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All Journal RACIC : Rab Construction Research Jurnal Kridatama Sains dan Teknologi Kelimutu Journal of Community Service
Bara, Alvin Alfredo
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Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Social Sciences Other

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Systematic Literature Review: Peranan Fly ash, Silika, dan Slag Sebagai Bahan Tambahan dalam Meningkatkan Kekuatan Tekan Dini Beton Bara, Alvin Alfredo
Jurnal Kridatama Sains dan Teknologi Vol 7 No 01 (2025): Jurnal Kridatama Sains dan Teknologi
Publisher : Universitas Ma'arif Nahdlatul Ulama Kebumen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53863/kst.v7i01.1729

Abstract

This study aims to systematically evaluate the role of mineral admixtures—Fly ash, silica (silica fume and nano-silica), and Slag (GGBFS)—in enhancing the early compressive strength of concrete within 1 to 7 days of curing. To achieve this objective, a Systematic Literature Review (SLR) was conducted by analyzing seven selected international research articles published between 2023 and 2025. The review focused on admixture types, mix proportions, particle sizes, types of activators, curing methods, and early-age compressive strength results. The findings reveal that while Fly ash is an environmentally friendly pozzolanic material, it exhibits low early reactivity and requires activation or combination with more reactive components to be effective. Silica fume, particularly in ultra-fine form, significantly accelerates hydration and enhances C-S-H gel formation, improving the early microstructure of concrete. Slag contributes synergistically by forming C-A-S-H gel, and the best early-strength results are obtained when it is combined with Fly ash and silica. The optimal blend of these three materials can achieve compressive strength above 20 MPa in 1 day and over 40 MPa in 7 days without thermal curing. The study concludes that structured use of mineral admixtures can accelerate concrete hardening, improve construction efficiency, and support sustainable building practices. Further research is recommended at industrial scale, including exploration of locally sourced alternatives and development of data-driven predictive models
Integrasi Green–Blue Infrastructure untuk Ketahanan Iklim dan Air di Nusa Tenggara Timur: Sebuah Systematic Literature Review dari Perspektif Semi-Arid Urban Systems Bara, Alvin Alfredo; Cornelis, Remigildus; Lau, Debora
Jurnal Kridatama Sains dan Teknologi Vol 7 No 02 (2025): Jurnal Kridatama Sains dan Teknologi
Publisher : Universitas Ma'arif Nahdlatul Ulama Kebumen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53863/kst.v7i02.1902

Abstract

The semi-arid region of East Nusa Tenggara (NTT) faces increasing environmental pressures, including prolonged droughts, rising surface temperatures, and rapid runoff during short, intense rainfall events. These conditions necessitate nature-based solutions to restore hydrological balance and strengthen climate resilience. This study aims to identify the effectiveness of Green Infrastructure (GI) and Blue Infrastructure (BI) in addressing water scarcity and urban heat challenges, and to formulate an integrated GI–BI model that is adaptive to the socio-ecological conditions of NTT. A Systematic Literature Review (SLR) was conducted following PRISMA guidelines by examining nine recent international publications on GI–BI performance in semi-arid regions. Synthesis of the nine studies indicates that combinations of GI elements (bio-retention, green roofs, vegetated spaces, street trees) and BI components (retention ponds, natural channels, micro-reservoirs) consistently contribute to restoring 82–90% of pre-development water balance, reducing runoff by 35–45%, and lowering air temperatures by 3–5°C, depending on spatial configuration and local climatic variability. Key barriers to implementation include limited financing, weak cross-sectoral coordination, and insufficient long-term performance data. These findings underscore that GI–BI functions not only as technical interventions but also as critical policy instruments for adaptive spatial planning, green financing frameworks, and remote-sensing–based environmental monitoring in NTT. The study highlights the urgency of developing an integrated long-term implementation framework to ensure the sustainability of GI–BI adoption in enhancing regional climate resilience
Penguatan Keterampilan Guru dalam Pembelajaran Berbasis Digital dan Artificial Intelligence Di SMK St. Wilibrodus Kabupaten Malaka Asrial, Asrial; Klau, Ralno R.; Bara, Alvin A.; Fauzan, Tengku A.; Ly, Aditya; Edyan, Roly
Jurnal Kelimutu Pengabdian Masyarakat Vol 5 No 2 (2025): Kelimutu Journal of Community Service (KJCS)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/kjcs.v5i2.25253

Abstract

SMK St. Wilibrodus merupakan salah satu sekolah berada di kabupaten malaka SMK St. Wilibrodus Betun adalah sekolah menengah kejuruan swasta yang berlokasi di Jalan Ahmad Yani, Wehali, Kecamatan Malaka Tengah, Kabupaten Malaka, Provinsi Nusa Tenggara Timur. Guru SMK juga berperan dalam membangun karakter dan etos kerja siswa. Dunia industri tidak hanya menuntut keterampilan teknis, tetapi juga sikap profesional, kedisiplinan, dan kemampuan bekerja dalam tim. Guru harus mampu menanamkan nilai-nilai tersebut dalam proses pembelajaran agar siswa dapat beradaptasi dengan lingkungan kerja yang sesungguhnya. Melalui pendekatan yang berbasis praktik dan pengalaman, guru dapat membantu siswa mengembangkan soft skills seperti komunikasi, kepemimpinan, serta problem solving yang sangat dibutuhkan dalam dunia kerja. Kegiatan ini diawali dengan pelaksanaan survei mengenai kondisi dan kebutuhan SMK. Setelah itu, tim melakukan diskusi untuk memastikan program yang dijalankan. Melaksanakan pelatihan yang dirancang untuk mendukung peningkatan kapasitas dan kompetensi mitra. Evaluasi untuk menilai sejauh mana kegiatan yang dilaksanakan mampu mencapai tujuan yang telah direncanakan. Program memberikan dampak positif bagi guru dalam meningkatkan kemampuan memanfaatkan teknologi digital dan AI dalam proses pembelajaran. Guru yang menjadi peserta kegiatan menunjukkan peningkatan pemahaman serta keterampilan praktis dalam mengintegrasikan media digital dan aplikasi berbasis kecerdasan buatan untuk mendukung inovasi pembelajaran di kelas
KUANTIFIKASI PENGARUH TERMINAL BAYANGAN TERHADAP KINERJA SIMPANG TAK BERSINYAL BERBASIS PKJI 2023 Ridwan Rinaldo Loe; Andi Kumalawati; Remigildus Cornelis; Alvin Alfredo Bara4
Racic : Rab Construction Research Vol. 11 No. 1 (2026): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v11i1.8126

Abstract

Informal terminals are unofficial public transport stopping points that generate side friction and may degrade the performance of urban unsignalized intersections. This study evaluates the performance of the Sikumana four-leg unsignalized intersection in Kupang City and quantifies performance changes caused by informal terminal activities. A quantitative descriptive case-study approach was applied using the Indonesian Highway Capacity Guidelines (PKJI) 2023, with level of service classified according to HCM 2000. Primary data were collected through surveys of geometry, traffic volume, speed, side friction, and informal terminal activities over seven days during three peak periods. Four scenarios were analyzed: existing 2025 with the informal terminal, 2025 without it, and 2030 projections with and without it. At the peak hour (Monday, 11 August 2025, 17.00–18.00), traffic flow reached 2,765.60 pcu/hour against a capacity of 2,701.10 pcu/hour, yielding a degree of saturation of 1.024, delay of 20.184 sec/pcu, queue probability of 42.15–83.59%, and LoS C. Removing the informal terminal increased capacity by 2.15%, reduced the degree of saturation to 1.002 and delay to 19.160 sec/pcu, yet the intersection remained oversaturated at LoS C. The 2030 projection shows LoS E in both scenarios; therefore, informal terminal management should be combined with staged traffic management.
Co-Authors Andi Kumalawati Asrial Fauzan, Tengku A. Klau, Ralno R. Lau, Debora Ly, Aditya Remigildus Cornelis Ridwan Rinaldo Loe Roly Edyan