Article Per Year (5 Year)
p-Index From 2021 - 2026
2.064
P-Index
This Author published in this journals
All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik ITS IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Jurnal Teknik Sipil Journal of Civil Engineering Jurnal Teknik Sipil Journal of Advanced Civil and Environmental Engineering Jurnal Penelitian Pendidikan IPA (JPPIPA) Civil Engineering Dimension Jurnal Aplikasi Teknik Sipil Jurnal Manajemen Aset Infrastruktur dan Fasilitas Logic : Jurnal Rancang Bangun dan Teknologi Portal: Jurnal Teknik Sipil Journal of Infrastructure and Facility Asset Management Publikasi Riset Orientasi Teknik Sipil (Proteksi) Seminar Nasional Ilmu Terapan Journal Integration of Management Studies
Januarti Jaya Ekaputri
Civil Engineering Department, Institut Teknologi Sepuluh Nopember, Surabaya
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Transportation

Published : 34 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 34 Documents
Search

 1   2   3   4 
Improving Geopolymer Characteristics with Addition of Poly-Vinyl Alcohol (PVA) Fibers Januarti Jaya Ekaputri; Chikako Fujiyama; Nobuhiro Chijiwa; Tu Dac Ho; Hung Thanh Nguyen
Civil Engineering Dimension Vol. 23 No. 1 (2021): MARCH 2021
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (606.075 KB) | DOI: 10.9744/ced.23.1.28-34

Abstract

This paper presents the benefits of PVA fibers in improving the mechanical properties of class F fly-ash-based geopolymer concrete. The activator used in the geopolymer was 8M sodium hydroxide (NaOH) and sodium silicate (Na2SiO3), with a mass ratio of Na2SiO3 to NaOH varied from 1.5 to 2.5. Cylindrical specimens with a diameter of 100 mm and a height of 200 mm were prepared for mechanical strength tests. The PVA fibers in the geopolymers were fixed at 0.4%, 0.6%, and 0.8% by total volume. Some mechanical tests were carried out, including compression, splitting, direct tensile and elastic modulus tests. It was found that the mixture with a ratio of alkalis of 1.5 and the PVA fiber content of 0.4% had the best workability. The highest compressive strength was obtained in a mixture with alkali activator ratios of 1.5 and 2.0, and with 0.6% fiber addition. The ratio of the tensile (and splitting-tensile) strength to compressive strength was found to increase with the certain amount of PVA fibers and the ratio of the alkali activators. The workability issue and fiber direction in the concrete were the dominant factors influencing the properties of geopolymer concrete.
Utilization Of Buton Asphalt Solid Waste (ASW) Waste Bitumen Extraction In Concrete Aulia, Siti Aja; Ekaputri, Januarti Jaya
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 7, No 1 (2024): April
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.7.1.48-64

Abstract

Indonesia has 650 million tons of Buton Rock Asphalt (Asbuton) deposits.  The mineral residue, known as Asphalt Solid Waste (ASW). The extraction left ASW by 65-90% of asbuton’s weight. However, 770 thousand tons/year of ASW remain underutilized, causing environmental pollution due to its hydrocarbon content. Based on XRD results, Asbuton minerals were dominated with 46% CaCO3, which are potential as a subtitute material in concrete. However, its hydrocarbon content at 68,911 ppm raises concerns. To prevent ASW hydrocarbons from contaminating concrete, solidification was attempted. This study investigates solidification by making Artificial Coarse Aggregate (ACA) products and using ASW as a subtitute for gravel in concrete. The ACAs were produced from a mixture of ASW and cement, molded into 50 x 100 mm cylinders, crushed after twenty eight-days moist curing, and tested according to ASTM C33 standard of gravel. ASW replaced 0-12.5% by volume of sand and ACA replaced 0-12.5% by volume of gravel in concrete with a target compressive strength of 45 MPa at twenty eight-days. Heat of hydration and shrinkage were tested to indentify the impact of CaCO3 from ASW on concrete. The results showed that ACA could reduce 9% of ASW hydrocarbons. However, the ACA produced did not meet the gravel standard in ASTM because ACA absorption reached 6.75% and abrasion test up to 57%. Neverthless, ASW’s high absorption reduced heat hydration by 10% and shrinkage by 83% compared to normal concrete.
Flocculant Assisted Treatment of Suspended Sidoarjo Mud Syihabuddin, Thilal; Ekaputri, Januarti Jaya; Fujiyama, Chikako
Jurnal Penelitian Pendidikan IPA Vol 11 No 11 (2025): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i11.11880

Abstract

This study investigates the use of lime-based flocculants as a treatment method for Sidoarjo mud (LUSI) to improve solid–liquid separation and reduce the environmental impact of its discharge into the Porong River. Several commercial lime-derived flocculants were tested through jar experiments to evaluate their effectiveness in promoting particle aggregation and enhancing settling behavior under conditions similar to the existing treatment pond. The results indicate that a mud-to-water ratio of 1:4 provided the most efficient sedimentation performance, reflected by faster settling rates and clearer supernatant. Among the flocculants examined, differences in chemical composition and particle morphology influenced the degree of aggregation and overall clarity of the treated water. The treatment substantially reduced turbidity and suspended solids, while also lowering chloride levels in the clarified water. These findings suggest that lime-based flocculants are a feasible option for mitigating the environmental burden of LUSI mud disposal by improving separation efficiency.
Performance and Durability of High-Volume Fly Ash Concrete Incorporating Bacillus safensis : A Comparative Study of Class C and Class F Fly Ash Amini, Iqlima Nuril; Syah, Dzikrie Fikriyan; Setiamarga, Davin H. Ekaputra; Basoeki, Makno; Danardi, Luki; Laory, Irwanda; Anda, Martin; Maulana, Mahendra Andiek; Wulandari, Meity; Ekaputri, Januarti Jaya
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 8, No 2 (2025): October
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.8.2.8-21

Abstract

This study investigates the performance and durability of high-volume fly ash (HVFA) concrete enriched with Bacillus safensis, focusing on the comparative influence of Class C and Class F fly ash. Concrete mixtures were prepared with varying proportions of both fly ash types, with and without microbial addition, and tested for fresh and hardened properties including compressive strength, splitting tensile strength, porosity, and workability. Durability was further evaluated using the rapid chloride penetration test (RCPT) and accelerated corrosion test (ACT).Results showed that Class C fly ash, with its higher calcium content, produced a denser microstructure and improved early compressive strength. In contrast, Class F fly ash supported more favorable long-term microbial activity due to greater porosity and water availability. Incorporating Bacillus safensis enhanced compressive strength by up to 8% and significantly reduced chloride ion penetration, particularly in Class F fly ash concrete, through calcium carbonate precipitation within the pores. However, microbial addition was associated with reduced splitting tensile strength, likely due to differences in failure mechanisms. Long-term observations revealed strength gains of up to 13.3% after one year in microbial HVFA concrete.These findings demonstrate the synergistic contribution of Bacillus safensis and the effect of fly ash type to the improvement of sustainability and durability of HVFA concrete.
Co-Authors . Faimun Achmad Freddya Eka Prasandha Adha, Augusta Adlizie Rifkianda Muhammad Adriyan Candra Purnama Afgani, Kurnia Fajar Ahyudanari, Ervina Aji, Pujo Amini, Iqlima Nuril Anda, Martin Annisa Rahmadina Antonius Antonius Ari Widayanti Ari Widayanti Ari Widayanti Aulia, Siti Aja Azwar Annas Bari, M. Shahib Al Basoeki, Makno Buntara S. Gan Chikako Fujiyama Danardi, Luki Diana, Nur Ayu Dimas Setiyo Nugroho Dora Melati Nurita Sandi Dwa Desa Warnana Fujiyama, Chikako Han Ay Lie Hendrawan Setyo Warsito Herry Budianto Hitapriya Suprayitno, Hitapriya Hung Thanh Nguyen Ign. Harry Sumartono Imam Junaidi Indarto Indarto Irawan, Candra Junaedi Utomo, Junaedi Kusbiantoro, Andri Laory, Irwanda M. Shahib Al Bari M. Shofi’ul Amin Makno Basoeki Maulana, Mahendra Andiek Nikmatus Solikha Nobuhiro Chijiwa Prastyanto, Catur Arif Raden Aswin Rahadi Ratna Handayani Ria Asih Aryani Soemitro Ridho Bayuaji Setiamarga, Davin H. E. Setiamarga, Davin H. Ekaputra Sidiq Purnomo Syah, Dzikrie Fikriyan Syihabuddin, Thilal Toni Budi Santoso Trihanyndio Rendy Satrya Triwulan Triwulan Triwulan Triwulan Triwulan Triwulan Triwulan Triwulan Triwulan Triwulan Triwulan Triwulan Triwulan Triwulan Tu Dac Ho Vandi Alextrianto Widi Astuti Winda Agustin Wiwik Handayani Wulandari, Meity Yeni Rochsianawati Yusak Nurrizki