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All Journal IPTEK The Journal of Engineering Rekayasa Sipil Journal of Civil Engineering Civil Engineering Journal Jurnal Aplikasi Teknik Sipil Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Sewagati Jurnal Teknik Sipil Advance Sustainable Science, Engineering and Technology (ASSET) Conference Proceeding on Waste Treatment Technology
Yuyun Tajunnisa
Departemen Teknik Infrastruktur Sipil, Fakultas Vokasi, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Other

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Stress-Strain Behavior of Confined Class C Fly Ash-Based Geopolymer Concrete Galih Syifa’ul Ummah; Bambang Piscesa; Yuyun Tajunnisa
IPTEK The Journal of Engineering Vol. 10 No. 2 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v10i2.a20757

Abstract

Fly ash-based geopolymer cement has recently attracted attention due to its application potential, as well as being an alternative binder with low emissions compared to conventional portland cement in concrete production. Studies intended on the mechanical properties and behaviors of structural elements produced from class C fly ash-based geopolymer concrete are important to improve the implementation. This study aimed to determine the effect of confinement on the behavior of class C fly ash-based geopolymer concrete and portland cement-based concrete. Six specimens were made with class C fly ash-based geopolymer concrete tested under axial loading. Then, six specimens were made with ordinary portland cement-based concrete for comparison. The variable considered in this study is the pitch of confinement. The effect of the pitch of confinement on the enhancement strength and stress-strain of class C fly ash-based geopolymer concrete was obtained. The analytical model proposed by Richard et al. was selected to evaluate the ultimate compressive strength and ultimate compressive strain of confined geopolymer concrete in this study. The results showed that confinement reinforcement improved the strength and ductility of class C fly ash-based geopolymer concrete.
Role of Limestone Addition in Improving the Initial Compressive Strength of Geopolymer Concrete for Corrosive Environment Repair Arwinda Aribah Cahyani; Nur Ahmad Husin; Ridho Bayuaji; Yuyun Tajunnisa
IPTEK The Journal of Engineering Vol. 10 No. 2 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v10i2.a20763

Abstract

Geopolymer Concrete (GC) is highly durable in corrosive environments, making it a viable material for repair. However, its initial compressive strength was below the 7 megapascals required at one-day age. Adding fine limestone (45 micrometer) can improve GC's density and early strength. This study explores the effects of adding 0 percent, 3 percent, 5 percent, and 7 percent limestone and 1 percent sucrose superplasticizer to GC 16M. The compressive strength was tested at 1, 3, 7, and 28 days, along with slump, permeability, and resistivity tests to assess the durability. The results show that adding 5 percent limestone yields the optimal GC performance for repairing corrosive environments. The compressive strengths were 15.96, 28, 43, and 67.14 megapascals at 1, 3, 7, and 28 days, with a slump of 120 millimeters. The permeability and resistivity results were 0.128 × 10^-16 square meters and 57.87 kiloohm-centimeter, indicating normal corrosion levels. These findings confirm that GC with 5 percent limestone meets the durability and strength requirements of repair materials in corrosive environments.
Early Age Strength of Development Ultra High-Performance Concrete Using Class-F Fly Ash and Local Materials for Repair Kharisma Keysia Paramitha; Yuyun Tajunnisa; Wiwik Dwi Pratiwi
IPTEK The Journal of Engineering Vol. 10 No. 2 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v10i2.a20764

Abstract

Ultra High-Performance Concrete (UHPC) is an innovative material for such repairs because of its superior mechanical properties, strength, crack resistance, and durability. However, its high production cost, primarily due to using materials like silica fume and cement, is a significant drawback. This study explores the feasibility of incorporating fly ash and local materials into UHPCs to reduce costs while maintaining or improving their performance. As a supplementary cementitious material, fly ash enhances the compressive strength and workability of UHPC. The addition of limestone further supports early-age strength and workability. By evaluating the mechanical properties and workability of modified UHPCs, this research demonstrates the economic viability and environmental benefits of structural repairs. The results indicate that this modification can effectively enhance the early-age strength of UHPC, making it suitable for use as a repair material. The evaluation of the mechanical properties and workability of the modified UHPC suggests that these alternative materials can maintain or even improve the performance of UHPC. Thus, this approach offers a more economically viable and environmentally friendly solution for structural repairs.
Rheology Analysis of 3D Printed Geopolymer Based on High Calcium Fly Ash Yuyun Tajunnisa; Ridho Bayuaji; Rifqi Nadhif Arrafid; Hendro Nurhadi
IPTEK The Journal of Engineering Vol. 10 No. 3 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v10i3.a21071

Abstract

The advancement of 3D concrete printing has focused on automation research in recent decades. 3D printing technology is adequate to reduce waste and improve efficiency for construction. Former research on 3D concrete printing used hydration cement based on ordinary Portland cement (OPC), which was not environmentally friendly. An alternative material to overcome problems with hydrated cement mortar is a geopolymer. Geopolymer mortar based on 3D printing is still in its infancy. Mechanical and rheological properties are the key parameters of this technology: yield stress, shear stress, and viscosity. The flow characteristics of 3D concrete printing represented the ability of material transfer along the system of the 3D printing machine. This research utilizes type C fly ash waste as the primary material for making geopolymer 3D-printed concrete. Variations of 8, 10, and 12 M of NaOH concentration were used to investigate the relationship between workability and quality of the geopolymer mortar. Workability testing of 3D concrete printing consists of several parameters: pumpability, extrudability, and buildability. Material identification, including rheology and flowability, is carried out to determine mortar specimens' pumpability, extrudability, and buildability. Several test approaches, such as slump flow, slump, shape retention, and rheometer tests using the vane shear approach method, were conducted to identify the rheological characteristics and flowability of the material. Based on testing of the material's workability, 10 M NaOH concentration variation is the most suitable material for future 3D printing material. The workability of 10 M NaOH is 177.5 mm and the the copressive strength is 25.84 Mpa. This variation meet ACI 318/318R – 14 criterion for building structure.
Compressive Strength Performance of High-Volume Fly Ash Concrete with CaCO3 Addition Yosi Noviari Wibowo; Tatas; Yuyun Tajunnisa; Amalia Firdaus Mawardi; Miftaqul Zanah
IPTEK The Journal of Engineering Vol. 11 No. 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v11i1.a22092

Abstract

This study investigates the compressive strength performance of High-Volume Fly Ash (HVFA) concrete with added CaCO3 as a sustainable alternative to Ordinary Portland Cement (OPC) for infrastructure applications. The experimental research replaces a significant portion of cement with fly ash—a byproduct of coal combustion—aiming to reduce greenhouse gas emissions associated with concrete production. Two HVFA concrete mixtures were developed, substituting 37 percent and 47 percent of cement content with fly ash and adding 3 percent CaCO3 to enhance mechanical properties. Material characterization, including XRF and XRD analysis, confirmed the suitability of fly ash for concrete production based on ASTM C618-19 standards. Aggregate gradation, moisture content, and specific gravity tests were conducted to optimize the mix design. Compressive strength tests were performed at 7, 14, and 28 days, showing that HVFA concrete with 37 percent fly ash substitution achieved higher strength values, reaching 25.92 megapascals at 28 days, compared to the 47 percent mix, which reached 24.68 megapascals. Slump tests indicated sufficient workability, with a measured slump of 10 centimeters for FA37C3 and 12 centimeters for FA47C3. These findings suggest that HVFA concrete with moderate fly ash substitution, complemented by CaCO3 addition, can achieve compressive strength and workability comparable to OPC, supporting the development of environmentally friendly concrete solutions.
Pengembangan Desain Perbaikan dan Perkuatan Struktur Graving Dock Kapasitas 500 DWT di Pelabuhan Tanjung Emas Semarang R. Buyung Anugrah Affandhie; Yuyun Tajunnisa; Muhammad Sigit Darmawan; Nur Achmad Husin; Ridho Bayuaji; Ibnu Pudji Rahardjo; Sungkono Sungkono; Suwandi Suwandi; Kohar Yudoprasetyo; Moh. Safi’i Mansur
Sewagati Vol 9 No 4 (2025)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v9i4.210

Abstract

Graving Dock adalah sebuah tempat untuk membangun atau memperbaiki kapal. Struktur graving dock pada umumnya terdiri dari struktur dinding beton dan struktur pelat lantai beton. Struktur graving dock yang ditinjau saat ini sering mengalami kerusakan pada struktur pelat dan struktur dindingnya. Kerusakan yang terjadi pada pelat lantai dapat disebabkan karena umur dan material bangunan yang sudah lebih dari 50 tahun, sedangkan pada dinding graving dock dapat disebabkan karena terbuat dari pasangan bata yang ditunjang sloof yang berada di atas fondasi batu kali tetapi tidak menjadi satu kesatuan dengan fondasi tersebut. Hal itu berpotensi menyebabkan kerusakan berat dan dapat mengganggu aktivitas perbaikan kapal di graving dock. Untuk menghindari kerusakan berat, pada pengabdian masyarakat ini dilakukan perbaikan dan perkuatan pada struktur pelat lantai dan dinding graving dock. Langkah awal yang dilakukan adalah survei pendahuluan bertujuan untuk memperoleh data kondisi saat ini. Selanjutnya dilakukan analisis dan evaluasi terhadap struktur graving dock yang ada saat ini. Langkah terakhir yang dilakukan adalah desain perbaikan graving dock. Hasil desain perbaikan, didapatkan dimensi dan penulangan yaitu struktur dinding tebal 30 cm dengan tulangan D16-150, struktur dinding miring tebal 50 cm dengan tulangan D19-150, pelat lantai tengah tebal 60 cm dengan tulangan D19-150, dan pelat lantai tepi tebal 45 cm dengan tulangan D19-150.
Cyclic Behavior of Slender Shear Walls with Ultra High Performance Fiber Reinforcement Concrete Overlays Geralda Nurry Arifa; Aniendhita Rizki Amalia; Yuyun Tajunnisa
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 2 (2025): EDISI SEPTEMBER 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i2.8126

Abstract

Shear walls serve as the primary structural elements for resisting lateral loads induced by earthquakes; however, slender shear walls remain susceptible to shear failure and buckling, particularly in structures designed according to older design codes. One strengthening technique that has gained increasing attention is the application of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) overlays, which offer high strength and effective crack control capabilities. This study aims to analyze the cyclic behavior of slender shear walls strengthened with a two-layer UHPFRC overlay with a total thickness of 40 mm using a finite element method based on the Concrete Damage Plasticity (CDP) model implemented in Abaqus. The numerical model is validated using experimental data from conventional reinforced concrete shear walls and UHPFRC-strengthened shear walls by comparing force–displacement responses, hysteresis curves, and tensile damage (Damage) distributions. The validation results indicate that the numerical model accurately captures the structural response, as evidenced by the close agreement in maximum displacement and damage mechanisms, with displacement differences of 2.97% for the conventional shear wall and 0.18% for the UHPFRC-strengthened shear wall. Parametric analysis shows that the UHPFRC overlay significantly increases the maximum load capacity from 328.22 kN to 525.37 kN, enhances the initial stiffness and first-yield capacity, and reduces the maximum displacement from 127.79 mm to 112.50 mm. Furthermore, the UHPFRC-strengthened shear wall exhibits a more stable post-peak response, fuller hysteresis loops, higher energy dissipation capacity, and more localized and gradually developing tensile damage compared to the conventional shear wall. These results demonstrate that a 40 mm-thick two-layer UHPFRC overlay effectively improves the shear capacity, cyclic stability, and seismic resistance of slender shear walls.
Pemanfaatan Limbah Fly Ash Sebagai Substitusi Semen pada Beton HVFA untuk Konstruksi Instalasi Pengolahan Air Limbah (IPAL) Asyhadi Adnin Istimrori; Luqman Cahyono; Wiwik Dwi Pratiwi; Yuyun Tajunnisa
Conference Proceeding on Waste Treatment Technology Vol. 7 No. 1 (2024): Conference Proceeding on Waste Treatment Technology
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pemanfaatan batubara menimbulkan dampak yang signifikan terhadap peningkatan timbulan limbah fly ash. Limbah Fly ash berpotensi dimanfaatkan sebagai substitusi semen karena material ini memiliki sifat sementius yang mirip dengan semen dan memiliki sifat pozzolanik. Substitusi semen dengan fly ash dalam jumlah lebih dari 50% dapat dilakukan dengan teknologi beton High Volume Fly Ash (HVFA). Perkembangan beton HVFA di Indonesia masih pada konsumen yang terbatas sehingga penelitian ini bertujuan untuk penerapan pada konstruksi bangunan Instalasi Pengolahan Air Limbah (IPAL). Penelitian ini menggunakan metode eksperimental dengan sampel beton dilakukan pengujian kelayakan teknis terhadap kuat tekan yang mengacu pada ACI 350M-06. Hasil penelitian menunjukkan komposisi beton HVFA dengan substitusi semen menggunakan 47% limbah fly ash dan CaCO3 sebanyak 3% menghasilkan kuat tekan sebesar 32,82 MPa pada usia beton 28 hari. Berdasarkan hasil tersebut, limbah fly ash terbukti layak teknis sebagai substitusi semen pada beton HVFA untuk konstruksi bangunan Instalasi Pengolahan Air Limbah (IPAL).
Co-Authors Affandhie, R. Buyung Anugraha Affandhie, Raden Buyung Anugraha Ahmad Daffa Azmi Alam, Rizki Robbi Rahman Alfayet, Muhamad Rifki Alva Yuventus Lukas Amalia Firdaus Mawardi Andri Kusbiantoro Aniendhita Rizki Amalia Apsari, Auliagitta K. Apsari, Auliagitta Kumala Arrafid, Rifqi Nadhif Arwinda Aribah Cahyani Arwinda Aribah Cahyani Ashara, Khansa Fadilah Asyhadi Adnin Istimrori Auliagitta Kumala Apsari Auliagitta Kumala Apsari Bambang Piscesa Bayuaji, Ridho Bayuaji, Ridho Beta Rahayuning Pratiwi Beta Rahayuning Pratiwi Budi Suswanto Butje Alfonsius Louk Fanggi Cahyani, Arwinda Aribah Cahyani, Arwinda Aribah Chadaffi, Muchamad Daffa Azmi, Ahmad Data Iranata Dicky Imam Wahyudi Dicky Imam Wahyudi Dicky Imam Wahyudi Dicky Imam Wahyudi Dinar, Bala Arizalu Putra Diputra, Aditya Tamateja Djoko Sulistiono Fadilah Ashara, Khansa Fikri Ghifari Fikri Ghifari Galih Syifa’ul Ummah Geralda Nurry Arifa Geralda Nurry Arifa Habibillah Asyari, Yudhistira Habieb, Ahmad Basshofi Halisah, Vonny Nur Hariyanto, Ifarrel Rachmanda Hazen Masrafat Hendro Nurhadi Hendro Nurhadi Husin, Nur Achmad Husin, Nur Ahmad Husin, Nur Ahmad Ibnu Pudji Rahardjo Ibnu Pudji Rahardjo Ibnu Pudji Raharjo Indra Komara Indra Komara Indra Komara, Indra Joko Suparmanto Jonatan Lassa Jonatan Lassa Jusuf Wilson Meynerd Rafael Jusuf Wilson Meynerd Rafael Khansa Fadilah Ashara Khansa Fadilah Ashara Kharisma Keysia Paramitha Khoiri, Mohamad Kohar Yudoprasetyo Kuntjoro Kusbiantoro, Andri Louk Fanggi, Butje Alfonsius Luqman Cahyono M. Faishal Darmawan M. Faishal Darmawan M. Sigit Darmawan Machsus Machsus Mansur, Moh Safii MANSUR, MOH. SAFI'I Masiran, Hidajat Sugihardjo Mawardi, Amalia Firdaus Melati Tabita Kirana Thei Meynerd Rafael, Jusuf Wilson Miftaqul Zanah Mitsuhiro Shigeishi Mitsuhiro Shigeishi Moch.Ahdian Wildan Nafi Mochammad Ahdian Wildan Nafi Moh. Safi’i Mansur Moh. Safi’i Mansur Mohamad Khoiri Muhammad Hafiizh Imaaduddiin Muhammad Sigit Darmawan Muhammad Sigit Darmawan Muhammad Sigit Darmawan Muhammad Wildan Aziz Muhammad Wildan Aziz Niakku Immanuel Maggang Nur Achmad Husin Nur Achmad Husin Nur Achmad Husin Nur Achmad Husin Nur Ahmad Husin Nur Ahmad Husin Nurfain, Irfan Nurhadi, Hendro Paramitha, Kharisma Keysia Paramitha, Kharisma Keysia Piscesa, Bambang Piscesa, Bambang Pratiwi, Wiwik Dwi Priyo Suprobo Priyo Suprobo Purnamasari, Ragil R. Buyung Anugrah Affandhie R. Buyung Anugraha Affandhie R. Buyung Anugraha Affandhie Raden Buyung Anugraha Raden Buyung Anugraha Affandi Raden Buyung Darmawan Ralindra, Deris Faisa Ramadhaniawan, Virdy Ridho Bayuaji Ridho Bayuaji Rifqi Nadhif Arrafid Rijiyawanto, Adetya Shigeishi, Mitsuhiro Shoifah, Umi Arifatus Sigit Darmawan Sigit Darmawan Sigit Darmawan Siswahyudianto Sita Auliyah Rahmasari Sita Auliyah Rahmasari Siti Kamilia Aziz Srie Subekti Subekti, Srie Sulchan Arifin Sulchan Arifin Sungkono Sungkono Karsidi Sungkono Karsidi Sungkono Sungkono Sungkono Sungkono Suprobo, Priyo Sutrisno, Wahyuniarsih Sutrisno, Wahyuniarsih Suwandi Suwandi Suwandi Suwandi Suwandi Suwandi Syifaul Ummah, Galih Tatas Tatas, Tatas Tatas, Tatas Umi Arifatus Shoifah Ummah, Galih Syifa’ul Wahyuniarsih Sutrisno Wibowo, Yosi Noviari Wibowo, Yosi Noviari Wilujeng, Susi A Wiwik Dwi Pratiwi Wiwik Dwi Pratiwi Yanisfa Septiarsilia Yosi Noviari Wibowo Yosi Noviari Wibowo Yudoprasetyo, Kohar Zanah, Miftaqul