Utilizing heat treatment for making low-quality recycled aggregate into enhanced recycled aggregate, recycled cement and their fully recycled concrete

Wu, Huixia; Liang, Chaofeng; Zhang, Zhiyu; Yao, Pengpeng; Ma, Zhiming

doi:10.1016/j.conbuildmat.2023.132126

Cited by 22 publications

(9 citation statements)

References 43 publications

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“…In order to enhance the quality of RA, researchers are currently trying innovative methods of treatment [ 9 , 10 , 11 ]. Wu et al [ 10 ] demonstrated that old mortar can be effectively separated from RA surfaces by thermal treatment at 700 °C. Wang et al [ 12 ] tested modifying RA using different concentrations of acetic acid and soaking times with acetic acid.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the old interfacial transition zone (ITZ), which consists of the original natural aggregates and old mortar, has a significant negative impact on RA performance [8]. In order to enhance the quality of RA, researchers are currently trying innovative methods of treatment [9][10][11]. Wu et al [10] demonstrated that old mortar can be effectively separated from RA surfaces by thermal treatment at 700 • C. Wang et al [12] tested modifying RA using order to enhance the quality of RA, researchers are currently trying innovative methods of treatment [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…In order to enhance the quality of RA, researchers are currently trying innovative methods of treatment [9][10][11]. Wu et al [10] demonstrated that old mortar can be effectively separated from RA surfaces by thermal treatment at 700 • C. Wang et al [12] tested modifying RA using order to enhance the quality of RA, researchers are currently trying innovative methods of treatment [9][10][11]. Wu et al [10] demonstrated that old mortar can be effectively separated from RA surfaces by thermal treatment at 700 °C.…”

Section: Introductionmentioning

confidence: 99%

“…Wu et al [10] demonstrated that old mortar can be effectively separated from RA surfaces by thermal treatment at 700 • C. Wang et al [12] tested modifying RA using order to enhance the quality of RA, researchers are currently trying innovative methods of treatment [9][10][11]. Wu et al [10] demonstrated that old mortar can be effectively separated from RA surfaces by thermal treatment at 700 °C. Wang et al [12] tested modifying RA using different concentrations of acetic acid and soaking times with acetic acid.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Behavior and Stress–Strain Model of Nano-SiO2-Modified Recycled Aggregate Concrete

Zhou,

Xu,

Lin

et al. 2024

Materials

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Recycled aggregate concrete (RAC) possesses different mechanical properties than ordinary concrete because of inherent faults in recycled aggregates (RAs), such as the old interfacial transition zone (ITZ). However, the application of nano-SiO2 presents an effective methodology to enhance the quality of RA. In this study, nano-SiO2-modified recycled aggregate (SRA) was used to replace natural aggregate (NA), and the stress–strain relationships and cyclic behavior of nano-SiO2-modified recycled aggregate concrete (SRAC) with different SRA replacement rates were investigated. After evaluating the skeleton curve of SRAC specimens, the existing constitutive models were compared. Additionally, the study also proposed a stress–strain model designed to predict the mechanical behavior of concrete in relation to the SRA replacement rate. The results show that compared with RAC, the axial compressive strength of SRAC specimens showed increases of 40.27%, 29.21%, 26.55%, 16.37%, and 8.41% at specific SRA replacement rates of 0%, 30%, 50%, 70%, and 100%, respectively. Moreover, the study found that the Guo model’s calculated results can accurately predict the skeleton curves of SRAC specimens.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cyclic Behavior and Stress–Strain Model of Nano-SiO2-Modified Recycled Aggregate Concrete

Zhou,

Xu,

Lin

et al. 2024

Materials

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“…However, it is difficult to ensure the homogeneity of the recycled aggregates. Compared with using natural aggregates, concrete using recycled aggregates may lead to defects including low workability, low strength and other durability problems [ 53 , 54 , 55 ]. Because of the low performance of recycled concrete aggregates, it is commonly believed that the replacement ratio of recycled concrete aggregates cannot be higher than 30% for the total mass of aggregates [ 56 , 57 , 58 , 59 ].…”

Section: Introductionmentioning

confidence: 99%

Mass GGBFS Concrete Mixed with Recycled Aggregates as Alkali-Active Substances: Workability, Temperature History and Strength

Huo

Huang²,

Han

et al. 2023

Materials

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This study provides the results of an experiment on the possibility of using high-volume ground granulated blast furnace slag (HVGGBFS)-based concrete as mass concrete. In addition to the control concrete, the total weight of the binder was 75% ground granulated blast furnace slag (GGBFS) and 25% ordinary Portland cement (OPC). For the aggregates, both natural and recycled aggregates were used. Three specimens with dimensions of 800 mm × 800 mm × 800 mm were prepared to simulate mass concrete. The workability, temperature aging and strength of the mass concrete were tested. The test results showed that utilizing HVGGBFS concrete as mass concrete can significantly reduce the heat of hydration due to the low heat of hydration of GGBFS, while the heat of hydration of GGBFS and recycled aggregate combination is 11.2% higher than normal concrete, with a slump that is 31.3% lower than that of plain concrete. The results also showed that the use of recycled aggregates in HVGGBFS concrete can significantly reduce workability. However, the compressive strength is higher than when natural aggregates are used due to the alkali activation effect caused by the recycled aggregates. The compressive strength at 7 and 28 days increased by 33.7% and 16.3%, respectively.

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Investigation of desiccation cracking in unsaturated clays improved by recycled micro-concrete particles

Ye,

Zhao,

Xie

2024

Bull Eng Geol Environ

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Utilizing heat treatment for making low-quality recycled aggregate into enhanced recycled aggregate, recycled cement and their fully recycled concrete

Cited by 22 publications

References 43 publications

Cyclic Behavior and Stress–Strain Model of Nano-SiO2-Modified Recycled Aggregate Concrete

Cyclic Behavior and Stress–Strain Model of Nano-SiO2-Modified Recycled Aggregate Concrete

Mass GGBFS Concrete Mixed with Recycled Aggregates as Alkali-Active Substances: Workability, Temperature History and Strength

Investigation of desiccation cracking in unsaturated clays improved by recycled micro-concrete particles

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