Green Material in Civil Engineering, Geopolymer Concrete
62
Scopus Publications
Scopus Publications
Early-Stage Prediction of Steel Weight in Industrial Buildings Using Neural Networks Johnny Setiawan, Ridho Bayuaji, Mohammad Arif Rohman, Delima Canny Valentine Simarmata Symmetry, 2025 In industrial building projects, steel is the main material used to create sturdy structures that have large open spaces without many columns in the center of the building. To estimate the cost of constructing a building before it enters the detailed design stage, engineers and stakeholders must have the right tools and guidelines. Steel is an important construction material used at high volumes in industrial buildings, and it plays a significant role in determining the total cost of a project. This study develops and evaluates an artificial neural network (ANN) model based on multilayer perceptron (MLP) to predict the weight of steel structures in industrial buildings. The data collected include actual projects from 180 industrial building projects, using parameters that influence the weight of steel. The findings show that the ANN method can accurately estimate the weight of steel at an early stage in the building project, even before the detailed design phase. It was found that ANN has the ability to predict the weight of steel for industrial buildings with an excellent degree of accuracy, with a coefficient of correlation (R2) of 94.85% and prediction accuracy (PA) of 94.23%. This indicates that the relationship between the independent and dependent variables of the developed models is good and the predicted values from the forecast model fit with the real-life data.
Development of A Parametric Cost Estimation Model for Landfill Construction Projects Nurhayati Junaedi, Ridho Bayuaji, Alfred Jonathan Susilo Advance Sustainable Science Engineering and Technology, 2025 Indonesia’s waste management system is still dominated by the collect–transport–dispose approach, making landfills crucial for environmental sustainability. Landfill construction is a complex process requiring accurate cost estimation to prevent overruns and delays. This study develops a landfill construction cost estimation model using the Cost Significant Model (CSM) approach. Data were obtained from landfill project budgets in Java, Indonesia (2013–2021) and analyzed using multiple linear regression in SPSS. Results show that landfill block, leachate treatment installation, and operational road are the most significant cost components, the estimation model is Y = 3698103502.04 + 1.301X3 + 0.371X4 + 1.236X5. The model falls within the class 4 cost estimation accuracy range according to AACE International standards, making it suitable for feasibility study use. This study introduces a model, context-specific cost estimation model for landfill projects in Indonesia, supporting effective planning and sustainable infrastructure development
The Impact of Longitudinal and Stirrups Reinforcement Ratio to Shear Strength Capacity of Geopolymer Concrete Beam Y. Tajunnisa, A.K. Apsari, R. Bayuaji, Moh. Safi’i Mansur Archives of Metallurgy and Materials, 2025 The shear capacity of reinforced beam concrete was designed to resist the stirrup reinforcement, Vs, and by the concrete itself, Vc. Previous studies of geopolymer concrete show the mechanical properties of this proposed green concrete, yet the structural investigation is infrequently investigated. These studies mostly observed the impact of using alternative binder resources that affect the workability, setting time, compressive strength, split tensile strength, and drying shrinkage. Therefore, this study aims to observe the structural behavior of geopolymer concrete, precisely its shear capacity. Four geopolymer concrete beam types were designed to have shear failure mode when tested using a Universal Testing Machine by four-point load bending method. The results showed that geopolymer concrete has ductile behavior. Comparison between the Vu value of the test results with Vn calculation of nominal cross-sectional capacity according to standard concrete rules in an average of 2.11 higher than the nominal capacity conventionally calculated according to SNI. Two models of linear regression equations for concrete Vc values were created to explore this further. It was found that the presence of a constant increases the value of the coefficient of determination by up to 29% for the Vc equation in geopolymer concrete. In addition, cracking patterns observed with the DIC method using GOM Correlate software also showed that all the beam specimens had failure both in flexure and shear, even though they all are designed in a shear failure state.
Advancements in Additive Manufacturing for 3D-printed Mortar-Based Concrete Houses: Technical Analysis for Large-Scale Construction Rifqi Nadhif Arrafid, Hendro Nurhadi, Yuyun Tajunnisa, Ridho Bayuaji, Wahyuniarsih Sutrisno 2023 International Conference on Advanced Mechatronics Intelligent Manufacture and Industrial Automation Icamimia 2023 Proceedings, 2023 The advent of 3D printing mortar technology heralds a transformative era in construction, offering a superior alternative to traditional methods in terms of efficiency, cost-effectiveness, and speed. This groundbreaking technology seamlessly integrates three-dimensional computer design, computer-aided design (CAD), rapid prototyping, and mechatronic components to enable the creation of structures through additive manufacturing. Additive manufacturing's layer-by-layer approach allows the precise realization of complex geometric designs. 3D mortar printing technology revolutionizes engineering practices by facilitating safer construction processes, reducing costs, and accelerating construction. The end products of 3D mortar printing exhibit exceptional precision, accuracy, and the capacity to realize intricate architectural designs. A significant milestone in developing 3D printing technology for construction was achieved by Behrokh Khosnevis in 2004 with the introduction of contour crafting (CC). As Indonesia experiences population growth and increased human capital, the demand for rapid construction solutions escalates. This paper conducts a technical analysis focused on the application of additive manufacturing to create 3D-printed concrete houses utilizing mortar-based materials. The analysis delves into civil engineering challenges tied to mortar research for 3D-printed concrete houses, encompassing aspects such as 3D mortar printing concepts, general mix designs, 3D printing machine architecture, and an array of testing procedures, including assessments of flowability, rheology, extrudability, and buildability. The laboratory-scale 3D printing machine employed in this study features a parallel manipulator with a gantry boasting three axes (X, Y, and Z). This prototype exhibits significant potential for scaling up to meet the requirements of large-scale construction projects. Ongoing enhancements to the machine encompass mechanical improvements, incorporating advanced sensor systems, optimization, and augmentations in machine capacity. In conclusion, this research endeavors to shed light on the technical intricacies of 3D mortar printing for construction applications, with a particular emphasis on mix design, machine development, and performance testing.
THE EFFECT OF ADMIXTURE VARIATIONS ON WORKABILITY AND COMPRESSIVE STRENGTH OF GEOPOLYMER CONCRETE FLY ASH BASED WITH HIGH CALCIUM CONTENT Boontarika Thongdonphum International Journal of Geomate, 2022 : This research investigates the sedimentation rate for the assessment of sediment accumulation in the cage culture area, Rangsit canal 13 in Thailand’s central province of Pathum Thani. Water and sediment qualitwasre conducted during September 2017 (rainy season) and March 2018 (dry season). The temperatures, dissolved oxygen, and pH ranged between 30.5-31.5 O C, 5.54-7.78 mg L -1 , and 7.7-8.1, respectively. The results revealed that the dissolved oxygen varied from season to season (p ≤ 0.05). The results indicated that the water qualities varied in response to the seasonal variability and were alarmingly higher than Thailand’s minimum threshold for aquaculture. In terms of sediment qualities, variations in water content, total organic matter, and sedimentation rate ranged between 37.4-62.4%, 67.6-97.6 mg g-dry weight -1 , and 438.8-3,768.8 g m -2 day -1 , respectively. The results revealed that water content and total organic matter had no different significance (p>0.05) while sedimentation rates varied significantly (p ≤ 0.05) with seasons. Such levels of total organic matter and sedimentation rate were high in the area, especially in the rainy season. The finding also showed that mass transfer and water inflow in the area, especially in the rainy season, influenced the sediment output in the water system, indicating the adequate sediment input-output balance. The water mass transfer will require consideration for the assessment of sediment accumulation and water resource management in the study area.
Thermal energy storage optimization in shopping center buildings Department of Engineering Physics, FTI, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia, Totok R. Biyanto, Akhmad F. Alhikami, Department of Engineering Physics, FTI, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia, Gunawan Nugroho, Department of Engineering Physics, FTI, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia, Ridho Hantoro, Department of Engineering Physics, FTI, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia, Ridho Bayuaji, Department of Civil Engineering, FTSP, Institut Teknologi Sepuluh Nopember, Kampus ITS Manyar, Surabaya 60118, Indonesia, Hudiyo Firmanto, Department of Mechanical Engineering, FT, Universitas Surabaya, Jl. Raya Kalirungkut, Tenggilis, Surabaya 60293, Indonesia, Joko Waluyo, Department of Mechanical Engineering, FT, Universitas Gajah Mada, Bulaksumur Yogyakarta 55281, Indonesia, Agus Imam Sonhaji, Badan Perencanaan Pembangunan Kota Surabaya, Jalan Pacar No. 8, Surabaya 60272, Indonesia Journal of Engineering and Technological Sciences, 2015
