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Iman Satyarno
Gadjah Mada University
Civil Engineering, Building, Construction & Architecture

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Utilization of Steel Aggregate and Iron Sand as Heavyweight Concrete for Gamma Radiation Shielding Habib Abdurrahman; Iman Satyarno; Agus Budhie Wijatna
Civil Engineering Dimension Vol. 27 No. 1 (2025): MARCH 2025
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.27.1.85-94

Abstract

This study aims to produce a homogenous and workable conventional heavyweight concrete (HWC) with similar performance as pre-placed HWC in attenuating radiation by increasing the concrete density with no risk of segregation. HWC was mixed using steel aggregate and iron sand with a specific gravity of 7.78 and 4.14, respectively. A w/c ratio of 0.5 was applied to obtain proper workability and viscosity modifying agent (VMA) was used to prevent segregation. The radiation tests were carried out using 133Ba (356 keV), 137Cs (662 keV), and 60Co (1170 keV & 1330 keV) gamma sources. The results obtained a concrete density of 5133.07 kg/m3 with no sign of segregation and a compressive strength of 18.61 MPa. Based on the radiation test, the conventional HWC was effective in reducing the shielding thickness by 50.41%. Our findings provide a workable conventional HWC with high gamma attenuation to replace an enormous dimension of normal concrete.
Effectiveness of Elastomeric Bearings in Reducing Pounding Effects between Reinforced Concrete Buildings under Seismic Condition M. Riski Audri Rahman; Ashar Saputra; Iman Satyarno
Civil Engineering Dimension Vol. 27 No. 1 (2025): MARCH 2025
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.27.1.47-58

Abstract

This study investigates seismic pounding hazards between adjacent reinforced concrete buildings in East Java, particularly those designed under older regulations without pounding considerations. Nonlinear time history analysis was performed on three building models using eleven pairs of earthquake records scaled to SNI 8899:2020, representing Megathrust, Benioff, and Shallow Crustal earthquakes, with only three pairs analyzed in this study. Model 1 allowed free movement, Model 2 included concrete impact links with a 50 mm gap, and Model 3 utilized elastomer bearing links with a 9 mm gap. Results showed that elastomeric bearings reduced pounding forces by 81% to 95%, decreasing link force from 57437 kN to 5745 kN while withstanding axial loads up to 6276 kN, preventing collisions and maintaining structural stability. Additionally, Model 3 exhibited reduced floor accelerations and structural damage compared to Model 2, emphasizing the importance of elastomeric bearings in mitigating seismic pounding risks.
Co-Authors Agus Budhie Wijatna Ashar Saputra Habib Abdurrahman M. Riski Audri Rahman