Experimental Study on Dynamic Performance of Plain Concrete and Lightweight Aggregate Concrete under Uniaxial Loading

Yu, Zhenkun; Tang, Rui; Liu, Guoqing; Guo, Zhaoyuan; Huang, Qiao

doi:10.1061/(asce)mt.1943-5533.0003846

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…From point B to point C, the stress on the specimen gradually decreases while deformation continues to increase, which is manifested by an increasing number and widening of cracks until the ultimate failure occurs. The failure process of LWAC in this study was characterized by cracks in the aggregate, leading to shear failure and subsequent overall failure, which is similar to the description of the dynamic failure mode of LWAC in the literature (Yu et al 2021b).…”

Section: Impact Compression Failure Processsupporting

confidence: 75%

“…At the microscale, concrete is typically regarded as a three-phase composite material composed of aggregate, mortar matrix, and interface transition zone (ITZ) phases. The random aggregate model constructed on this basis has been applied by domestic and foreign scholars in quasi-static and dynamic numerical simulations and has achieved significant research results (Xu et al 2012;Huang et al 2016;Jin et al 2020;Yu et al 2021b;Wu et al 2020a). This study used a random aggregate model, and numerical simulation research was conducted on the dynamic mechanical properties of LWAC at low temperatures (−30°C, −20°C).…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Impact Compression Failure and Dynamic Mechanical Behavior of Lightweight Aggregate Concrete at Low Temperatures

Duan,

Zhu,

et al. 2023

ACT

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Lightweight aggregate concrete (LWAC) is often used in building structures in these cold regions, which may also bear impact loads. To investigate the dynamic mechanical behavior of LWAC at low temperatures, this study conducted numerical simulations of the split Hopkinson pressure bar impact experiment on LWAC at room and low temperatures. The numerical simulation results showed good agreement with the experimental results, and on this basis, the dynamic failure process and characteristics of LWAC at different temperatures were analyzed. The numerical simulation results showed that both strain rates and temperatures have significant effects on the dynamic failure behavior of LWAC, and as the strain rate increases, more cracks are produced in LWAC during failure; as the temperature decreases, more cracks appear in the mortar matrix owing to the gradual decrease in the strength difference between the mortar matrix and the aggregate phase. In addition, both decreasing the temperature and increasing the strain rate enhance the strength of LWAC; a low temperature enhances the impact toughness of concrete at 60 s -1 and 80 s -1 but weakens it at 100 s -1 . This study can be used as a theoretical reference for the safety and protection design of LWAC in low-temperature environments.

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Section: Impact Compression Failure Processsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Impact Compression Failure and Dynamic Mechanical Behavior of Lightweight Aggregate Concrete at Low Temperatures

Duan,

Zhu,

et al. 2023

ACT

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“…By referencing the experiment plan in the relevant literature 21,22 and considering the limitations of the experiment equipment, cylindrical specimens were used for the axial compression test and axial tension test (dimension: φ 75 mm Â 160 mm), and cubic specimens were sued for the direct shear test (dimension: 100 mm Â 100 mm Â 100 mm).…”

Section: Specimen Preparationmentioning

confidence: 99%

Experimental study and mechanism analysis on basic mechanical properties of basalt fiber reinforced concrete

Wei

Sun

et al. 2022

Structural Concrete

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In order to comprehensively examine the influence of basalt fiber on the basic mechanical properties of concrete, the axial compression, axial tension and direct shear tests were carried out on basalt fiber reinforced concrete (BFRC) with different fiber contents and fiber lengths. The failure modes and stress–strain curves under different loading modes were obtained from the test data, and the basic mechanical parameters of BFRC were extracted from the curves. Based on the results, the following conclusions were drawn. With the increase of fiber content, both the compressive strength and tensile strength showed an upward trend first followed by a downward trend. In general, the shear strength of BFRC was lower than that of ordinary reinforced concrete with no fiber (RC). All BFRC specimens had an increased peak strain and significantly improved deformability compared to RC. Based on a comprehensive analysis, the specimen with a fiber content of 0.2% and a fiber length of 6 mm (BFRC‐0.2%‐6) exhibited the best mechanical properties. In addition, mathematical regression analysis was performed on the normalized stress–strain curves of BFRC, and the influencing parameters model of basalt fiber was proposed based on the fiber content and fiber length. Moreover, scanning electron microscopy (SEM) and computed tomography were utilized to analyze the influencing mechanism of basalt fiber content and fiber length on the mechanical properties of concrete from the microcosmic and mesoscopic perspectives.

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“…When the temperature is 800 • C, the compressive stress is increased from 9.77 MPa at the static strain rate of 10 −5 /s to 10.98 MPa at the strain rate of 10 −2 /s, indicating an increase by 7.78% due to the strain rate. In the relevant literature [30,31], the mechanical properties of ordinary concrete under low to medium strain rates (10 −5 /s~10 −2 /s) under compressive stress have been investigated. Compared with static conditions, the compressive stress is generally increased by 30% to 40% by the strain rate.…”

Section: Peak Stressmentioning

confidence: 99%

Research on Dynamic Compressive Performance and Failure Mechanism Analysis of Concrete after High Temperature and Rapid Cooling

et al. 2022

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To investigate the dynamic compressive properties of concrete after high temperature and rapid cooling, an experimental study was carried out by considering five temperatures and four strain rates. The coupling effect of high temperature and strain rate on concrete damage morphology and mechanical parameters was comparatively analyzed. The main conclusions are as follows: the compressive damage morphology of concrete is affected by strain rate development trends of significant variability under different temperature conditions. As the strain rate increases, the compressive stress and elastic modulus of concrete are gradually increased. As the temperature increases, the increase in compressive stress is gradually reduced by the strain rate. For the temperatures of 20 °C and 800 °C, the increase in compressive stress by the strain rate is 38.69% and 7.78%, respectively. Meanwhile, SEM and CT scanning technology were applied to examine the mechanism of the effect of high temperature and strain rate on the mechanical properties of concrete from the microscopic perspective, and the corresponding constitutive model was proposed.

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Experimental Study on Dynamic Performance of Plain Concrete and Lightweight Aggregate Concrete under Uniaxial Loading

Cited by 10 publications

References 26 publications

Numerical Analysis of Impact Compression Failure and Dynamic Mechanical Behavior of Lightweight Aggregate Concrete at Low Temperatures

Numerical Analysis of Impact Compression Failure and Dynamic Mechanical Behavior of Lightweight Aggregate Concrete at Low Temperatures

Experimental study and mechanism analysis on basic mechanical properties of basalt fiber reinforced concrete

Research on Dynamic Compressive Performance and Failure Mechanism Analysis of Concrete after High Temperature and Rapid Cooling

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