Experimental investigation on the mechanical behavior of polyvinyl alcohol fiber recycled aggregate concrete under triaxial compression

Chen, Yuliang; Li, Peize; Ye, Peihuan; Li, Hong; Liang, Xin

doi:10.1016/j.conbuildmat.2022.128825

Cited by 25 publications

(6 citation statements)

References 36 publications

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“…When the volume fraction of PVAF increases to 0.2% or 0.3%, the flexural tensile strength further increases to 58.33% and 47.92%, respectively, compared with the control prism (RAC100). PVAF has a good flexural strength and elastic modulus; thus, it can effectively improve the flexural strength of recycled concrete 51 . Moreover, adding SF to RAC results in a significant improvement in flexural tensile strength.…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…PVAF has a good flexural strength and elastic modulus; thus, it can effectively improve the flexural strength of recycled concrete. 51 Moreover, adding SF to RAC results in a significant improvement in flexural tensile strength. This is in good agreement with the findings of Carnerio et al 52 Owing to the cohesive effect between the SF and RCA, 43 adding an appropriate amount of SF can reduce the shrinkage of concrete, delay the failure fracture of RAC, and improve flexural strength.…”

Section: Flexural Tensile Strengthmentioning

confidence: 99%

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Effect of hybrid fibers on the flexural performance of high‐strength recycled aggregate concrete beams

Niu

Gao

et al. 2023

Structural Concrete

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Fibers are mixed within reinforced high‐strength recycled aggregate concrete (RHRAC) beams to improve their flexural performance. This study experimentally and analytically investigates the effect of using RAC combined with polyvinyl alcohol fiber (PVAF) and steel fiber (SF) on the flexural performance of RHRAC beams. A total of 11 RHRAC beams (150 × 300 × 2600 mm3) are manufactured and subject to four‐point flexural testing. The parameters of the concrete are investigated, including the volume content of the PVAF and SF. The experimental results show that SF increases the flexural strength of RHRAC beams more than PVAF does. Conversely, the effect of PVAF on deformability is more significant than that of SF. In addition, the positive influences of hybrid fiber (PVAF and SF) on the crack load, flexural capacity, and deformation capacity are superior to those of single‐mixed PVAF or SF. Three different specifications are used to calculate the flexural capacity of the test beams, among which, JGJ/T465‐2019 is the most reliable.

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Section: Test Results and Discussionmentioning

confidence: 99%

Section: Flexural Tensile Strengthmentioning

confidence: 99%

Effect of hybrid fibers on the flexural performance of high‐strength recycled aggregate concrete beams

Niu

Gao

et al. 2023

Structural Concrete

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“…When σ w = 27 MPa, the peak stress decreases the most, about 19.17%. This is mainly due to the increase of the amount of recycled coarse aggregate will lead to a variety of weak interfacial transition zone 29 . In the process of stress, the stress of RAC will preferentially transfer to the weak area of the interface, and stress concentration occurs, which accelerates the failure of RAC 38 …”

Section: Influencing Factors and Analysismentioning

confidence: 99%

“…Xu et al 28 simulated a Bayesian model improvement method for RAC that satisfies both uniaxial and triaxial compression based on data and theoretical basis. Chen et al 29 combined polyvinyl alcohol fiber with RAC, and found that polyvinyl alcohol fiber can effectively improve the modulus of elasticity of uniaxial compression specimens. Zeng et al 30 conducted triaxial compression tests on concrete cubes with different expansive agent contents and steel fiber contents, and found that steel fiber can significantly increase the axial peak stress, and its combined use with expansive agent has a synergistic and complementary effect.…”

Section: Introductionmentioning

confidence: 99%

Microscopic mechanism analysis and failure criterion study of glass fiber recycled concrete under three‐dimensional compressive stress state

Chen,

Wang,

Liang

et al. 2023

Structural Concrete

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This study aims to address the complex stress state commonly observed in concrete structures in practical engineering, as well as the challenges posed by resource scarcity and environmental pollution. To achieve this, a total of 168 cylinder specimens of glass fiber recycled coarse aggregate concrete (GFRAC) were designed for conventional triaxial compression tests. The analysis of the test results reveals that the application of lateral restraint force induces a shift in the failure mode of GFRAC from longitudinal splitting failure to plastic deformation failure, occurring either in the middle or at the end of the specimen. The lateral constraint force can effectively improve the stress and strain at the peak point of GFRAC and the modulus of elasticity of the specimen. The glass fiber increases the peak stress of the specimen, and the maximum growth rate is 20%. On the contrary, the glass fiber reduces the peak strain, and the maximum reduction is 49.66%. Increasing the replacement rate of recycled coarse aggregate will lead to a decrease in peak stress, with a maximum decrease of 19.17%. Glass fiber (GF) limits the appearance and propagation of cracks by bridging, pulling out or breaking. Finally, three different failure criteria are used to analyze the triaxial compression state of GFRAC from a macro perspective.

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“…It represents the ductility of the concrete. Based on the experimental data, and considering the effect of curing age t, parameter B can be described using Equation (7). B = t 0.41 + 0.21t (7) where t represents the curing age.…”

Section: Numerical Compressive Stress-strain Relationshipmentioning

confidence: 99%

Experiment on Compressive Properties and Microscopic Analysis of Sea Sand Geopolymer-Based Recycled Concrete

Xu,

An,

Chen

et al. 2023

Materials

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For marine and coastal engineering, construction resources have become scarce due to a limited local supply. Sea sand geopolymer-based recycled concrete (SSGRC) is an innovative cementitious material known for its eco-friendly benefits and corrosion resistance. This study explores the mechanical properties of SSGRC. The influences of the replacement rate of mineral slag, alkali activator concentrations, fine aggregate types, and curing ages on the compression strength of SSGRC were studied. The failure mechanism was analyzed using the failure patterns and compressive stress–strain curves. The results show that sea sand had a positive effect on geopolymer-based material. The SSGRC reached peak strength with an alkali activator concentration of 10 mol/L and a mineral slag replacement rate of 60%. The maximum stress and strain increased with an increasing curing age. The ratios of strength to the peak value were 55% and 85% after 1 day and 7 days, respectively. Using SEM, in the last hydration stage, the C-(A)-S-H gel was formed with a dense microstructure, and the geopolymer exhibited a favorable bonding performance. The constitutive models describing the complete stress–strain relationship under compression were developed.

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Experimental investigation on the mechanical behavior of polyvinyl alcohol fiber recycled aggregate concrete under triaxial compression

Cited by 25 publications

References 36 publications

Effect of hybrid fibers on the flexural performance of high‐strength recycled aggregate concrete beams

Effect of hybrid fibers on the flexural performance of high‐strength recycled aggregate concrete beams

Microscopic mechanism analysis and failure criterion study of glass fiber recycled concrete under three‐dimensional compressive stress state

Experiment on Compressive Properties and Microscopic Analysis of Sea Sand Geopolymer-Based Recycled Concrete

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