The influence of salt-frost cycles on the bond behavior distribution between rebar and recycled coarse aggregate concrete

Su, Tian; Wang, Ting; Wang, Chunguang; Yi, Haihe

doi:10.1016/j.jobe.2021.103568

Cited by 17 publications

(4 citation statements)

References 17 publications

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“…When the expansion force exceeds the tensile strength of the concrete, micro cracks begin to occur and radiate to the surrounding cement paste, thereby causing damage to the concrete [ 31 ]. The freeze–thaw damage is exacerbated by the increasing number of freeze–thaw cycles [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

Shear Bond Performance at Interface of Concrete-Filled Steel Tube after Freeze–Thaw Cycles

Liu

2022

Materials

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The shear bond performance between steel tube and concrete is the basis of a synergistic effect between two materials. When a concrete-filled steel tube structure is damaged by freeze and thaw cycles, the shear bond performance will deteriorate, which will inevitably affect the safety of the structure. In this paper, the effects of the numbers of freeze–thaw cycles, section type of steel tube, and concrete strength on the failure mode, bond strength, and peak slip of concrete-filled steel tube are investigated. In addition, the load–slip curve, the shear bond strength calculation formula, and the peak slip calculation formula are obtained. The results show that the shear bond performance decreases with the increase in freeze and thaw cycles; after 20 freeze and thaw cycles, the shear bond strength of the round steel tube specimen with 30 MPa decreases by 33.33%, while that of peak slip increases by 11.49%; the shear bond strength increases with the increase in concrete strength, while the degree of decrease in shear bond strength after freeze–thaw cycles is reduced; the shear bond strength of the round steel tube push-out specimen is higher than that of square steel tube push-out specimen, and after 20 freeze and thaw cycles, the shear bond strength of the round steel tube push-out specimen with 30 MPa/45 MPa is 0.86 MPa/1.62 MPa, while that of square steel tube push-out specimen with 30 MPa/45 MPa is 0.40 MPa/0.50 MPa.

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Section: Resultsmentioning

confidence: 99%

Shear Bond Performance at Interface of Concrete-Filled Steel Tube after Freeze–Thaw Cycles

Liu

2022

Materials

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“…The composition of construction waste is complex, among which waste concrete and waste bricks account for a large proportion [5]. Most of the existing research focuses on recycled coarse aggregate concrete [6], and the research on recycled brick aggregate concrete is relatively less. The research on recycled bricks aggregate concrete is of great significance for the recycling and utilization of construction waste.…”

Section: Introduction *mentioning

confidence: 99%

Effects of Nanomaterials Reinforced Aggregate on Mechanical Properties and Microstructure of Recycled Brick Aggregate Concrete

Wang¹,

WANG²,

CUI³

et al. 2023

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In this paper, the effects of nano-SiO2 and nano-Al2O3 on the brick aggregate properties, compressive strength of brick aggregate concrete at different ages, and microstructure of brick aggregate concrete are investigated. The results show that the water absorption of recycled brick aggregate decreases with the increase of nanomaterials solution concentrations, and the crush index of recycled brick aggregate decreases. Nano-SiO2 and nano-Al2O3 improve the compressive strength of recycled brick aggregate concrete at different ages, and the effect of nanomaterials on the early strength of concrete are more obvious. With the increase of nano-solution concentration, the compressive strength of nano-SiO2 reinforced brick aggregate concrete increases first and then decreases, while that of nano-Al2O3 reinforced brick aggregate concrete increases. The internal structure of nanomaterials reinforced brick aggregate is denser, micro cracks and pores are filled with hydration products, and the interfacial transition zone is more compact.

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“…Xie and Zhao [20] examined the effect of RCA on bond strength between steel bars and concrete, with both studies concluding that such additions caused a substantial reduction in strength. The steel-concrete bond strength particularly decreased when the RCA concrete is exposed to salt-frost cycles [21]. Godat et al [22] studied the bond strength between RCA-modified concrete and glass, carbon, and basalt fiber reinforced plastic bars and concluded that the presence of recycled aggregates enhanced the bearing friction between the bars and concrete.…”

Section: Introductionmentioning

confidence: 99%

Bond to Bar Reinforcement of PET-Modified Concrete Containing Natural or Recycled Coarse Aggregates

Khatib

Assaad

2022

Environments

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The use of post-consumer plastics in concrete production is an ideal alternative to dispose of such wastes while reducing the environmental impacts in terms of pollution and consumption of natural resources and energy. This paper investigates different approaches (i.e., reducing water-to-cement ratio and incorporating steel fibers or polymeric latexes) that compensate for the detrimental effect of waste plastics on the drop in concrete mechanical properties including the bond to embedded steel bars. The polyethylene terephthalate (PET) wastes used in this study were derived from plastic bottles that were shredded into small pieces and added during concrete batching at 1.5% to 4.5%, by total volume. Test results showed that the concrete properties are degraded with PET additions, given their lightweight nature and poor characteristic strength compared to aggregate particles. The threshold PET volumetric rates are 4.5% and 3% for concrete made using natural or recycled aggregates, respectively. The reduction of w/c from 0.55 to 0.46 proved efficient to refine the matrix porosity and reinstate the concrete performance. The incorporation of 0.8% steel fibers (by volume) or 15% polymers (by mixing water) were appropriate to enhance the bridging phenomena and reduce the propagation of cracks during the pullout loading of steel bars.

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The influence of salt-frost cycles on the bond behavior distribution between rebar and recycled coarse aggregate concrete

Cited by 17 publications

References 17 publications

Shear Bond Performance at Interface of Concrete-Filled Steel Tube after Freeze–Thaw Cycles

Shear Bond Performance at Interface of Concrete-Filled Steel Tube after Freeze–Thaw Cycles

Effects of Nanomaterials Reinforced Aggregate on Mechanical Properties and Microstructure of Recycled Brick Aggregate Concrete

Bond to Bar Reinforcement of PET-Modified Concrete Containing Natural or Recycled Coarse Aggregates

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