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Compressive strengths of specimens subjected to steam curing and room temperature curing as a function of curing time.
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High-strength concrete (HSC) uses binders and microfillers with ultrafine particles, such as silica fume. The resulting dense internal hydration structure rapidly decreases HSC humidity, causing shrinkage cracks and affecting internal hydration. Herein, the hydration degree inside high-strength cement composites (HSCCs) was examined using waste gla...
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Citations
... Higher loading rates generally lead to an increase in apparent stiffness and can intensify microcracking, which in turn alters the material's ability to dissipate energy-often increasing it, although more experimental data is needed to establish definitive trends. The damage state of the concrete is another crucial factor: as microcracks propagate due to mechanisms like fatigue loading or freeze-thaw cycles, frictional (Coulomb-type) and sliding dissipative processes become more pronounced, leading to a corresponding rise in the damping ratio [76][77][78][79][80][81][82][83][84]. In general, the baseline damping ratio for undamaged concrete is relatively low-typically ranging from 0.1% to 2%-but this value can increase substantially, reaching several percent as internal damage accumulates. ...
Enhancing the damping capacity of concrete structures is crucial for improving their resilience under dynamic loading conditions such as earthquakes, vehicular impacts, and industrial vibrations. This study presents a comprehensive review of how material properties-specifically fiber reinforcement, ductility, and toughness-affect the damping behavior of concrete. Various types of fiber reinforcements, including steel, polypropylene, and glass fibers, are analyzed in terms of their contribution to energy dissipation mechanisms such as crack bridging, fiber pullout, and frictional sliding. The role of the ductility index and toughness in augmenting the damping ratio is also discussed, demonstrating that higher ductility and toughness directly correlate with enhanced energy dissipation. Furthermore, the interrelationships between material properties and structural performance under cyclic loading are critically evaluated. The findings highlight that optimizing fiber content and improving the mechanical properties of concrete can significantly increase its damping capacity, thereby offering strategic pathways for designing safer and more durable infrastructure, especially in seismic-prone regions. This review aims to consolidate the current understanding and provide recommendations for future research focused on developing high-damping concrete composites.
... The material's internal damping ratio comprises hysteretic, viscous, and Coulomb components [13,14]. Hysteretic damping stems from microstructural sliding friction [15,16], viscous damping results from the presence of moisture within the cement matrix [15,17,18], and the Coulomb component is due to friction between crack surfaces. Of these, Coulomb damping is the predominant mechanism influencing the concrete's internal damping ratio [4,13,14,19,20]. ...
This paper significantly extends investigations into internal damping ratios in both undamaged and damaged conditions for normal-strength concretes (NSCs) and high-strength concretes (HSCs). This study examines concretes with compressive strengths ranging from 42 to 83 MPa. Cyclic loads were applied using a servo-controlled hydraulic testing machine, and for each cyclic step, the dynamic elastic modulus (Ed) and internal damping ratio (ξ) were determined through acoustic tests. The results show that the normal-strength concretes (fc=42 MPa) exhibited an undamaged internal damping ratio of ξ=0.5%, reaching a maximum of ξ=2.5% at a damage index of 0.8. Conversely, the high-strength concrete mixtures (fc=83 MPa) showed an undamaged internal damping ratio of ξ=0.29%, with a peak value of ξ=0.93% at a damage index of 0.32. The initial internal damping values are influenced by porosity and transition zones, which affect the material behavior under cyclic loads. Progressive damage leads to increased Coulomb damping due the cracking process. Few studies have quantified and comprehended the internal damping ratio under cyclic loading-induced damage, and this research advances our understanding of NSC and HSC behavior under dynamic excitation and damage evolution, especially in impact scenarios.
