The effect of adding palm shell ash on soil shear strength Debby Endriani, Nor Faizah Bawadi, Ahmad Hafizullah Ritonga Iop Conference Series Earth and Environmental Science, 2025 The soil in Tanjung Rejo Village, Percut Sei Tuan, Deli Serdang, is characterized by fine-grained clay with low stability. To enhance stability, this study focuses on soil stabilization using palm shell ash mixtures at varying percentages (0%, 4%, 6%, 8%, 10%, and 12%) under optimum moisture conditions. Stabilization involves mixing the clayey soil with additional materials to improve its technical properties, specifically employing palm kernel shell ash. Testing was conducted following ASTM methods. As the percentage of palm shell ash in the mixture increased, both cohesion and friction angle values showed an increasing trend, reaching optimal values at 10% palm shell ash. The Direct Shear test on native soil yielded the cohesion of 10.3 KPa and a shear angle of 14.6°, whereas the most optimum values for cohesion (14.1 KPa) and friction angle (24.60°) were observed in the soil mixture with 10% Palm Shell Ash (PSA). The palm shell ash mixture has good potential for use in road pavement, especially in Tanjung Rejo Village, Percut Sei Tuan, Deli Serdang, North Sumatra, Indonesia.
Catalytic Innovation for Renewable Energy: TiO2-Supported Precipitated Calcium Carbonate Catalyst for Eco-Friendly Biodiesel Synthesis Vivi Sisca, Syukri, Zilfa, Novesar Jamarun, Denny Akbar Tanjung, et al. Baghdad Science Journal, 2025 إن الوقود الحيوي المنتج من خلال تفاعلات الاسترة مع محفزات قاعدية متجانسة وغير متجانسة هو مصدر طاقة بديل واعد. تستخدم هذه الدراسة كربونات الكالسيوم المترسبة (PCC) المخصبة بثاني أكسيد التيتانيوم لإنتاج الوقود الحيوي من زيت نباتي مستعمل. تم التعرف على المحفز المصنّع بشكل شامل من خلال تحليلات XRD وXRF وSEM وBET وFT-IR ثم تم تطبيقه في تفاعل الاسترة. أظهرت النتائج أن PCC المخصب بثاني أكسيد التيتانيوم هو محفز فعال، ينتج الوقود الحيوي بكفاءة 95.09٪ في ظل الظروف المثلى: محفز 5٪ بالوزن، ونسبة الميثانول إلى الزيت 6: 1، ودرجة حرارة التفاعل 65 درجة مئوية، ووقت التفاعل 4 ساعات. أدى تحسين الخصائص الحفزية، وزيادة مساحة السطح، وتعزيز المواقع الأساسية إلى تحسين إنتاج الوقود الحيوي بشكل كبير.
Bearing capacity of Percut Sei Tuan clay stabilized with palm shell ash Debby Endriani, Nor Faizah Bawadi, Aazoki Waruwu, Ahmad Hafizullah Ritonga Iop Conference Series Earth and Environmental Science, 2024 Improvements to the bearing capacity of the soil have been carried out and developed at this time, one of which is the stabilization of clay soils. There are several alternatives to solve low soil bearing capacity, one of which is using geo-synthetic materials but has a weakness in terms of high cost. Another alternative is to add palm shell ash as a stabilizing agent. The effect of adding palm shell ash has not been thoroughly studied, so further research is needed. The material added is palm shell ash with a variation of 0%, 4%, 8%, 10%, and 12% in each test. The tests carried out in the laboratory were water content (w), specific gravity test (Gs), Atterberg limit test, sieve analysis (sieve analysis), soil compaction test, and CBR (California Bearing Ratio) test. The CBR test was carried out by curing the soil for 1, 3, 5, and 7 days with a mixture of palm shell ash before compaction. The soil in this study belongs to the A-7-5 group. The CBR (California bearing ratio) value increased with the increase in the palm shell ash percentage in the mixture after curing the soil. The highest CBR value was in the variation of 12% palm shell ash with a 7-day curing period of 6.92% with a soil bearing capacity of 5.06.
Kimia Polimer Farmasi AH Ritonga PT. Bukuloka Literasi Bangsa , 2026 2026
The Influence of Activated Carbon Produced from Duck Eggshells as an Adsorbent for Free Fatty Acid Content of Used Cooking Oilc B Aritonang, AH Ritonga, K Harefa, H Herlina, DY Wiratma JURNAL FARMASIMED (JFM) 8 (2), 1018-1024 , 2026 2026
Anti-Inflammatory Potential of Combined Turmeric Rhizome Extract (Curcuma longa L.) and Hydroxyapatite in Male White Mice (Mus musculus) AH Ritonga, F Amelia, H Herlina, B Aritonang, K Harefa JURNAL FARMASIMED (JFM) 8 (2), 835-843 , 2026 2026
Efektivitas Antimikroba Kombinasi Ekstrak Etanol Rimpang Kunyit (Curcuma longa L.) dan Hidroksiapatit dalam Menghambat Pertumbuhan Streptococcus sobrinus AH Ritonga, KE Purba, B Aritonang, H Herlina, K Harefa Jurnal Indah Sains dan Klinis 7 (1), 1-8 , 2026 2026
The Role of Quality Management in Ensuring the Accuracy of Clinical Laboratory Test Result at Grandmed Lubuk Pakam Hospital S Ramadhani, AH Ritonga, B Lubis JURNAL KESMAS DAN GIZI (JKG) 8 (2), 1530-1537 , 2026 2026
Analysis of the Effectiveness of Quality Management through the Implementation of Quality Assurance (QA) and Quality Control (QC) in Improving Microbiology Laboratory … R Rahmawati, AH Ritonga, S Siregar JURNAL KESMAS DAN GIZI (JKG) 8 (2), 1544-1551 , 2026 2026
Laboratory Officer Compliance with Standard Operating Procedures at the Laboratory Installation of Grandmed Lubuk Pakam Hospital Based on the Quality of Laboratory Examination … A Prahesti, AH Ritonga, NBG Munthe JURNAL KESMAS DAN GIZI (JKG) 8 (2), 1538-1543 , 2026 2026
Buku Ajar Kimia Organik 1 AH Ritonga CV. Inovasi Publishing Indonesia 1, 1-305 , 2026 2026
Oleic acid-modified zinc oxide incorporated compatibilized PLA/LLDPE nanocomposites: Physical, mechanical, thermal, and morphological properties AH Ritonga, B Aritonang, D Meilani, H Herlina, V Sisca, GE Putri, ... South African Journal of Chemical Engineering 56 (April), 100869 , 2026 2026
Solvent-free steam extraction of Citrus nobilis Peel essential oil: Chemical composition and bioactivity GE Putri, S Arief, N Jaffar, P Dafriani, IY Darma, V Sisca, AH Ritonga, ... Results in Chemistry, 103141 , 2026 2026
Biosynthesis of Zinc Oxide Nanoparticles Using Noni Fruit Extract (Morinda citrifolia) for Indigo Carmine Photodegradation V Sisca, N Budhiandini, D Annas, A Rahayu, AH Ritonga Moroccan Journal of Chemistry 14 (1), 136-151 , 2026 2026 Citations: 5
Chemical Communication, Information, and Education (CIE) in Enhancing the Safety of School Snacks H Herlina, AH Ritonga, K Harefa, RS Sitorus, I Hafiz JURNAL PENGMAS KESTRA (JPK) 5 (2), 195-201 , 2025 2025
Development of Molecularly Imprinted Polymer Materials as Selective Recognition Elements for Electrochemical Meropenem Sensors H Herlina, AH Ritonga, A Febriady, A Rahayu, NG Sinaga JURNAL FARMASIMED (JFM) 8 (1), 265-274 , 2025 2025
The Effect of a Combination of Activated Carbon and Bentonite on Reducing COD, BOD, and TSS Levels in Tofu Industry Wastewater B Aritonang, AH Ritonga, K Harefa, DY Wiratama, H Herlina JURNAL FARMASIMED (JFM) 8 (1), 405-412 , 2025 2025
Application of Chemical Principles in the Preparation of Infused Water as an Educational Effort to Prevent Hyperglycemia at SMK Negeri Pantai Labu AH Ritonga, H Herlina, FR Harahap, RS Sitorus, K Harefa JURNAL PENGMAS KESTRA (JPK) 5 (1), 1-7 , 2025 2025
Enhancement of Asphalt Resilience through Functionalization of Natural Rubber with Glycidyl Methacrylate, Maleic Anhydride, and Divinylbenzene NR Wijaya, Tamrin, Eddiyanto, JA Laksmono, AH Ritonga International Journal of Technology 16 (3), 993-1003 , 2025 2025 Citations: 3
Relationship Between Implementation of Risk Analysis (Risk Assessment) and Reducing Patient Safety Incidents in Inpatient Installations AH Ritonga JURNAL KESMAS DAN GIZI (JKG) 7 (2), 493-501 , 2025 2025
Reduction of BOD, COD, and TSS in Textile Wastewater Using Bentonite Activated Charcoal Adsorbent B Aritonang, AH Ritonga, K Harefa Jurnal Farmasimed (JFM) 7 (2), 381-389 , 2025 2025 Citations: 5
Aktivitas Antibakteri Kombinasi Ekstrak Etanol Daun Mangga (Mangifera indica L.) dengan Hidroksiapatit dan Organo-Hidroksiapatit terhadap Staphylococcus aureus AH Ritonga, H Herlina, B Aritonang, SA Lestari, R Safitri Jurnal Dunia Farmasi 9 (2), 77-90 , 2025 2025
Hybrid polyol-based polyurethane from pine merkusii resin and polyethylene glycol 400 for sustainable asphalt modification Tamrin, S Lenny, M Misran, AH Ritonga, M Syaftiani South African Journal of Chemical Engineering 53 (July), 12-20 , 2025 2025
MOST CITED SCHOLAR PUBLICATIONS
Organic Modification of Precipitated Calcium Carbonate Nanoparticles as Filler in LLDPE/CNR Blends with the Presence of Coupling Agents: Impact Strength, Thermal, and Morphology AH Ritonga, N Jamarun, S Arief, H Aziz, DA Tanjung, B Isfa, V Sisca, ... Journal of Materials Research and Technology 17 (C), 2326-2332 , 2022 2022.0 Citations: 31
Aktivitas Antibakteri Ekstrak Etanol Kulit Markisa Ungu (Passiflora Edulis Sims) Terhadap Bakteri Propionibacterium Acnes K Harefa, B Aritonang, AH Ritonga Jurnal Multidisiplin Madani 2 (6), 2743-2758 , 2022 2022.0 Citations: 25
Green synthesis of cerium oxide nanoparticles using Citrus nobilis Lour. peel extract and evaluation of their potential as antibacterial and antioxidant agents GE Putri, A Labanni, S Arief, P Dafriani, IY Darma, S Handayani, N Jaffar, ... Case Studies in Chemical and Environmental Engineering 11 (June 2025), 101062 , 2024 2024.0 Citations: 24
Influence of LLDPE-g-MA on Mechanical Properties, Degradation Performance and Water Absorption of Thermoplastic Sago Starch Blends DA Tanjung, N Jamarun, S Arief, H Aziz, AH Ritonga, B Isfa Indonesian Journal of Chemistry 22 (1), 171-178 , 2022 2022.0 Citations: 23
The enhancement of mechanical, physical, and thermal properties of modified asphalt mixture with lignin from mahogany sawdust in the presence of diphenylmethane 4,4'-diisocyanate Tamrin, AH Ritonga, B Aritonang International Journal of Adhesion and Adhesives 125, 103431 , 2023 2023.0 Citations: 19
Improvement of Mechanical, Thermal, and Morphological Properties of Organo-Precipitated Calcium Carbonate Filled LLDPE/Cyclic Natural Rubber Composites AH Ritonga, N Jamarun, S Arief, H Aziz, DA Tanjung, B Isfa Indonesian Journal of Chemistry 22 (1), 233-241 , 2022 2022.0 Citations: 19
Pembuatan Sabun Padat Antiseptik Ekstrak Etanol Kulit Jeruk Lemon (Citrus limon (L.) Burm. f.) EM Sinaga, B Aritonang, NF Ambarwati, AH Ritonga Jurnal Indah Sains dan Klinis 2 (3), 17-24 , 2021 2021.0 Citations: 19
Counseling on the Use of Infused Water for Body Health in Junior High School Amal Luhur Medan AH Ritonga, B Aritonang, K Harefa, RS Sitorus, Herlina, D Meilani Jurnal Pengmas Kestra (JPK) 2 (2), 184-190 , 2022 2022.0 Citations: 12
Modifikasi Aspal Polimer Memanfaatkan Karet Ban Bekas Menggunakan Divenil Benzena dan Dikumil Peroksida Melalui Proses Ekstruksi AH Ritonga Jurnal Kimia Saintek dan Pendidikan 1 (1), 8-13 , 2017 2017.0 Citations: 10
Purification of used Cooking Oil using a Combination of Activated Carbon and Bentonite Adsorbents B Aritonang, AH Ritonga, K Harefa, DY Wiratma, H Herlina Jurnal Farmasimed (JFM) 7 (1), 31-40 , 2024 2024.0 Citations: 9
Biokimia Kesehatan GE Putri, BD Putri, AH Ritonga, Gusfiyesi, Futeri, Renny CV. Mega Press Nusantara , 2023 2023.0 Citations: 9
Biosorption of Hexavalent Chromium Cr (VI) using Microalgae Scenedesmus sp as Environmental Bioindicator R Kartika, AH Ritonga, L Sulastri, S Nurliana, D Irawan, P Simanjuntak International Journal of Technology 14 (4), 791-799 , 2023 2023.0 Citations: 9
The Influence of Oleic Acid and Benzoyl Peroxide Against Oleic Acid Grafted onto LLDPE AH Ritonga, N Jamarun, S Arief, H Aziz, DA Tanjung, B Isfa Rasayan Journal of Chemistry 15 (1), 190-196 , 2022 2022.0 Citations: 9
Pembuatan Aspal Polimer Menggunakan Karet SIR-20 Yang Diinisiasi Oleh Adanya Dikumil Peroksida Melalui Proses Ekstrusi AH Ritonga Jurnal STIKNA 1 (2), 123-130 , 2017 2017.0 Citations: 9
Karakterisasi Aspal Polimer Dari Limbah Polistirena dan Serbuk Karet Ban Bekas Menggunakan Divenil Benzena dan Inisiator Dikumil Peroksida AH Ritonga Akademia 21 (2), 7-14 , 2017 2017.0 Citations: 9
H.(2022). Antibacterial Activity of Ethanol Extract of Purple Passion Fruit Peel (Passiflora Edulis Sims) on Propionibacterium Acnes Bacterial K Harefa, B Aritonang, A Ritonga Jurnal Multidisiplin Madani 2 (6), 2743-2758 , 0 Citations: 9
The impact of butterfly pea flower (Clitoria ternatea L.) extract on atherosclerosis biomarker profiles in obese white rats (Rattus norvegicus L.) K Harefa, AH Ritonga, B Aritonang, R Gurusinga, S Wulan, I Irmayani Journal of Biomedicine and Translational Research 10 (1), 7-14 , 2024 2024.0 Citations: 8
Effects of LLDPE on Mechanical Properties, Degradation Performance, and Water Absorption of Thermoplastic Sago Starch Blends DA Tanjung, N Jamarun, S Arief, H Aziz, B Isfa, AH Ritonga, V Sisca International Journal of Technology 14 (1), 173-184 , 2023 2023.0 Citations: 8
Improving Mechanical and Physical Properties on Thermoplastic Sago Starch Blends with the Addition of Polypropylene DA Tanjung, N Jamarun, S Arief, H Aziz, AH Ritonga, B Isfa Rasayan Journal of Chemistry 14 (4), 2451-2458 , 2021 2021.0 Citations: 8
Pemanfaatan limbah sekam padi sebagai bahan dasar pembuatan briket arang AH Ritonga, DA Tanjung Pelita Masyarakat 1 (1), 39-45 , 2019 2019.0 Citations: 8
