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wahyu kartini
Universitas Pembangunan Nasional Veteran Jawa Timur
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Transportation Other

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Implementasi dan Analisis Kinerja PJU Tenaga Surya untuk Peningkatan Kualitas Pencahayaan di Kawasan Technopark UPN “Veteran” Jawa Timur Sumaidi; Wahyu Kartini; Anna Rumintang Nauli
Jurnal Sains Teknologi dalam Pemberdayaan Masyarakat Vol. 7 No. 1 (2026): Juli 2026
Publisher : Fakultas Teknik Universitas Bhayangkara Jakarta Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31599/75vnea30

Abstract

Poor lighting at the Technopark access of UPN "Veteran" Jawa Timur creates security risks and energy inefficiency. This study aims to implement an energy-independent Solar Street Light (PJU-TS) system to support the Green Campus vision. Using applied research methods, the activities included needs analysis, system design, physical installation of four All-in-One PJU-TS units, and performance evaluation. Post-installation results showed a drastic increase in average light intensity from <1 Lux to >10 Lux, meeting SNI 7391:2008 standards. The light sensor-based automatic control system proved effective in managing dusk-to-dawn operations, optimizing LiFePO4 battery usage. This implementation successfully eliminated blind spots, significantly improved the academic community's sense of security, and serves as a model for eco-friendly and energy-efficient campus infrastructure. 
Comparison of the Siesmic Performance of the Patra Hotel Building in Surabaya with a Dilatation System Using Pushover Analysis Achmad Fadli Erlangga; Wahyu Kartini; Sumaidi Sumaidi
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 1 (2026)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v10i1.991

Abstract

The Patra Hotel Surabaya features an irregular L-shaped plan, making it highly susceptible to torsional irregularities in the seismically active region of Surabaya. This study aims to design an expansion joint (dilatation) system, determine the location of structural separation, select appropriate joint materials, and analyze the seismic performance of the structure in both conditions: without and with dilatation. The model without dilatation treats the original L-shaped building as a single structure. In contrast, the dilatation model separates it into two blocks: Model 1 represents the first block and Model 2 the second. The seismic response was evaluated using a performance-oriented design method that employed pushover analysis in accordance with ATC-40 and SNI 1726:2019. The findings indicate that Model 1 experiences a peak displacement of 88.209 mm in the X-axis and 73.431 mm in the Y-axis, while Model 2 reaches a maximum displacement of 71.841 mm in the X-axis and 85.047 mm in the Y-axis. Based on these results, the required expansion joint gap (?mt) is 150 mm. The expansion joint uses aluminium material with a movement capacity of ±75 mm for thermal effects and ±150 mm for seismic effects, exhibiting flexible, elastic behaviour. The pushover analysis results demonstrate that both Model 1 and Model 2 reached the Immediate Occupancy performance, with ductility figures of 9.89 for the X-axis and 7.65 for the Y-axis for Model 1, and 9.59 for the X-axis and 7.94 for the Y-axis for Model 2. A comparison of their seismic performance reveals that the model lacking dilation exhibited a greater maximum deviation, measuring 173.404 mm in the X-axis and 145.164 mm in the Y-axis. In comparison, Model 1 has 172.933 mm (X) and 141.229 mm (Y), while Model 2 has 137.923 mm (X) and 165.639 mm (Y). The drift ratio of the model without dilatation is also higher, at 1.149 (X) and 1.116 (Y), compared to Model 1 (1.087 (X) and 1.073 (Y)) and Model 2 (1.020 (X) and 1.104 (Y). Furthermore, the column reinforcement requirements in the model without dilatation are greater (K1 32D22, K2 28D22, K3 24D22) compared to the dilatation system (K1 28D22, K2 24D22, K3 20D22). Therefore, the implementation of a dilatation system is proven to improve seismic performance by reducing maximum displacement and drift ratio, while also resulting in a safer and more economical structural design. Contribution to Sustainable Development Goals (SDGs):SDG 4: Quality Education; SDG 9: Industry, Innovation and InfrastructureSDG 11: Sustainable Cities and Communities
The Efficacy of Type F Fly Ash from Paiton Power Plant on the Compressive Strength of Concrete Thesalonika Octaviana Wahyudi; Wahyu Kartini; Nia Dwi Puspitasari
UKaRsT Vol. 9 No. 2 (2025): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v9i2.6650

Abstract

Portland cement is the primary binder in concrete and plays a crucial role in defining its structural performance. However, its production contributes approximately 7% of global carbon dioxide emissions, necessitating sustainable alternative materials. One potential material is Type F fly ash derived from coal combustion waste in steam power plants. This study aims to evaluate the effectiveness of Type F fly ash from the Paiton Power Plant as a sustainable cement replacement material in concrete based on compressive strength performance. Fly ash was activated using an alkaline solution consisting of NaOH and Na₂SiO₃ with a ratio of 1:2.5, where the NaOH concentration was maintained at 10 M. Two water–cement ratios (W/C) of 0.45 and 0.55 were employed to investigate their influence on workability and compressive strength. Cylindrical specimens were tested at 28 days with fly ash replacement levels of 0%, 80%, 90%, and 100% by weight of cement. The results indicate that increasing fly ash content significantly enhances compressive strength. The optimal performance was achieved with 100% fly ash replacement, yielding a compressive strength of 48.48 MPa or an increase of 102.4% compared to conventional concrete. This performance is attributed to the high silica content of Type F fly ash, which promotes the formation of dense N-A-S-H gel through alkaline activation, resulting in a more compact and less porous microstructure. These findings demonstrate that Type F fly ash from the Paiton Power Plant can effectively function as a primary binder, offering a sustainable alternative for high-performance concrete production.
Co-Authors Achmad Dzulfiqar Alfiansyah Achmad Fadli Erlangga Adam Rachmat Edijana Afif Kusuma Wardana Anna Rumintang Astawa, Made Dharma Astawa, Made Dharma Eliza Siti Syarifah Gita Amanda Yulianti Hendra Setiawan Hilmi, Muhammad Agus Larasati, Andra Putri Made Dharma Astawa Mahendrayu, Betania Mochamad Ilham Zulfar Nanda Primarta Nadila Nia Dwi Puspitasari Nia Dwi Puspitasari Putri Shinta Permatasari Ramayati, Novita Dwi Rida Pribady Rida Pribady RIVI FATHURRACHMAN AZIS Safriana Wahdi, Yudha Sumaidi Sumaidi Sumaidi Sumaidi Sumaidi Sumaidi Sumaidi Sumaidi, Sumaidi Thesalonika Octaviana Wahyudi