Abstract
Understanding the dynamic behavior of Lightweight Aggregate Self-Compacting Concrete (LWASCC) is of importance to the safety of concrete structures serving in dynamic loading conditions. In this study, the fundamental dynamic properties of LWASCC with three types of LWA were investigated by the impact resonance method. Results show that the dynamic elastic and shear modulus generally decrease with the increase of LWA volume fraction, whereas three types of LWA exert limited influence on dynamic Poisson’s ratio. The dynamic elastic and shear modulus show good linear dependence upon compressive strength. The inclusion of three types of LWA significantly increases the damping ratio, indicating significantly enhanced damping capacity of LWASCC under dynamic loading conditions. The damping ratio of LWASCC is improved by 2.0%, 4.4%, and 2.9% when adding 1% (by volume) expanded clay, rubber, and expanded polystyrene, respectively. The compressive strength and dynamic performances of LWASCC are highly influenced by the intrinsic properties (elastic modulus, damping capacity, wettability, etc.) and geometrical characteristics (size, surface roughness, etc.) of LWA, as well as the LWA-matrix bonding capacity.
Highlights
Self-compacting concrete (SCC) is a special type of highperformance concrete developed over the last few decades, which consolidates under its own weight instead of mechanical vibration and has excellent flowability, segregation resistance, filling, and passing ability in the fresh state [1].ese advantages enable SCC to be successfully used in confined areas and densely reinforcement elements [2,3,4]
Understanding the dynamic properties of concrete can significantly improve the structural reliability when subjected to dynamic loads. erefore, in this study, the fundamental dynamic characteristics of lightweight aggregate self-compacting concrete (LWASCC) with three typical types of lightweight aggregate (LWA) at incremental volume percentages were comparatively investigated by the impact resonance method. e objective of this study is to help understand the dynamic behavior of LWASCC, develop LWASCC with anticipated dynamic properties, and facilitate its potential applications
As suggested by ASTM C 1621 [32], fresh LWASCC with a difference value of 0–25 mm can be classified as “no visible blocking.” is indicates that the addition of Expanded clay (EC) improves the workability of LWASCC in terms of both flowability and passing ability, whereas, for R and expanded polystyrene (EPS), opposite tendencies were observed. e inclusion of R and EPS leads to a remarkable reduction in flowability of LWASCC, as shown in Figures 4(a) and 4(b)
Summary
Self-compacting concrete (SCC) is a special type of highperformance concrete developed over the last few decades, which consolidates under its own weight instead of mechanical vibration and has excellent flowability, segregation resistance, filling, and passing ability in the fresh state [1]. Ey attributed the greater strength loss of normal concrete to the poorly developed rubber-hardened cement paste interface induced by vibration in the preparing process. Zheng et al [24] investigated the dynamic properties of rubberized concrete using a free vibration method and observed that the damping ratios of rubberized concrete improved considerably compared to those of normal concrete. Long et al [26] further investigated the dynamic mechanical properties of steam-cured concrete and observed enhanced damping ratio when expanded clay ceramsite or ceramsite sand was incorporated. Erefore, in this study, the fundamental dynamic characteristics of LWASCC with three typical types of LWA at incremental volume percentages were comparatively investigated by the impact resonance method. Understanding the dynamic properties of concrete can significantly improve the structural reliability when subjected to dynamic loads. erefore, in this study, the fundamental dynamic characteristics of LWASCC with three typical types of LWA at incremental volume percentages were comparatively investigated by the impact resonance method. e objective of this study is to help understand the dynamic behavior of LWASCC, develop LWASCC with anticipated dynamic properties, and facilitate its potential applications
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