Jurnal Karajata Engineering

Studi Kinerja Silinder Berpori Dalam Mereduksi Genangan Terhadap Struktur Tanah Pada Saluran Drainase

2025-05-02T09:40:40+08:00

Flooding is often a problem on urban roads, especially during the rainy season. Floods are caused by a variety of things, including high rainfall, or inadequate drainage systems. especially in the Tamarunang Housing area in Gowa Regency where poor infrastructure and inadequate drainage systems can cause flooding and waterlogging. The purpose of this study is to conduct soil analysis on the influence of soil structure on the performance of porous cylinders, the influence of soil structure on the infiltration process, and to determine the infiltration discharge capacity of soil structure in drainage channels. The research was conducted in a residential area located in Gowa Asri, Tamarunang, Somba Opu District, Gowa Regency. With a total area of 6,661m2 located between 5°12'38'' South and 119°28'17'' E. This study uses a quantitative method, with the average permeability result produced per day is 3,119 mm³/day.

Evaluasi Desain Struktur Pondasi Pada Pembangunan Gedung Masjid Proyek Medan Islamic Center

2025-05-02T10:01:52+08:00

The foundation planning of a building structure must consider several things, including the condition of the project area, soil type, and the type of foundation to be used. The foundation is a substructure system used to channel the load of the upper structure to the soil and hard rock layers. This study aims to evaluate the bearing capacity and settlement of the foundation of the Medan Islamic Center Mosque Building. This study is a qualitative study, collecting soil data by conducting soil investigations at the project site to determine the level of soil density, soil layer structure, soil classification and soil parameters. Then by means of documentation of data collection from several sources related to foundation data which are then analyzed by modeling close to the actual conditions using PLAXIS V.8.6 software. The results of this study indicate that the depth of the foundation ranges from 20.50 to 46 m and long-term settlement is up to 12 cm, so that supervision of the upper structure is needed. To reduce settlement, the use of friction piles is proposed.

Efek Campuran Sedimen Embung Terhadap Karakteristik Bata Berbahan Dasar Pasir Batu Apung

2025-05-02T09:44:34+08:00

The Sofifi Reservoir aims to store water to provide raw water and utilize groundwater for the needs of the Sofifi community. Sediment deposition in the reservoir is due to community activities around the reservoir location and erosion on the slopes around the reservoir. Sediment that enters the reservoir bag will cause a decrease in the performance of the reservoir. In order to utilize the reservoir sediment, research was conducted using the sediment as raw material for making bricks. The research was carried out in the laboratory by making bricks using pumice sand and Sofifi reservoir sediment as raw materials. Variations of test objects with the composition of reservoir sediment and pumice sand 0%:100%, 20%:80%, 40%:60%, 60%:40%, 80%:20% and 100%:0% of the aggregate volume. Testing of visible properties, suitability of size, volume weight and compressive strength of bricks. The test results show that the quality of the bricks produced at a composition of 1:4 with a reservoir sediment content of 0% to 40% produces bricks of quality 100. A sediment content of 60% to 100% with a composition of 1:4 produces bricks of quality 50.

Perancangan Sistem Daur Ulang Air Limbah dengan Sewage Treatment Plant (STP) untuk Efisiensi Penggunaan Air di Gedung Koperasi

2025-05-02T09:38:26+08:00

Koperasi XX Building primarily used water supplied by the regional water company (PDAM) due to restriction on groundwater usage, specifically related to the Groundwater Utilization Permit (SIPA). In line with the commitment to improving water resource efficiency and supporting the Sustainable Development Goals (SDGs) of the UN and Indonesian government, the parent company has set a target to reduce water consumption by 30% by 2030. To address this, this study proposed a recycle sewage treatment plant (STP) system designed to meet water efficiency needs by using treated wastewater for non-potable uses, including toilet flushing, garden irrigation, and parking lot cleaning. This study included civil engineering analyses, such as pump selection and piping design, along with evaluations of water savings, Net Quality Income (NQI), and payback period. A Teral lifting pump (ASVM (N,G) 406-52.2) and 5 cm (2-inch) pipes are used, providing a flow rate of 150 m³/min. A 7 m³ upper tank is used for treated water storage. The project is estimated to cost Rp 582,552,846.10 and will require 39 days for implementation. It is expected to reduce PDAM water usage by 78%, leading to a 63% decrease in water bills. Despite a lengthy payback period of 21 years, this initiative offers significant environmental and sustainability benefits.

Eksperimentasi Peran Serat Alam Pada Tanah Lempung Dalam Upaya Peningkatan Infiltrasi Dan Plastisitas Tanah

2025-05-02T10:48:26+08:00

Clay soil consists of a type with limited load-bearing ability and low shear strength, thus it is essential to enhance the soil's stability, as this is influenced by the moisture level. The amount of water obtained by the soil depends on the soil's ability to absorb and channel the water received from the soil surface to the lower layers. Therefore, alternative materials are needed to improve the properties of the soil. This study aims to determine the effect of adding natural fibers on the infiltration and plasticity of clay soil. This research was a laboratory based testing, where infiltration testing was carried out using channel media and soil stability testing using the Atterbeg method. The addition of natural fibers to clay soil affects the infiltration discharge. The highest infiltration discharge is clay soil with the addition of rice husks and the lowest infiltration discharge is clay soil with a mixture of coconut fiber. Adding rice husks to clay soil can reduce the plastic index number which is 6%.

Analisis Kelayakan Finansial Pengembangan Gedung Dormitory Di Politeknik Astra

2025-05-02T10:51:35+08:00

The high demand for dormitories at Astra Polytechnic will keep rising in tandem with the growing student body. Investment for another tower building is required and also will have an impact on dormitory rental prices. The purpose of this study is to find out the evaluation of the feasibility of building a new dormitory building in terms of financial aspects and to calculate the appropriate dormitory room rental price for the dormitory building using a forecasting method. The research results show that the project is declared financially feasible because the IRR value is greater than the MARR, which is 7.8% > 6.875%, and the payback period is 19.38 years. The results were obtained with an adjusted rental price, where rental rates increase by 10% per year from the second to the fifth year. Following the development of the second dormitory tower in the sixth year, rental prices must increase by 20% annually until the end of the investment period in the 20^th year

Analisis Debit Andalan Sub DAS Pucak Untuk Berbagai Kebutuhan Di Kabupaten Maros

2025-05-02T10:55:39+08:00

The availability of water in the Pucak watershed is not always sufficient to meet all these needs simultaneously. This problem is exacerbated by climate change which causes changes in weather and erratic river flows. Climate uncertainty causes the weather to be unpredictable as it should be. This research aims to analyze the mainstay discharge of the Pucak Sub-watershed to ensure sustainable water availability. The analysis was carried out using daily discharge data for the last 10 years obtained from the nearest observation station. Data processing methods include the F.J Mock method and the Arithmetic method with certain reliability (Q80%, Q90% and Q99%). The research results show that the availability of water in the Pucak watershed for irrigation, raw water and hydroelectric power needs is met every month except in September. In the F.J Mock method the reliable Q80% discharge is 44.05 m³/sec, the Q90% discharge is 36.08 m³/sec and the Q99% discharge is 33.66 m³/sec. Meanwhile, the reliable Arithmetic method of Q80% discharge is 27.92 m³/second, Q90% discharge is 21.96 m³/second and Q99% discharge is 16.64 m³/second. These discharges are sufficient to meet various needs, but there is the potential for water shortages at the peak of the dry season

Analisis Debit Dengan Metode F.J. Mock Dan NRECA Serta Perbandingannya Terhadap Debit Pos Duga Air

2025-05-02T11:02:01+08:00

The Makawa river basin located in the Rongkong watershed has an increase in surface flow which affects the discharge flow which can cause flooding. Therefore, discharge data is needed to manage existing water resources. This study aims to analyze the water discharge using the F.J. Mock and NRECA methods, which are then compared to the water estimation post discharge. The results of this study showed that the F.J. Mock method has a relative error of 48% and a correlation coefficient of 0,690 with a strong interpretation, while NRECA showed a relative error of 50% and a correlation coefficient of 0,669 with a strong interpretation. Therefore, it is concluded that the F.J. Mock method is more appropriate than the NRECA method with lower relative error results, and a higher correlation coefficient than NRECA. The result of the simulation discharge between F.J. Mock, NRACA and water estimation post discharge are quite far apart.

Studi Perencanaan Bendung (Studi Kasus Bendung Kayuangin Kabupaten Majene Provinsi Sulawesi Barat)

2025-05-02T10:58:53+08:00

Water is a vital resource that supports various aspects of life, including domestic needs, agriculture, industry, and environmental conservation. The development of infrastructure such as dam plays a key role in maintaining the sustainability of water resources. So it is necessary to pay attention to hydrological analysis, lighthouse, and also stability of a weir. The aim of this research is to be able to understand and know how to plan weir by using existing technical data on weir designs as a guide and as a comparison parameter in this research. This research was carried out in Majene Regency, West Sulawesi Province during March to August 2024. The results of this research show that in general the hydraulic planning review for Kayuangin weir consists of a lighthouse height of 5 m, a weir width of 108 m, an effective width of the weir of 99,5 a deckzerk elevation of 26,59, a lighthouse elevation of 23,20, front floor elevation 17,95, and front floor length 20,60.

Implementasi Metode Statistical Quality Control (SQC) dalam Pengendalian Mutu Beton pada Proyek Konstruksi

2025-05-02T09:31:40+08:00

Concrete is widely used in the construction of buildings, bridges, and roads. The quality of concrete affects the stability and durability of the structure, so quality control in concrete production is very important. One of the methods that can be applied in concrete quality control is Statistical Quality Control (SQC). This study aims to test the quality of concrete through fine and coarse aggregate testing, specific gravity testing, water absorption, bulk specific gravity, sludge content, job mix test, and concrete bending strength test. The test results showed that the resulting concrete had a bending strength higher than the required standard, which was an average of 48.04 kg/m² which was greater than 45 kg/cm². These results show that the FS 45 concrete tested has quality that meets the criteria and can be applied to construction with good performance.