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All Journal IPTEK The Journal of Engineering Journal of Civil Engineering
Yosi Noviari Wibowo
Institut teknologi sepuluh nopember
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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NUMERICAL INVESTIGATION OF GEOPOLYMER REINFORCED CONCRETE BEAMS UNDER FLEXURAL LOADING USING 3DNLFEA Yosi Noviari Wibowo; Bambang Piscesa; Yuyun Tajunnisa
Journal of Civil Engineering Vol 37, No 1 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v37i1.12095

Abstract

The development of geopolymer concrete is one of the most significant breakthroughs to replace the OPC concrete causing global warming issues. Investigations on the structural behavior of geopolymer concrete are limited and still need adjustments in numerical simulations to experimental results in previous studies. This study investigated the flexural behavior of geopolymer concrete as a structural member using the numerical method. The utilization of the finite element method is an alternative to widely determining the structural behavior of geopolymer concrete as a construction material. In this study, the author refers to the research conducted by Pham et al. The research developed a four-point bending test with variations in tensile steel reinforcement ratio. The results of the experimental tests that Pham has carried out will be verified by numerical simulation in three dimensions. The validation of experimental specimens with numerical specimens is done to compare the moment-curvature and the crack pattern of concrete. Numerical investigation accurately captures the structural behavior of moment-curvature and crack pattern of geopolymer concrete. The moment maximum deviation between experimental and numerical results is 1.3 to 2.4%. However, there are differences in the number and length of cracks in the bending moment area. The difference of crack pattern in the bending moment area between experimental results and numerical results due to the modeling did not consider the input of fracture energy. The experiment from referenced studies did not include fracture energy data, so the 3DNLFEA modeling used the fracture energy value of OPC concrete.
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.
Co-Authors Amalia Firdaus Mawardi Bambang Piscesa Miftaqul Zanah Tatas Yuyun Tajunnisa