Effect of different fibers on impermeability of steam cured recycled concrete

Yang, Wenrui; Tang, Zhiyi; Wu, Weiwei; Zhang, Kai; Yuan, Jiawei; Li, Huiying; Feng, Zhongmin

doi:10.1016/j.conbuildmat.2022.127063

Cited by 22 publications

(8 citation statements)

References 32 publications

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“…However, there were more pores in the test block, and the overall density of the structure was low. Under the action of external pressure, water could enter the interior of foamed concrete along the through-pores, resulting in poor impermeability [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Study on Impermeability of Foamed Concrete Containing Municipal Solid Waste Incineration Powder

Dong

Zhu

et al. 2022

Materials

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: In this paper, the effects of dry density, w/c ratio, and municipal solid waste incineration (MSWI) powder on the multi-scale properties and internal pore structure of foamed concrete were studied by using a single-factor controlled experiment. It was found that an increase in the dry density of foamed concrete could effectively reduce the porosity, leading to the improvement of compressive strength and impermeability and to the reduction of water absorption. The compressive strength, water absorption, and impermeability were mainly affected by the porosity when the w/c ratio changed. With the increase in porosity, the water absorption rate increased, and the compressive strength and impermeability decreased. The addition of MSWI powder caused no obvious change in the overall pore size distribution of the foamed concrete, and there was no significant change in the water absorption and impermeability of the structure. However, because the hydration activity of MSWI powder was lower than that of ordinary Portland cement, the compressive strength of foamed concrete decreased with the increase in MSWI powder.

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Section: Resultsmentioning

confidence: 99%

Study on Impermeability of Foamed Concrete Containing Municipal Solid Waste Incineration Powder

Dong

Zhu

et al. 2022

Materials

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“…In addition, the incorporation of PP improves concrete's performance in many aspects, including tensile strength, bending strength, toughness, impact resistance, and brittleness. 35,36 This means that the PP fiber RAC (PPFRAC) has better applications than RAC without fibers.…”

Section: Introductionmentioning

confidence: 99%

“…Based on those results, the PP over the cracks can reduce the crack width by up to 55% as a result of bridging action, and then the optimum content is 0.5%. In addition, the incorporation of PP improves concrete's performance in many aspects, including tensile strength, bending strength, toughness, impact resistance, and brittleness 35,36 . This means that the PP fiber RAC (PPFRAC) has better applications than RAC without fibers.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on mechanical properties of recycled aggregate concrete with polypropylene fiber under combined compression‐shear loading

Liu,

Chen,

Shen

et al. 2023

Structural Concrete

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To investigate the mechanical properties of polypropylene fiber recycled aggregate concrete (PPFRAC) under compression‐shear, 69 recycled aggregate concrete (RAC) specimens were tested with the parameters of polypropylene (PP) fiber volume content (0, 0.6, 0.9, and 1.2 kg/m3), recycled coarse aggregate (RCA) replacement rate (0%, 30%, 50%, 70%, and 100%), and normal stress (0, 3, and 6 MPa). In the tests, the failure pattern of the specimens was observed, and the effects of the polypropylene fiber content on the direct shear stress, compression‐shear stress, initial shear stiffness, and shear ductility coefficient of the PPFRAC were thoroughly investigated. The results show that as the polypropylene fiber content increases, the direct shear stress of concrete (Natural aggregate concrete and 100% recycled coarse aggregate concrete [100%RCA]) first increases and then decreases gradually. Meanwhile, the best PP fiber content is 0.9 kg/m3 in this study. Furthermore, the compression‐shear stress‐displacement curves of specimens were obtained. The compression‐shear strength under normal stress at 6 MPa is approximately 230% greater than at 0 MPa. However, the peak shear stress of concrete is almost not affected by the replacement rate of RCA. Finally, based on the Mohr circle theory, the compression‐shear calculation model of PPFRAC is verified, and the optimal calculation formula is given.

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“…A study conducted by Wu et al 21 investigated the mechanical behaviors of RAC under high temperatures and glass fibers, and found that recycled coarse aggregate concrete can be improved in terms of tensile strength, flexibility, and compressive strength by adding glass fiber. Yang et al 22 explored the effect of steel fibers, polypropylene fibers and glass fibers on the seepage resistance of recycled concrete and found that the fibers can improve the compressive strength and seepage resistance of recycled concrete. At present, the anti‐cracking mechanism of GF remains to be further studied, and the research on the mechanical behavior of glass fiber recycled coarse aggregate concrete (GFRAC) under multi‐axial stress conditions is rarely reported.…”

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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Effect of different fibers on impermeability of steam cured recycled concrete

Cited by 22 publications

References 32 publications

Study on Impermeability of Foamed Concrete Containing Municipal Solid Waste Incineration Powder

Study on Impermeability of Foamed Concrete Containing Municipal Solid Waste Incineration Powder

Experimental study on mechanical properties of recycled aggregate concrete with polypropylene fiber under combined compression‐shear loading

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

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