Shear Behavior of Recycled Fine Aggregate Reinforced by Nano-MgO Modified Cement

Tao, Zhu; Shou, Yitong; Chen, Xiaoqing; Lv, Beifeng; Huang, Xianwen; Yu, Yanfei; Li, Chun‐Zhu

doi:10.3390/ma15207188

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…In recent years, the overconsumption of natural sand resources and the disposal of large quantities of construction and demolition (C&D) waste have become a major concern. To address this issue, recycling C&D waste and converting it into recycled fine aggregate has become an important method to reduce concrete costs, alleviate the scarcity of natural resources, and improve environmental sustainability [ 8 , 9 , 10 , 11 ]. Previous research has shown that incorporating up to 40% recycled fine aggregate into concrete can yield good mechanical and durability properties [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Salt Solution Erosion on Mechanical Properties and Micropore Structure of Recycled Fine Aggregate ECC

Xiang,

Han,

Liu

2024

Materials

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This study examined the impact of sulfate and sulfate–chloride dry–wet cyclic erosion on the mechanical properties and microscopic pore structure of engineered cementitious composite (ECC) with recycled fine aggregate (RA). Uniaxial tensile tests and four-point bending tests were conducted to evaluate the mechanical properties of RAECC, while the resonance frequency ratio was used to assess the integrity of the specimens. Finally, X-ray computed tomography (X-CT) reconstruction was employed to analyze the erosion effects on the microscopic pore structure. The results showed that the uniaxial tensile strength and flexural strength of the RAECC specimens in corrosive solution first increased and then decreased, and the 5% Na2SO4 solution caused the most serious erosion of the specimens. The resonance frequency ratio of the specimens reached the peak value when they were subjected to dry–wet cycles 15 times in the 5% Na2SO4 solution. During the erosion process, the pore space of the specimen first decreased and then increased, and the number of pores increased. The erosion process is the result of the erosion products continuously filling and eventually destroying the pores, and the erosion damage produces a large number of new pores and poor sphericity, leading to a decline in mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Effect of Salt Solution Erosion on Mechanical Properties and Micropore Structure of Recycled Fine Aggregate ECC

Xiang,

Han,

Liu

2024

Materials

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The study of physico-mechanical properties of SiO2-impregnated wood under dry and saturated conditions

Lemaire-Paul,

Foruzanmehr

2023

Wood Sci Technol

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This research has demonstrated that SiO 2 impregnation under high vacuum pressure of -90 kPa can signi cantly reduce porosity by almost 10%, and improve mechanical and viscoelastic properties of spruce wood under dry and saturated states. Characterization methods, such as Impact test, DMA, SEM, EDS, Porosity and SAXS tests were conducted on nontreated and -90 kPa treated spruce wood samples under dry, saturated and submerged states to analyze the synergistic effect of high vacuum SiO 2 impregnation pressure on wood's properties. The results showed that high vacuum impregnation pressure had a signi cant positive reinforcing effect on wood's properties. It increased the impact resistance of wood under dry and saturated conditions. Additionally, the high vacuum impregnation technique was able to overcome the water-induced softening effect and caused a signi cant increase in the Storage modulus through uniform dispersion of the SiO 2 particles in the wood's vascular structure. Consequently, the impregnation reinforced the wood, and ameliorated its capacity to absorb energy. High vacuum impregnation was also able to counteract the plasticizing effect of the water molecules and signi cantly increased the Loss modulus by increasing the internal friction and cohesion of the wood components with the addition of the nanoparticles to the vascular system, which increased the wood's capacity to transform and dissipate energy. Quantitatively and qualitatively, impregnation under a vacuum pressure of -90 kPa exhibited an effective obstruction of the vascular structure of spruce wood. In all conditions, high vacuum impregnated samples showed signi cant enhancements over non-treated samples. This research demonstrated that high vacuum SiO 2 impregnation is an effective wood processing techniques. Multiple materials and applications could bene t from this research wherein high strain-rate deformations is expected to occur or when simultaneous elastic behaviour of wood and its damping energy is needed. This study could also pave the way for research on the synergistic effect of SiO 2 impregnation and water absorption on the viscoelastic behaviour of wood.

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The study of physico-mechanical properties of SiO 2 impregnated wood under dry and saturated conditions

Lemaire-Paul

Foruzanmehr

2023

Preprint

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This research has demonstrated that SiO2 impregnation under high vacuum pressure of -90 kPa can significantly reduce porosity by almost 10%, and improve mechanical and viscoelastic properties of spruce wood under dry and saturated states. Characterization methods, such as Impact test, DMA, SEM, EDS, Porosity and SAXS tests were conducted on non-treated and -90 kPa treated spruce wood samples under dry, saturated and submerged states to analyze the synergistic effect of high vacuum SiO2 impregnation pressure on wood’s properties. The results showed that high vacuum impregnation pressure had a significant positive reinforcing effect on wood’s properties. It increased the impact resistance of wood under dry and saturated conditions. Additionally, the high vacuum impregnation technique was able to overcome the water-induced softening effect and caused a significant increase in the Storage modulus through uniform dispersion of the SiO2 particles in the wood’s vascular structure. Consequently, the impregnation reinforced the wood, and ameliorated its capacity to absorb energy. High vacuum impregnation was also able to counteract the plasticizing effect of the water molecules and significantly increased the Loss modulus by increasing the internal friction and cohesion of the wood components with the addition of the nanoparticles to the vascular system, which increased the wood’s capacity to transform and dissipate energy. Quantitatively and qualitatively, impregnation under a vacuum pressure of -90 kPa exhibited an effective obstruction of the vascular structure of spruce wood. In all conditions, high vacuum impregnated samples showed significant enhancements over non-treated samples. This research demonstrated that high vacuum SiO2 impregnation is an effective wood processing techniques. Multiple materials and applications could benefit from this research wherein high strain-rate deformations is expected to occur or when simultaneous elastic behaviour of wood and its damping energy is needed. This study could also pave the way for research on the synergistic effect of SiO2 impregnation and water absorption on the viscoelastic behaviour of wood.

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Shear Behavior of Recycled Fine Aggregate Reinforced by Nano-MgO Modified Cement

Cited by 3 publications

References 21 publications

Effect of Salt Solution Erosion on Mechanical Properties and Micropore Structure of Recycled Fine Aggregate ECC

Effect of Salt Solution Erosion on Mechanical Properties and Micropore Structure of Recycled Fine Aggregate ECC

The study of physico-mechanical properties of SiO2-impregnated wood under dry and saturated conditions

The study of physico-mechanical properties of SiO 2 impregnated wood under dry and saturated conditions

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