Jurnal Karajata Engineering

Evaluasi Daya Dukung Fondasi Tiang Menggunakan PDA dan CAPWAP pada Gardu Induk

2026-08-04T19:19:12+08:00

Extra-high voltage substations require reliable pile foundations to ensure structural stability and safety. One method of evaluating the bearing capacity of pile foundations in the field is dynamic testing using a Pile Driving Analyzer or PDA combined with CAPWAP analysis. This study aims to evaluate the bearing capacity of pile foundations at extra-high voltage substations based on PDA test results and compare them with analytical calculations using the Meyerhof method. The testing was conducted on two installed pile foundations using the high strain dynamic testing method in accordance with the ASTM D4945 standard. Field data was obtained from measurements of force and velocity during hammering, then analyzed using CAPWAP software to determine the characteristics of tip resistance and skin friction. The analysis results showed that the ultimate bearing capacity based on the Meyerhof method was 1884.96 kN, while the CAPWAP analysis results showed a lower end bearing capacity, namely 167.3 kN for pole P-1 and 11.6 kN for pole P-2. This significant difference indicates that the dynamic test results are greatly influenced by soil conditions and soil-pile interaction in the field. This finding emphasizes the importance of using dynamic tests as a field evaluation to verify analytical calculation results in pile foundation design.

Analisis Kerusakan Finishing Dinding Bangunan pada Lingkungan Lembap

2026-08-05T12:53:52+08:00

The finishing of walls significantly influences the visual appeal and longevity of the building structures especially in high-humidity regions. Moisture accumulation, poor material choice and improper construction practices can accelerate deterioration, leading to mold growth, discoloration, and paint peeling. This study aimed to identify the causes wall finishing damage and to determine the most effective both repair methods for enhancing durability in humid conditions. This study used a case study methodology involving the direct observation of residential building exhibiting wall damage. The findings reveal that high humidity and improper moisture transport within the wall material, is the main cause of wall damage, leading to mold development and weakening of the plaster layer, which in turn causes paint to peel. A comparison of the repair methods indicated that a denser mortar mix with a ratio of 1:1, combined with a waterproof primer and finishing paint, proved more optimal, effectively mitigating moisture effects and preventing recurring damage. To conclude, effective wall repair requires proper substrate preparation, suitable material selection, and moisture management. These insights offer practical advice for enhancing the wall finishing performance in humid areas.

Studi Karakteristik Beton Porous Dengan Menggunakan Agregat Sungai Maulu

2026-08-05T12:52:08+08:00

Local aggregate management in a region must be optimized by considering the need for materials that provide sustainable green solutions. Materials sourced from the Maulu River have not been widely explored scientifically and optimally utilized in concrete technology. This research offers novelty through the use of local aggregates originating from the Maulu River as a constituent material for porous concrete and an analysis of the relationship between aggregate characteristics and the physical and mechanical properties of concrete, including pore volume, permeability, and compressive strength. By setting the aggregate dimension number 8, which is in the range of 2.38 mm to 9.5 mm. This study aims to identify the characteristics of porous concrete based on the constituent materials from the Maulu River in Tana Toraja Regency. The duration of the research, which took place from October to December 2024, by applying the ACI 522R-10 porous concrete mix planning, as well as analyzing the characteristics of porous concrete such as pore volume, permeability, and compressive strength. The results of the study showed that the average void ratio was 18.453%, the average permeability was 5.964 mm/second and the average compressive strength at the ages of 7, 21, and 28 days was 6.04 MPa, 7.30 MPa, and 8.32 MPa. By referring to the qualified characteristics, the results of this study are expected to provide a sustainable green connectivity solution for the people of the Sungai Maulu area.

Evaluasi Kondisi Perkerasan Jalan Bundaran Waru Menggunakan Metode PCI, SDI, dan Roadroid Berbasis Smartphone

2026-08-05T13:14:32+08:00

Evaluating road damage using Pavement Condition Index, Surface Distress Index, and International Roughness Index methods is generally difficult to implement in roundabout areas due to high traffic volumes and surveyor safety risks. Limited access to such congested road sections often hinders the accuracy and efficiency of conventional pavement condition data collection. Therefore, this study utilizes a digital road distress assessment application as an alternative solution that is safer, more efficient, and accurate without disrupting the existing traffic flow. A quantitative research method was employed to compare the standard evaluation results of PCI and SDI methods against the digital application-based method, which generates IRI values. Data collection focused on high-volume roundabout sections through field surveys and data analysis. The results indicate that loose aggregate and patching were identified as the most dominant distress types in the roundabout area. A locally significant condition was detected, particularly in the STA 0+300 to 0+400 segment, which exhibited poor values. In this specific segment, the structural evaluation yielded an SDI value of 115, while the PCI score dropped to 47, indicating a fair condition. This decline in functional performance aligns with the Roadroid application records, which showed a sharp increase in the IRI value, reaching 9.02. Based on the analysis of these various assessment methods, specific road maintenance recommendations per segment, such as routine or periodic maintenance, are provided.

Evaluasi Sifat Mekanis Beton Menggunakan Agregat Kasar Batu Andesit Toraja Utara

2026-08-05T12:31:26+08:00

The increasing demand for concrete has intensified the exploitation of natural coarse aggregates, while large quantities of andesite waste generated from stone-carving activities in North Toraja remain underutilized. This study investigates the feasibility of using locally sourced andesite waste as a 100% replacement for conventional coarse aggregate in normal-strength concrete. Concrete specimens with a target compressive strength of 20 MPa were prepared and tested for workability, compressive strength at 3, 7, 14, and 28 days, and splitting tensile strength at 28 days. Experimental results showed that the andesite aggregate satisfied all standard requirements for coarse aggregates. The concrete containing andesite aggregate achieved a 28-day compressive strength of 18.02 MPa and a splitting tensile strength of 2.93 MPa, compared with 19.82 MPa and 3.16 MPa for the control concrete, representing reductions of approximately 9.1% and 7.3%, respectively. Despite these reductions, the concrete remained within the range of normal-strength structural concrete. The findings demonstrate that waste andesite from local stone-processing activities can be utilized as an alternative coarse aggregate, contributing to sustainable construction practices and reducing dependence on natural aggregate resources.