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All Journal RACIC : Rab Construction Research Jurnal Kridatama Sains dan Teknologi Kreasi: Jurnal Inovasi dan Pengabdian Kepada Masyaraka Jurnal Ilmiah Kurva Teknik 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 Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Social Sciences Transportation 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
ANALISIS KELAYAKAN STRUKTUR ATAS MUNGKUNG OVERPASS MENGGUNAKAN METODE RATING FACTOR Debora Lau; Miguel Felix Wijaya; Yulita Prasinda; Remigildus Cornelis; Alvin A. Bara; Irvebry Ayu Wulandari; Akhmad Aminullah
Jurnal Ilmiah Kurva Teknik Vol. 15 No. 1 (2026): Jurnal Ilmiah Kurva Teknik
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Mahasaraswati Denpasar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36733/jikt.v15i1.13577

Abstract

Keandalan struktur jembatan tol eksisting perlu dievaluasi secara berkala untuk menjamin keselamatan pengguna dan keberlanjutan layanan lalu lintas. Peningkatan volume serta beban kendaraan yang tidak selalu sesuai dengan asumsi perencanaan awal berpotensi memengaruhi kapasitas aktual struktur. Penelitian ini bertujuan untuk mengevaluasi kelayakan struktur atas Overpass Mungkung yang berada pada ruas Tol Ngawi–Kertosono melalui pendekatan load rating dengan indikator rating factor (RF). Objek penelitian merupakan jembatan beton prategang tipe PCI girder dengan empat bentang, yang dianalisis menggunakan data sekunder berupa dokumen perencanaan dan data teknis, serta data hasil survei lapangan untuk verifikasi kondisi eksisting. Pemodelan numerik struktur dilakukan menggunakan perangkat lunak SAP2000 dengan merepresentasikan geometri, properti material, sistem tumpuan, dan konfigurasi tendon prategang sesuai kondisi aktual. Pembebanan dimodelkan mengacu pada ketentuan SNI dan AASHTO yang meliputi beban mati, beban mati tambahan, dan beban lalu lintas. Evaluasi kelayakan dilakukan dengan menghitung rating factor momen (RFM) dan rating factor gaya geser (RFS) pada girder interior dan eksterior di setiap bentang. Hasil analisis menunjukkan bahwa seluruh elemen superstruktur memiliki nilai RFM dan RFS yang berada di atas batas minimum kelayakan, yang mengindikasikan bahwa struktur masih mampu menahan beban layanan dengan cadangan kapasitas yang memadai. Bentang 1 dan 4 menunjukkan kinerja struktural yang relatif lebih baik dibandingkan bentang lainnya, sementara bentang 2 dan 3 tetap berada pada kategori aman tanpa indikasi kebutuhan rehabilitasi struktural. Secara keseluruhan, struktur atas Mungkung Overpass dinyatakan masih layak beroperasi sebagai jembatan tol aktif, dengan rekomendasi pemantauan rutin sebagai bagian dari pengelolaan aset jembatan.
STUDI EKSPERIMENTAL KUAT TEKAN MORTAR EPOXY DENGAN KOMPOSISI CAMPURAN SENDIRI SEBAGAI MATERIAL PERBAIKAN BETON BONAVENTURA HARYANTO UMBU TAY; Faras Y. Alfarisy; Ryan Iskandar; Alvin Alfredo Bara
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.v11i1.6617

Abstract

This study aims to evaluate the compressive strength performance of custom-mixed epoxy mortar as an alternative concrete repair material, compared to the ready-mix Sikafloor-81 Epocem. The epoxy mortar was composed of epoxy resin, cornice adhesive, and silica sand, with three epoxy ratios: 0.5, 0.7, and 1.0 by weight of cornice. Compressive strength tests were conducted at 7, 14, and 28 days. Results showed that RE 0.7 and RE 1.0 variants exceeded the 45 MPa target at 28 days, with the highest value reaching 53.80 MPa. In contrast, the Sikafloor-81 Epocem exhibited strength reduction over time. ANOVA confirmed statistically significant differences among the variants. Therefore, the custom epoxy mortar proved superior and feasible to be developed as a reliable solution for concrete repair applications
PENGARUH METODE PERAWATAN MORTAR BERBASIS SUSPENSI Bacillus subtilis TERHADAP KUAT TEKAN MORTAR Alvin Alfredo Bara; Remigildus Cornelis; Moses Kopong Tokan
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.v11i1.7579

Abstract

This study aims to investigate the effect of curing methods based on Bacillus subtilis suspension on the compressive strength of cement mortar. The curing methods included immersion and wrapping using flannel cloth, non-woven geotextile, and plastic wrapping, with bacterial suspension concentrations of 3%, 6%, 9%, and 12%, and curing ages of 7, 14, 28, and 56 days. Compressive strength tests were conducted on control mortar and bacterial-treated mortar in accordance with standard testing procedures. The results indicate that mortars cured using Bacillus subtilis suspension exhibited higher compressive strength than the control mortar at all curing ages. The strength enhancement became more pronounced at 28 and 56 days, reaching a maximum value of 55.07 MPa for immersion curing, compared to 36.48 MPa for the control mortar. Wrapped curing methods also produced higher compressive strength values than the control, reaching 39.18 MPa, indicating effective moisture retention during the curing process. The variation in bacterial concentration showed an optimum trend, suggesting that compressive strength improvement does not increase proportionally with higher bacterial concentrations. Overall, the findings demonstrate that Bacillus subtilis–based curing methods significantly improve mortar compressive strength and have strong potential as an alternative, practical, and sustainable curing approach.
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.
Penguatan Hygiene Sanitasi Berbasis CHSE pada Destinasi Wisata Pantai Oesina Kecamatan Kupang Barat Kabupaten Kupang Hikmah Hikmah; Asrial Asrial; Roly Edyan; Andriana Deku; Tengku A. Fauzansyah; Alvin A. Bara; Aditya Ly; Gauris P. Er Lambang
Kreasi: Jurnal Inovasi dan Pengabdian kepada Masyarakat Vol. 6 No. 2 (2026): Juli
Publisher : BALE LITERASI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58218/kreasi.v6i2.3855

Abstract

Destinasi Wisata Pantai Oesina di Desa Lifuleo, Kecamatan Kupang Barat, merupakan aset wisata pesisir dengan daya tarik pasir putih, perairan dangkal, fasilitas lopo/gazebo, dan potensi ekowisata berbasis masyarakat. Peningkatan aktivitas wisata perlu disertai pengelolaan hygiene sanitasi yang memadai agar risiko kesehatan lingkungan dapat dicegah dan kenyamanan wisatawan meningkat. Penerapan higiene dan sanitasi di destinasi wisata pantai sangat penting untuk menjaga kualitas lingkungan, mencegah pencemaran dan penyebaran penyakit, serta menjamin kesehatan, keamanan, dan kenyamanan wisatawan secara berkelanjutan. Kegiatan pengabdian kepada masyarakat ini bertujuan memperkuat pengetahuan, kesadaran, dan praktik awal hygiene sanitasi pada kawasan Pantai Oesina. Metode pelaksanaan menggunakan pendekatan edukatif-partisipatif melalui observasi lapangan, koordinasi, penyuluhan, diskusi partisipatif, praktik kebersihan lingkungan, dokumentasi, serta penyusunan rekomendasi operasional. Hasil kegiatan menunjukkan bahwa isu prioritas meliputi ketersediaan dan kualitas air bersih, pemeliharaan toilet/MCK, pengelolaan sampah, pengendalian air limbah, hygiene kios kuliner, dan perilaku wisatawan. Luaran kegiatan berupa model lima pilar hygiene sanitasi, yaitu air bersih dan uji kualitas, toilet/MCK laik sehat, sampah terpilah dan 3R, limbah cair terkendali, serta hygiene personal dan kios kuliner. Rencana tindak lanjut meliputi audit sanitasi berkala, logbook kebersihan, penyediaan sarana cuci tangan, pemilahan sampah, pemeriksaan kualitas air, serta integrasi prinsip CHSE dalam tata kelola destinasi. Kegiatan ini menegaskan bahwa sanitasi wisata pantai harus dikelola sebagai sistem kawasan kolaboratif yang melibatkan pengelola, pokdarwis, pedagang, wisatawan, pemerintah desa, pemerintah daerah, dan perguruan tinggi.
Identifikasi Pendekat Dominan dan Analisis Sensitivitas Kapasitas Simpang APILL Patung Kirab Kota Kupang Berdasarkan PKJI 2023 Benny Tua Siahaan; Adveni Hesty Altisari Lada; Ari Esclesias Sinaga; Alvin Alfredo Bara
Jurnal Kridatama Sains dan Teknologi Vol 8 No 02 (2026): 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.v8i02.2426

Abstract

Urban traffic growth increases operational pressure on signalized intersections, particularly in areas serving commercial, office, educational, and residential activities. This study evaluates capacity, operational performance, and critical approaches at the Patung Kirab signalized intersection in Kupang City based on the Indonesian Road Capacity Guidelines 2023 (PKJI 2023). The novelty of this study lies in integrating aggregate intersection performance evaluation with approach-based flow distribution analysis and capacity-improvement sensitivity scenarios to determine operational treatment priorities for a medium-sized city in Eastern Indonesia. A descriptive quantitative approach was applied through classified traffic-volume surveys, geometric observations, signal-timing observations, and side-friction observations over three days: Sunday 9 November 2025, Monday 10 November 2025, and Tuesday 11 November 2025. Surveys were conducted during three periods, namely 06:00–08:00, 12:00–14:00, and 18:00–20:00 WIT, and the analysis hour was selected based on the highest traffic volume for each observation day. The results show that the intersection capacities on Sunday, Monday, and Tuesday were 3,734.08, 3,645.51, and 3,589.57 skr/hour, respectively. The corresponding degrees of saturation were 0.739, 1.139, and 0.936, while the average delays were 4.125, 29.220, and 16.604 seconds/skr. Monday was oversaturated, whereas Tuesday operated in a critical range. The southern approach was dominant on Sunday and Monday, contributing 40.71% and 40.66% of total traffic flow, whereas the western approach was dominant on Tuesday, contributing 41.75%. The sensitivity analysis indicates that a 10% capacity increase would only reduce Monday's degree of saturation to 1.035, while Tuesday would decrease close to the planning threshold at 0.851. These findings indicate that initial treatments should prioritize green-time optimization for the southern and western approaches, side-friction control, and queue observation during peak hours
Co-Authors Aditya Ly Adveni Hesty Altisari Lada Aminullah, Akhmad Andi Kumalawati Andriana Deku Ari Esclesias Sinaga Asrial Asrial Asrial Benny Tua Siahaan BONAVENTURA HARYANTO UMBU TAY Debora Lau Faras Y. Alfarisy Fauzan, Tengku A. Gauris P. Er Lambang Hikmah Odang Irvebry Ayu Wulandari Klau, Ralno R. Lau, Debora Ly, Aditya Miguel Felix Wijaya Moses Kopong Tokan Remigildus Cornelis Ridwan Rinaldo Loe Roly Edyan Ryan Iskandar Tengku A. Fauzansyah Yulita Prasinda