan Tata Guna Lahan Pada Daerah Aliran Sungai Bangga Andiesse, V.W.; Sutapa, I.W.; Tunas, I.G.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 6 Issue 1 (March 2025)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v6i1.700

Abstract

Surface runoff is rainwater that cannot be retained by soil, vegetation or basins and eventually flows directly into rivers or the sea. The amount of surface runoff determines the amount of damage caused by erosion and flooding. The amount of surface flow is influenced by rainfall, vegetation (land cover), the presence of water storage buildings and other factors. Damage to watersheds can cause various disasters, namely floods, droughts and landslides. The Bangga watershed has an area of 61,0561 km2 and has a river length of 20.7 km. Das Bangga has also experienced flash floods and mudflows in 2019 which caused 500 houses to be flooded and residents died after being washed away by the flood. The purpose of the study was to calculate runoff in the Bangga River watershed using the SCS-CN method. In this study the data used is secondary data, namely Rainfall data taken from the Upper Bangga and Lower Bangga stations and Land Use Maps and Soil Type Maps.  The period of secondary data used in 2018-2021. Land use and soil types are analyzed from land use maps and soil type data obtained. Map analysis was carried out using ArcGIS Software by making an overlay between the land cover map and the soil type map.  The second result of this analysis is the area of each type of land use and soil type hydrology group and its distribution in the Bangga watershed.  Based on the results of the analysis, the runoff using the SCS method obtained the maximum result in 2019 of 29,222 mm with a runoff volume of  1.784.155,751 m3, and the minimum runoff in 2018 of 0,072 mm with a runoff volume of 4.375,573085 m3. The occurrence of Land Use changes, climate change and human treatment of the environment can affect runoff.

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