Multiscale ab-initio modeling and experiment of nano-CaCO3 and fiber synergy on toughening low-carbon geopolymer composites

Li, Li; Ma, Zhili; Ming, Xing

doi:10.1016/j.matdes.2023.112280

Cited by 15 publications

(3 citation statements)

References 51 publications

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“…It has been well confirmed that the incorporation of SF improves the working performance of RCAC, including better crack resistance, ductility, and toughness [17][18][19]. Also, the combination of SF and RCA Buildings 2023, 13, 2341 2 of 15 has great environmental and economic positive effects; SF can prevent the development of cracks in concrete through the bridging of the fibers and improve the strength and toughness of concrete [18,20,21]. SF-reinforced RCAC has great application potential for structural members [22].…”

Section: Introductionmentioning

confidence: 92%

Impact of Steel Fiber Volume Fraction and Morphology on the Strength of Recycled Aggregate Concrete

You,

Ma,

Zhang

et al. 2023

Buildings

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Steel-fiber-reinforced recycled coarse aggregate concrete (SFRCAC) has great potential for use in structural members due to environmental and economic reasons. A comparison of SF’s reinforcing effect on the strength of RCAC with natural recycled coarse aggregate concrete (NCAC) was conducted through experiments and analysis. Three types of steel fiber—milling (MF), shear-wave (SWF), and both-end hooked (BF)—were used. The SF volume fraction (Vf) was taken as 0, 0.5%, 1.0%, 1.5%, and 2%. The results show that SF has a similar reinforcing effect on NCAC and RCAC. The reinforcing effect of SF on the strength of RCAC is relevant to the strength of the RCAC matrix. The suitable content range of SF is from 0.5% to 1.5% in terms of the reinforcement effects on the compressive strength (ffcu) and splitting tensile strength (ffts) of RCAC. SF with a higher aspect ratio (AR) has a better reinforcing effect on the splitting tensile strength (ffts) and flexural strength (fftm) of RCAC. The equations of ffts/fts and fftm/ftm with the characteristic parameters of steel fiber (λf) were put forward to accurately determine the dosage of SF.

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Section: Introductionmentioning

confidence: 92%

Impact of Steel Fiber Volume Fraction and Morphology on the Strength of Recycled Aggregate Concrete

You,

Ma,

Zhang

et al. 2023

Buildings

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“…Second, the SBC of the wall degrades rapidly after the concrete at the bottom of the RC SW is crushed and peeled off, which reduces the energy dissipation capacity of the RC SW [9,10]. In order to improve the ductility and energy dissipation performance of ordinary RC SWs, some new improvement measures have been put forward one after another, such as improving the reinforcement ratio and increasing the numbers of wall reinforcements, SWs with vertical joins, SWs with horizontal joints, SWs with concealed bracing, steel-reinforced concrete SWs, and reinforcements with different fibers, or even changing the composition of concrete [11][12][13][14][15][16][17][18][19]. However, the improvement of ductility and energy dissipation capacity of RC SWs cannot simply rely on increasing the distribution reinforcement ratio, which will increase the construction difficulty.…”

Section: Introductionmentioning

confidence: 99%

Shear Bearing Capacity of Steel-Fiber-Reinforced Concrete Shear Wall under Low-Cycle Repeated Loading Based on the Softened Strut-and-Tie Model

You,

Zhang,

Wang

et al. 2023

Buildings

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In this paper, the loading mechanism of steel-fiber-reinforced concrete (SFRC) shear wall (SW) under low-cycle repeated loading is analyzed, and the softened strut-and-tie model (SSTM) of SFRC SW composed of horizontal and vertical resistant members and diagonal strut is proposed, in which the contributions of distributed web reinforcement, concrete, and steel fiber (SF) to the shear bearing capacity (SBC) of SFRC SW is identified. Furthermore, a new algorithm to obtain the SBC of SFRC SW is established, and then it is validated by using the test results of steel-fiber-reinforced high-strength concrete (SFHSC) SW and SFRC SW under low-cycle repeated loading. The results show that the calculated values are in good agreement with the experimental values for the 11 SFRC SWs, and the average strength ratio between calculated and experimental values (Vjh,t/Vjh,c) is 0.958. Therefore, the proposed calculation method is scientific and accurate for analyzing and predicting the SBC of SFRC SW. In addition, the proposed calculation method can scientifically and accurately analyze and predict the SBC of SFRC SW.

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“…The seismic behavior of steel fiber reinforced concrete (SFRC) shear walls subjected to reversed cyclic loading have been tested by several scholars (Zhou et al, 2018;Lou et al, 2021;Zadeh et al, 2021;Zhang et al, 2022). Just as anticipated, because the randomly distributed steel fibers can effectively improve anti-cracking property, tensile strength, shearing property, toughness, durability and seismic performance of matrix concrete, they can greatly improve the seismic performance of SFRCSW (SFRCSW), reduce the degree of reinforcement aggregation, and increase construction efficiency (Li et al, 2023d;Li et al, 2023e;Gu et al, 2023). With the increase of the volume ratio of steel fiber, the bearing capacity, ductility and energy dissipation capacity of SFRCSW increase.…”

mentioning

confidence: 99%

Shear bearing capacity calculation of low-rise SFRC shear wall with CFST columns based on simplified softened strut and tie model

You,

Li,

Qin

et al. 2024

Front. Mater.

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In the paper, an innovative shear wall, which is referred to as steel fiber reinforced concrete (SFRC) shear wall with concrete filled steel tube (CFST) columns, is introduced, based on the high bearing capacity and large stiffness of concrete filled steel tube column (CFSTC) and good cracking resistance and strong toughness of steel fiber reinforced concrete. The loading mechanism of steel fiber reinforced concrete shear wall (SFRCSW) with concrete filled steel tube columns is analyzed, and shear bearing capacity calculation method. A simplified model of the steel fiber reinforced concrete shear wall web softening tension bar is proposed, concrete and distributed web reinforcement to the shear bearing capacity of steel fiber reinforced concrete shear wall web is identified. Furthermore, a new algorithm to obtain the shear bearing capacity of steel fiber reinforced concrete shear wall with concrete filled steel tube columns is established, and then it is validated by using the test results of steel fiber reinforced concrete shear wall with concrete filled steel tube columns under low-cycle repeated loading. The results showed that all tested shear wall specimens exhibited obvious shear failure characteristics and a typical diagonal cracking pattern after test. The steel fibers obviously improved the crack forms of the steel fiber reinforced concrete shear wall web and the seismic behavior of steel fiber reinforced concrete shear wall with concrete filled steel tube columns. In addition, the proposed calculation method is scientific and accurate to analyze and predict the shear bearing capacity of low-rise steel fiber reinforced concrete shear wall with concrete filled steel tube columns.

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Multiscale ab-initio modeling and experiment of nano-CaCO3 and fiber synergy on toughening low-carbon geopolymer composites

Cited by 15 publications

References 51 publications

Impact of Steel Fiber Volume Fraction and Morphology on the Strength of Recycled Aggregate Concrete

Impact of Steel Fiber Volume Fraction and Morphology on the Strength of Recycled Aggregate Concrete

Shear Bearing Capacity of Steel-Fiber-Reinforced Concrete Shear Wall under Low-Cycle Repeated Loading Based on the Softened Strut-and-Tie Model

Shear bearing capacity calculation of low-rise SFRC shear wall with CFST columns based on simplified softened strut and tie model

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