Investigation on bond strength between recycled aggregate concrete (RAC) and steel tube in RAC-filled steel tubes

Lyu, Wan-Qing; Han, Lin‐Hai

doi:10.1016/j.jcsr.2018.12.028

Cited by 99 publications

(27 citation statements)

References 14 publications

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“…The slip corresponding to the peak load (S u ) increased almost linearly with the D/t ratio, as shown in Figure 10. The observation of the variation tendency of bond stress (τ u ) and slip corresponding to peak load (S u ) of CFT-PAC with D/t ratio were similar to the circular steel tube filled with other types of concrete [16,30,45]. Figure 10 presented the variation of bond stress (τu) and slip corresponding to peak load (Su) with D/t ratio.…”

Section: Axial and Lateral Strain Distributionssupporting

confidence: 53%

“…When the load exceeded the bond load, the slip at both of the free end and the loaded increased continually while the load basically remained invariable. The load-slip curves could be divided into three stages: before critical load, critical load to bond load and after bond load, which was similar to the load-slip curves of normal concrete-filled steel tubes [16], manufactured sand concrete-filled steel tube [45] and recycled aggregate concrete-filled steel tube [30]. Before critical load, the bond resistance was mainly provided by chemical adhesion.…”

Section: Methodsmentioning

confidence: 83%

“…Plenty of studies have been conducted on the properties of the CFT column, including compressive behavior [13][14][15], bond behavior [16][17][18][19], seismic performance [20,21], fire resistance [22][23][24], and so on. Meanwhile, numerous different types of concrete have been also used in concrete-filled steel tubes, such as lightweight aggregate concrete [25,26], high-strength concrete [27], recycled aggregate concrete [28][29][30][31][32] and fiber-reinforced plastic (FRP)-confined concrete [33,34]. Utilization of different types of concrete in CFT will achieve disparate benefits.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns

Zhou

et al. 2020

Materials

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In order to investigate the bond behavior of preplaced aggregate concrete-filled steel tube (CFT-PAC) columns and the difference of bond behavior between CFT-PAC columns and normal concrete-filled steel tube (CFT-NC) columns, a total of 11 columns were prepared and the push-out tests were conducted. The experimental parameters included the type of concrete (preplaced aggregate concrete and normal concrete), concrete strength (C40, C50 and C60), cross-section dimension (D = 219 mm, 299 mm and 351 mm) and the thickness of steel tube (t = 6 mm and 8 mm). The results indicated that the CTF-PAC columns had a similar load-slip curves with CFT-NC columns. The bond stresses of the CFT-PAC columns were higher than that of the PAC-NC columns at the same concrete strength. Increasing compressive strength of PAC increased the critical bond strength and bond strength of CFT-PAC columns. With an increase of the L/D ratio, both of the slip corresponding to peak load and bond strength of CFT-PAC columns exhibited an increasing trend. A rise in the D/t ratio led to a decrease in the bond stress of CFT-PAC columns and an increase in slip corresponding to the peak load of CFT-PAC columns. The proposed bond stress–slip relationship model considerably matched the bond stress–slip relationship of CFT-PAC columns.

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Section: Axial and Lateral Strain Distributionssupporting

confidence: 53%

Section: Methodsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns

Zhou

et al. 2020

Materials

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“…The interface bonding force of the CFST consists of chemical bonding force, mechanical biting force, and frictional resistance [ 11 ]. There are many factors that affect the interface bonding strength of CFST, such as the shrinkage of concrete, water-to-binder ratio, and additives [ 12 , 13 ]. Xiushu Qu [ 14 ] studied the influence of factors such as the amount of concrete expansion agent and compressive strength of concrete on the bonding strength of concrete.…”

Section: Introductionmentioning

confidence: 99%

Interface Bonding Behavior of Concrete-Filled Steel Tube Blended with Circulating Fluidized Bed Bottom Ash

Liu

Cheng

et al. 2021

Materials

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The interface bonding behavior between the steel tube and the concrete of concrete-filled steel tube (CFST) blended with circulating fluidized bed bottom ash (CFB-BA) was investigated in this study. A total of 8 groups of CFSTs stub columns were prepared with different dosage of CFB-BA, water-binder ratio (W/B), and interface bonding length. A series of push-out tests were carried out to acquire the data representing the interface bonding behavior. The results show that the dosage of CFB-BA has a direct effect on interface bonding behavior of CFST. CFB-BA can improve the interface bonding behavior of CFST. The highest ultimate bonding load and strength are achieved when the dosage of CFB-BA is 30%. When the dosage of CFB-BA increases to 50%, its interface bonding behavior decreases, but is still better than that of CFST without CFB-BA. W/B has a negative correlation with the interface bonding behavior of CFST. While the W/B increases, the interface bonding load and strength of CFST decreases. The increase of the interface bonding length can improve the interface bonding load, but cannot improve the interface bonding strength.

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“…DSPCs have some differences from traditional CCPs, concrete-filled steel columns, or concrete plugs embedded in tubular steel piles [2,4,5]. In a DSPC, the steel casing is partially used (Figure 1); then, a hole is drilled in the casing, and the soil in the tube is removed by the slurry method.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Bending Behavior of a Drilled Shaft with Partial Casing under Lateral Loads

Dai

Yang

et al. 2021

Applied Sciences

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Few studies, especially those related to field tests, have examined the bending behaviors of drilled shafts with partial casings (DSPCs). This work reports the results of experimental studies on the behavior of DSPCs under lateral loads, including an in situ test and a set of laboratory tests. First, a DSPC with a diameter of 2 m and length of 87.9 m was studied in clay beds, and a steel casing with a diameter of 2.0 m and length of 33 m was used. In this test, strain gauges were distributed along the steel rebars in the concrete pile and the wall of the steel tube at different depths, and thus the longitudinal strains of the concrete pile and the steel tube could be studied. Second, laboratory experiments were implemented with reinforced concrete-filled steel tubular columns under pure bending conditions. In these tests, strain gauges were distributed along the steel rebars in the concrete pile and the walls of the steel tubes at the pure bending section of the specimens. Different wall thicknesses and drilling fluid conditions were considered. The field test results show that the strain of the concrete piles and the steel tubes were linearly distributed at the same cross-section. This means that a DSPC remains a flat plane after it deforms. Whereas a correction coefficient related to the loading level need to be considered in the calculation of the bending stiffness. Laboratory studies show that the strain of DSPCs was linearly distributed at a small bending moment under the best bond-quality condition, whereas obvious nonlinear behaviors were shown under a large bending moment with poor bond-quality conditions.

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Investigation on bond strength between recycled aggregate concrete (RAC) and steel tube in RAC-filled steel tubes

Cited by 99 publications

References 14 publications

Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns

Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns

Interface Bonding Behavior of Concrete-Filled Steel Tube Blended with Circulating Fluidized Bed Bottom Ash

Experimental Evaluation of the Bending Behavior of a Drilled Shaft with Partial Casing under Lateral Loads

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