Characteristics of waste concrete powders from multi-recycled coarse aggregate concrete and their effects as cement replacements

Kim, Jeonghyun; Nciri, Nader; Sičáková, Alena; Kim, Nam-Ho

doi:10.1016/j.conbuildmat.2023.132525

Cited by 24 publications

(2 citation statements)

References 44 publications

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“…According to previous publications [ 22 , 23 , 24 , 25 ], the impact on concrete was well within acceptable limits when the content of RCA was less than 30%. Therefore, the substitution ratio of RCA was fixed at 30% to facilitate research on the effect of IOTs on RAC mixtures.…”

Section: Methodssupporting

confidence: 60%

The Mechanical Properties and Microstructure of Tailing Recycled Aggregate Concrete

Xu,

Li,

et al. 2024

Materials

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The aim of this study was to develop sustainable concrete by recycling concrete aggregates from steel waste and construction waste (iron ore tailings (IOTs) and recycled coarse aggregates (RCAs)) to replace silica sand and natural coarse aggregates. In experimental testing, the compressive strength, peak strain, elastic modulus, energy dissipated under compression, and compressive stress–strain curve were analyzed. Microscopically, scanning electron microscopy and energy-dispersive spectrometry were employed to investigate the microstructural characteristics of the interfacial transition zone (ITZ), and the results were compared with the ITZs of natural aggregate concrete and recycled aggregate concrete (RAC). In addition, the pore structure of concrete was determined by nuclear magnetic resonance. The results revealed that an appropriate IOT content can improve the ITZ and compactness of RAC, as well as optimize the mechanical and deformation properties of RAC. However, due to the presence of a smaller number of microcracks on the surface of IOT particles, excessive IOTs could reduce the integrity of the matrix structure and weaken the strength of concrete. According to the research, replacing silica sand with 30% IOTs led to a reduction in the porosity and microcracking which resulted in a much denser microstructure.

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Section: Methodssupporting

confidence: 60%

The Mechanical Properties and Microstructure of Tailing Recycled Aggregate Concrete

Xu,

Li,

et al. 2024

Materials

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“…Much research remains to be done to understand and optimize the use of ground recycled concrete as a binder in compressed earth blocks, since most of the work focuses on mortars and concrete manufacturing [19][20][21][22][23]. In this paper we focus on the ability of CEB to contain a considerable proportion of GRC evaluated in responses to damage-producing loads.…”

Section: Introductionmentioning

confidence: 99%

CEBs with GRC: Fabrication, characterization, modeling, and correlation with microstructural fracture features

Valenzuela,

Leiva,

Salas

et al. 2023

Materials Today Communications

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Sustainable Construction Exploration: A Review of Multi-Recycling of Concrete Waste

Kim

2024

Int J Environ Res

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This paper provides an overview of literature on the multiple-time recycling of concrete waste and meticulously analyzes the research findings. The paper begins by reviewing the characteristics of recycled materials such as recycled coarse aggregate, recycled fine aggregate, and recycled powder obtained from concrete waste in relation to the recycling cycle. The influence of each of these materials on the mechanical properties and durability of next-generation concrete is analyzed. Moreover, this paper introduces strategies reported in the literature that aim to enhance the performance of multi-recycled concrete. Lastly, this paper identifies and highlights limitations and research gaps, while providing insightful recommendations to drive future exploration of multi-recycling of concrete. Graphical Abstract

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Characteristics of waste concrete powders from multi-recycled coarse aggregate concrete and their effects as cement replacements

Cited by 24 publications

References 44 publications

The Mechanical Properties and Microstructure of Tailing Recycled Aggregate Concrete

The Mechanical Properties and Microstructure of Tailing Recycled Aggregate Concrete

CEBs with GRC: Fabrication, characterization, modeling, and correlation with microstructural fracture features

Sustainable Construction Exploration: A Review of Multi-Recycling of Concrete Waste

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