Seismic behaviors of tailings and recycled aggregate concrete-filled steel tube columns

Chen, Zhihua; Chen, Jingxin; Du, Yansheng; Zhang, Yutong; Zhen, Zhilu; Liu, Yongqi; Zhan, Linshan

doi:10.1016/j.conbuildmat.2022.130115

Cited by 13 publications

(2 citation statements)

References 30 publications

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“…Besides, PAC has low shrinkage but higher brittleness compared to conventional concrete, while steel pipes have good ductility 25 , 26 . Combining prepacked aggregate concrete with steel pipe concrete structures can be expected to improve the brittleness of prepacked aggregate concrete and solve the problem of volume shrinkage causing voids in steel pipe concrete components, realizing the development of prepacked aggregate concrete in structural engineering 27 – 29 . However, there is limited research in this area.…”

Section: Introductionmentioning

confidence: 99%

Designing prepacked aggregate concrete for improved mechanical properties and its field application in constructing steel tube concrete

Zhou,

Bai,

Zhang

et al. 2024

Sci Rep

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Prepacked aggregate concrete (PAC) is made by placing coarse aggregates of various sizes into a formwork and then filling the voids between coarse aggregate and grout. The mechanical performance of PAC is dominated by the compactness due to grout filling, but few study considered the pouring methods and grout performance synchronously. The coupled effect of pouring methods and grout performance on the compactness of PAC is investigated in this study. The results show that the gravity pouring method is only suitable for grouts with good flowability. The pump pouring method is more widely used. It can be adapted to grout with poorer fluidity and coarse aggregate with greater apparent density. The ultrasonic pulse velocity test method provides a relatively accurate evaluation of the compactness of PAC. Furthermore, due to the enhanced mechanical properties of PAC, the filed application potential in the preparation of steel tube concrete columns has also been confirmed, where the results exhibited that PAC based steel tube concrete contributed to an enhanced ductility and autogenous shrinkage.

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Section: Introductionmentioning

confidence: 99%

Designing prepacked aggregate concrete for improved mechanical properties and its field application in constructing steel tube concrete

Zhou,

Bai,

Zhang

et al. 2024

Sci Rep

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“…The penetration performance of the pore structure is the most important index affecting the permeability. The number of connected pores and the size of the pore diameter can provide favorable channels for the transmission of toxic and harmful substances [25,26]. At present, there are few reports on the pore structure and permeability of backfill.…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Wang,

Chen,

Guo

et al. 2023

Materials

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Backfill mining has significant advantages in safe mining, solid waste utilization and ecological environmental protection, but solid waste materials (tailings, gangue and coal gasification slag, etc.), as derivative residues of the chemical and metallurgical industries, contain a large number of heavy metal elements, which is posing great challenges to the underground environment after backfill. In order to study the feasibility of bentonite for reducing the permeability of gangue/tailing sand cemented backfill body, relevant tests were carried out from the basic performance index, flow performance and mechanical properties of paste backfill materials. The test results show that bentonite has a significant effect on the water secretion rate of cemented fillers, and also promotes the improvement of slump and diffusion diameter of backfill slurry. The enhancement effect of mechanical properties in the early stage is not obvious, mainly concentrated in the middle and late stages of specimen curing. With the increase of bentonite content, the 28-day uniaxial compressive strength increased from 7.1 MPa and 7.9 MPa to 8.7 MPa and 9.0 MPa, respectively. Bentonite is filled between the pores of the cemented backfill with its fine particles and water swelling, which can reduce the porosity and permeability of the gangue and tailings cemented backfill. Therefore, on the premise of satisfying the flow and mechanical properties of paste backfill, bentonite can be used to improve the permeability of cemented backfill and reduce the leaching and migration of heavy metal ions.

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Experimental study on seismic behavior of recycled aggregate concrete infilled profile steel structures

Liu,

Yang

2024

J Braz. Soc. Mech. Sci. Eng.

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Seismic behaviors of tailings and recycled aggregate concrete-filled steel tube columns

Cited by 13 publications

References 30 publications

Designing prepacked aggregate concrete for improved mechanical properties and its field application in constructing steel tube concrete

Designing prepacked aggregate concrete for improved mechanical properties and its field application in constructing steel tube concrete

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Experimental study on seismic behavior of recycled aggregate concrete infilled profile steel structures

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