Chemical admixtures for concrete: Effects of accelerators on the volume stability of cement-based materials

Wan, Zhenmin; He, Tingshu

doi:10.1016/j.mtcomm.2023.106256

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…The results show that an aluminum sulfate accelerator has a better pore structure distribution than an alkali accelerator, so it has good carbonation resistance and sulfate resistance. Our previous studies have found that an aluminum sulfate alkali-free accelerator has a small drying shrinkage deformation in shotcrete, and an aluminum fluoride alkali-free accelerator has a small autogenous shrinkage deformation. , …”

Section: Introductionmentioning

confidence: 94%

“…Our previous studies have found that an aluminum sulfate alkali-free accelerator has a small drying shrinkage deformation in shotcrete, and an aluminum fluoride alkali-free accelerator has a small autogenous shrinkage deformation. 9,10 The main chemical components of an fluorine-containing alkali-free accelerator are aluminum fluoride (AlF 3 ), aluminum sulfate (Al 2 (SO 4 ) 3 ), alcohol amine, and some other auxiliary materials, and the dosage is 6−9%. 11 The main mechanism is (4), (5), Ca 2+ + 2F − → CaF 2 (6).…”

Section: ■ Introductionmentioning

confidence: 99%

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Study on the Influence of Shrinkage-Reducing Materials on the Volume Stability of Shotcrete with a Fluorine-Containing Alkali-Free Accelerator

Wan,

He,

Zhao

2023

Langmuir

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In contrast to ordinary concrete, shotcrete exhibits greater shrinkage deformation. The utilization of an aluminum fluoride alkali-free accelerator (AF) is prevalent in tunnel engineering, attributed to its economical nature and fast setting and hardening. Currently, there is a dearth of research on the volume stability of aluminum fluoride accelerators, and no relevant studies have been conducted on the application of shrinkagereducing materials in shotcrete using an aluminum fluoride accelerator. With the use of an aluminum fluoride accelerator, the early strength of shotcrete is reduced, and the addition of a shrinkage-reducing agent (SRA) and super-absorbent polymer (SAP) can also lead to a further reduction in the early strength of concrete. Therefore, this study aims to investigate the influence of these two shrinkage-reducing materials (SRA and SAP) on the workability and mechanical properties of shotcrete. The primary focus of this research is to determine the better compensation effect of the two shrinkage-reducing materials. To accomplish this, the study focuses on assessing the setting time, compressive strength, and volume stability of shotcrete that has been mixed with an aluminum fluoride accelerator using SRA and SAP. Additionally, we also aim to explore the hydration and shrinkage compensation mechanism of these shrinkage-reducing materials on shotcrete by conducting a microscopic test analysis.

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Section: Introductionmentioning

confidence: 94%

Section: ■ Introductionmentioning

confidence: 99%

Study on the Influence of Shrinkage-Reducing Materials on the Volume Stability of Shotcrete with a Fluorine-Containing Alkali-Free Accelerator

Wan,

He,

Zhao

2023

Langmuir

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Extraction and characterization of bioplasticizer from lemon grass (Cymbopogan citratus) oil industry waste: a biomass conversion for cementitious composites applications

Suyambulingam,

Sudherson,

Perumal

et al. 2024

Biomass Conv. Bioref.

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Influence of accelerator type on the volume stability of shotcrete and the establishment of shrinkage model

Wan,

2024

Advances in Cement Research

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The characteristics of shotcrete can lead to significant shrinkage deformation, presenting potential threats to tunnel structure safety. To research this concern, this study investigated the effects of three accelerators on the volume stability of cement paste, cement mortar, and concrete. The correlation equations of shrinkage deformation of cement paste, cement mortar and concrete were established, and the drying shrinkage prediction model of cement mortar with accelerator was constructed by combining the ACI-209 model and the GL-2000 model. Findings from this study show that the AR accelerator had the greatest autogenous shrinkage and drying shrinkage, with the highest mass loss under drying conditions. The study demonstrated that there exists a good linear relationship between the shrinkage deformation of cement paste, cement mortar, and concrete with accelerator. Finally, the proposed prediction model for drying shrinkage of cement mortar exhibits strong predictive capabilities.

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Chemical admixtures for concrete: Effects of accelerators on the volume stability of cement-based materials

Cited by 3 publications

References 28 publications

Study on the Influence of Shrinkage-Reducing Materials on the Volume Stability of Shotcrete with a Fluorine-Containing Alkali-Free Accelerator

Study on the Influence of Shrinkage-Reducing Materials on the Volume Stability of Shotcrete with a Fluorine-Containing Alkali-Free Accelerator

Extraction and characterization of bioplasticizer from lemon grass (Cymbopogan citratus) oil industry waste: a biomass conversion for cementitious composites applications

Influence of accelerator type on the volume stability of shotcrete and the establishment of shrinkage model

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