Size effect on dynamic compressive failure mode and mechanical properties of recycled concrete

Liu, Chunyang; Gao, Yingqi; Luan, Kaiye; Su, Jing; Lin, Ye

doi:10.1002/suco.202201150

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…[6][7][8][9][10] However, a few investigations have shown the efficacy of recycled aggregate concrete (RAC) for its utilization in concrete. [11][12][13] Using carbon fiber reinforced polymers (carbon-FRP) is getting increasingly common in structural engineering to strengthen and rehabilitate existing structures. The external carbon-FRP wraps confined the concrete core and prevent the core concrete to expand resulting in more energy absorption.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of FRP confinement for low strength recycled aggregate concrete compressive members having optimized combination of fibers

Raza,

Elhag,

Ouni

et al. 2023

Structural Concrete

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The quantity of recycled concrete aggregates is increasing day by day due to the enhanced demolition rate of old infrastructures, which is dangerous to the environment's sustainability. Therefore, it is essential to handle these recycled aggregates for sustainable development. Furthermore, due to the low compressive strength (COS) of recycled aggregate concrete (RAC), it has always remained an active research area to ameliorate the mechanical performance of such concrete by either adding fibers and/or laterally confining with carbon fiber reinforced polymer (carbon‐FRP) wraps. The main objective of the current investigation is to improve the strength of hybrid fiber‐reinforced recycled aggregate concrete (HFRAC) transversely wrapped with carbon‐FRP wraps. The axial COS, axial strain, and compressive stress–strain graphs of the tested samples were assessed by manufacturing a total sum of 18 cylindrical samples wrapped with either one or two carbon‐FRP wraps. Two different grades of HFRAC were fabricated that is, 15 and 20 MPa containing hybrid fibers (steel and polypropylene fibers). The results showed that the transverse wrapping effectively ameliorated the axial strain, COS, and axial stiffness of HFRAC samples. By using a single layer of carbon‐FRP wraps, an enhancement of 115.7% was observed while using two layers of carbon‐FRP wraps, an enhancement of 130.7% was observed in the COS of 15 MPa group HFRAC samples. Similarly, by using a single layer of carbon‐FRP wraps, an enhancement of 37.4% occurred while using two layers of carbon‐FRP wraps, an enhancement of 112.6% occurred in the COS of 20 MPa group HFRAC samples. Hence, the lateral wrapping of low‐strength HFRAC is more efficient than the high‐strength HFRAC. A theoretical investigation based on the analysis of 11 different models was also performed to predict the COS of carbon‐FRP‐wrapped HFRAC samples.

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Section: Introductionmentioning

confidence: 99%

Effectiveness of FRP confinement for low strength recycled aggregate concrete compressive members having optimized combination of fibers

Raza,

Elhag,

Ouni

et al. 2023

Structural Concrete

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Effects of recycled sand and shell sand as sand replacement on the dynamic properties of seawater sea-sand recycled aggregate concrete

Zhang,

Ou,

Lan

et al. 2024

Journal of Sustainable Cement-Based Materials

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Behavior of geometrically-similar Basalt FRP bars-reinforced concrete beams under dynamic torsional loads

Lei,

Jin,

et al. 2024

International Journal of Damage Mechanics

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A numerical model utilizing 3D mesoscale simulation methods was developed to investigate the influence of strain rate on the torsional performance of geometrically similar Basalt Fiber Reinforced Polymer bars-reinforced concrete (BFRP-RC) beams, as well as the corresponding size effects. The model incorporates concrete heterogeneity, material strain rate effects, and the dynamic bond-slip relationship between BFRP bars and concrete. The torsional performance of BFRP-RC beams with different structural sizes and stirrup ratios was analyzed under different strain rates. The study yielded the following findings: (1) The damage degree of BFRP-RC beams increases with the rising strain rate. (2) Increasing strain rate and stirrup ratio enhances the beams’ torsional strength and ductility while attenuating the size effect, albeit not eliminating it. (3) The impact of increasing strain rate on beam strength, ductility, and size effect outweighs that of increasing stirrup ratio. Finally, based on the Bažant size effect law (SEL) combined with the simulation results, a new size effect law was proposed that can quantitatively consider the effect of strain rate and stirrup ratio on the torsional strength of BFRP-RC beams.

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Size effect on dynamic compressive failure mode and mechanical properties of recycled concrete

Cited by 5 publications

References 30 publications

Effectiveness of FRP confinement for low strength recycled aggregate concrete compressive members having optimized combination of fibers

Effectiveness of FRP confinement for low strength recycled aggregate concrete compressive members having optimized combination of fibers

Effects of recycled sand and shell sand as sand replacement on the dynamic properties of seawater sea-sand recycled aggregate concrete

Behavior of geometrically-similar Basalt FRP bars-reinforced concrete beams under dynamic torsional loads

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