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http://dx.doi.org/10.5762/KAIS.2021.22.5.81

Effect of Loading Rate on Self-stress Sensing Capacity of the Smart UHPC  

Lee, Seon Yeol (Department of Civil and Environmental Engineering, Sejong University)
Kim, Min Kyoung (Department of Civil and Environmental Engineering, Sejong University)
Kim, Dong Joo (Department of Civil and Environmental Engineering, Sejong University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.22, no.5, 2021 , pp. 81-88 More about this Journal
Abstract
Structural health monitoring (SHM) systems have attracted considerable interest owing to the frequent earthquakes over the last decade. Smart concrete is a technology that can analyze the state of structures based on their electro-mechanical behavior. On the other hand, most research on the self-sensing response of smart concrete generally investigated the electro-mechanical behavior of smart concrete under a static loading rate, even though the loading rate under an earthquake would be much faster than the static rate. Thus, this study evaluated the electro-mechanical behavior of smart ultra-high-performance concrete (S-UHPC) at three different loading rates (1, 4, and 8 mm/min) using a Universal Testing Machine (UTM). The stress-sensitive coefficient (SC) at the maximum compressive strength of S-UHPC was -0.140 %/MPa based on a loading rate of 1 mm/min but decreased by 42.8% and 72.7% as the loading rate was increased to 4 and 8 mm/min, respectively. Although the sensing capability of S-UHPC decreased with increased load speed due to the reduced deformation of conductive materials and increased microcrack, it was available for SHM systems for earthquake detection in structures.
Keywords
Earthquakes; Self-stress Sensing; Ultra-High-Performance-Concrete (UHPC); Loading Rate; Steel Slag Fine Aggregate (SSFA); Steel Fiber;
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