Assessment of bond-slip behavior of hybrid fiber reinforced engineered cementitious composites (ECC) and deformed rebar via AE monitoring

Shan, Wenchen; Liu, Jiepeng; Ding, Yao; Mao, Weihao; Jiao, Yanpeng

doi:10.1016/j.cemconcomp.2021.103961

Cited by 45 publications

(12 citation statements)

References 36 publications

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“…Figure 2 demonstrates the compression stress versus strain behavior for ECC specimens with different fiber types. The outcomes of the compression test reveal that using a hybrid combination of PP and PVA fibers helped to significantly increase the failure strain of ECC specimens compared to the mono fiber ones [ 28 ]. ECC specimens with hybrid fibers had a mean cylinder compression strength of 24.3 N/mm 2 and a large failure strain of 0.008.…”

Section: Resultsmentioning

confidence: 99%

Experimental and Numerical Investigation on the Shear Behavior of Engineered Cementitious Composite Beams with Hybrid Fibers

Maheswaran

Chellapandian²,

Sivasubramanian³

et al. 2022

Materials

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The shear behavior of innovative engineered cementitious composites (ECC) members with a hybrid mix of polyvinyl alcohol (PVA) and polypropylene (PP) fibers is examined. The overall objective of the investigation is to understand the shear behavior of ECC beams with different mono and hybrid fiber combinations without compromising the strength and ductility. Four different configurations of beams were prepared and tested, including 2.0% of PP fibers, 2.0% of PVA fibers, 2.0% of steel fibers and hybrid PVA and PP fibers (i.e., 1% PP and 1% PVA). In addition to the tests, a detailed nonlinear finite element (FE) analysis was accomplished using the commercial ABAQUS software. The validated FE model was used to perform an extensive parametric investigation to optimize the design parameters for the hybrid-fiber-reinforced ECC beams under shear. The results revealed that the use of hybrid PVA and PP fibers improved the performance by enhancing the overall strength and ductility compared to the steel and PP-fiber-based ECC beams. Incorporating hybrid fibers into ECC beams increased the critical shear crack angle, indicating the transition of a failure from a brittle diagonal tension to a ductile bending.

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Section: Resultsmentioning

confidence: 99%

Experimental and Numerical Investigation on the Shear Behavior of Engineered Cementitious Composite Beams with Hybrid Fibers

Maheswaran

Chellapandian²,

Sivasubramanian³

et al. 2022

Materials

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“…9 The HI and Sr are both calculated according to energy, and are effective parameters for evaluating the damage degree of the specimen. 12,42 The HI reflects the real-time variation of the AE signal, determined by Equation ( 5), and is able to record any sudden changes in the intensity of the accumulative AE signal. 42 HIðtÞ ¼…”

Section: Ae Signal Intensity Analysismentioning

confidence: 99%

“…AE technique is widely used in the detecting and identifying the deteriorations of various engineering materials, including concrete, 12 asphalt, 13 rock, 14 mortar, 15 etc. The research results indicate that AE signals are sensitive and effective for the generation, progression, and fracture of cracks in materials.…”

Section: Introductionmentioning

confidence: 99%

Damage evaluation and failure mechanism analysis of axially compressed circular concrete-filled steel tubular column via AE monitoring

Gao

Liu

Wang

et al. 2023

Structural Health Monitoring

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Concrete-filled steel tubular (CFST) columns are frequently used as the main load-bearing components in engineering structures due to their excellent load-bearing capacity. However, the presence of steel tube makes it impossible to accurately detect the damage characteristics of concrete by only relying on traditional mechanical measurement methods. This article quantitatively investigates the concrete damage of circular CFST column during axial compression based on the acoustic emission (AE) technique. Through the cumulative AE parameters including amplitude, count, and energy, the axial compression process of the CFST column can be divided into five main stages (Stage I is divided into two substages) to represent the different damage degree. The damage characteristics of concrete at each stage were explained by combining AE results and mechanical phenomena. A sensitivity analysis of the axial compression process was carried out using the Historic Index ( HI) and Severity ( Sr) and found that the sudden rise in HI and Sr corresponded to the changes in the different loading stages. The Improved b ( Ib) value analysis calculated from the AE amplitudes reflects the evolution mechanism of the crack and can be used for the identification of the final failure moment of the specimen. Finally, a new method for processing and analyzing AE parameters was proposed, which effectively enhanced the dimensionality of real-time monitoring information on the damage of concrete filled in the steel tube.

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“…The debonding of concrete and fiber bars is a main failure mode, and the response of AE activity is obviously related to the evolution of debonding damage 35 . The study of Shan et al 36 also proved that the debonding damage process can be classified according to the characteristic of AE activity. Recently, many studies on the damage of the concrete reinforced by various types of fiber have been conducted by the use of the AE technology 37–39 .…”

Section: Introductionmentioning

confidence: 98%

Visual damage identification of concrete cylinders with steel‐fiber‐reinforced composite bars based on acoustic emission

Guo

Chen

Tang

et al. 2021

Structural Contr & Hlth

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Steel-fiber-reinforced composite bar (SFCB) is a composite bar composed of a crescent-rib steel bar and an outer protruded fiber-reinforced polymer (FRP) layer. Due to its unique post-yield stiffness and superior anti-corrosion behavior, the SFCB is except to be an ideal reinforcement for concrete structures subject to a high corrosion environment. For SFCB-reinforced concrete cylinders, their internal damage mechanism has never been experimentally studied but was usually speculated with the brittle failure due to the potential brittle fracture of the SFCB. To reveal the compression damage mechanism of SFCBreinforced concrete cylinders, a uniaxial compression test for SFCB-reinforced concrete cylinders was carried out at first. The entire damage process of SFCBreinforced concrete cylinders was monitored in real-time by acoustic emission (AE), a widely used nondestructive testing method. The test result shows that the SFCB-reinforced concrete cylinders fail after the buckling of longitudinal SFCB or the fracture of the stirrup. The intensity signal analysis of AE proves the failure mode of the SFCB-reinforced concrete cylinder was close to a plastic failure instead of a brittle failure. Furthermore, a new damage visualization method is proposed to analyze the internal damage of the concrete cylinders by using the spatial b value of AE. The T value was constructed by combining the spatial b value with the density distribution of AE events. It is proven that the T value is highly sensitive to the serious damages of the concrete cylinders and can be used to identify the damage locations inside the concrete cylinders.acoustic emission, concrete cylinder, damage identification, steel-fiber-reinforced composite bar, uniaxial compression | INTRODUCTIONSteel-fiber-reinforced composite bar (SFCB) is a type of composite bar developed almost a decade ago. 1 It is composed of a crescent-rib steel bar and an outer protruded fiber-reinforced polymer (FRP) layer, as shown in Figure 1. SFCB has a good bonding property with concrete 2,3 and is excepted to be an ideal reinforcement for concrete structures subject to the high earthquake risk area or the high corrosion environment due to its unique post-yield stiffness and superior anti-corrosion behavior. 1,4,5

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Assessment of bond-slip behavior of hybrid fiber reinforced engineered cementitious composites (ECC) and deformed rebar via AE monitoring

Cited by 45 publications

References 36 publications

Experimental and Numerical Investigation on the Shear Behavior of Engineered Cementitious Composite Beams with Hybrid Fibers

Experimental and Numerical Investigation on the Shear Behavior of Engineered Cementitious Composite Beams with Hybrid Fibers

Damage evaluation and failure mechanism analysis of axially compressed circular concrete-filled steel tubular column via AE monitoring

Visual damage identification of concrete cylinders with steel‐fiber‐reinforced composite bars based on acoustic emission

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