Shrinkage characteristics of calcium sulphoaluminate cement concrete

Ke, Guoju; Zhang, Jun; Liu, Yuzhang

doi:10.1016/j.conbuildmat.2022.127627

Cited by 24 publications

(15 citation statements)

References 27 publications

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“…The hydration product drying deformation of SAC and PC is different. The drying deformation of hydrated calcium aluminate is smaller than that of hydrated calcium silicate [8]. Gypsum, silica fume, mineral powder, and fly ash can improve the performance of the PC-SAC cementitious system.…”

Section: Introductionmentioning

confidence: 94%

Study on the Strength, Permeability, and Drying Shrinkage of Mortar with Portland Cement and Sulphoaluminate Cement

Nong,

Yuan,

et al. 2024

J. Phys.: Conf. Ser.

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Adding sulphoaluminate cement (SAC) to Portland cement (PC) can affect the growth of hydration products and further affect the properties of the matrix. In this paper, the influence of SAC content on the impermeability, drying shrinkage and strength of mortar was studied by replacing PC with no more than 20% SAC. The results show that with the increase of SAC content, acicular ettringite (AFt) in cement stone gradually decreases, the compressive and flexural strength of mortar decreased first and then increased, and the strength was lowest when the content of SAC was 10%. The addition of SAC intensified the drying shrinkage of mortar. The greater the amount of SAC added, the higher the dry shrinkage value and the worse the impermeability of mortar.

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Section: Introductionmentioning

confidence: 94%

Study on the Strength, Permeability, and Drying Shrinkage of Mortar with Portland Cement and Sulphoaluminate Cement

Nong,

Yuan,

et al. 2024

J. Phys.: Conf. Ser.

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“…Therefore, utilization of seawater to replace freshwater in concrete mixing is becoming a research hotspot in the civil engineering field. In the 1970s, the Chinese Academy of Building Materials developed calcium sulphoaluminate (CSA) cement [2][3][4][5], recognized for its principal hydration products, notably ettringite (AFt), AFm, and AH3. Particularly in marine settings, CSA concrete exhibits diminished chloride ion diffusion coefficients and heightened resistance to chloride ions.…”

Section: Introductionmentioning

confidence: 99%

“…Particularly in marine settings, CSA concrete exhibits diminished chloride ion diffusion coefficients and heightened resistance to chloride ions. Moreover, the hydration product AFt within CSA demonstrates limited reactivity with SO 4 2− and Mg 2+ present in seawater, ensuring the durability of CSA concrete [6]. Consequently, CSA emerges as a promising material for employment in marine engineering.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, CSA emerges as a promising material for employment in marine engineering. Nonetheless, the extensive presence of ions in seawater poses potential challenges, as these sea salt ions (SO 4 2− , Cl − , Mg 2+ ) profoundly influence CSA hydration by engaging in the hydration process and altering the pH environment of CSA hydration [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Impacts of Three Sea Salt Ions on the Performance of CSA-OPC Binary System

Wang,

Zhou,

et al. 2024

Buildings

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This study aimed to explore the impact of three corrosive ions—SO42−, Cl−, and Mg2+—on the hydration property of calcium sulphoaluminate (CSA) cement. Cement paste was prepared using three types of sea salt ion solutions with varying concentrations as mixing water. The experimental program encompassed assessments of porosity, compressive/flexural strength, heat of hydration, pH of pore solution, XRD, and SEM analysis. To modulate the hydration environment, Ordinary Portland cement (10%) was incorporated to elevate the pH and enhance the stability of ettringite, thereby facilitating the formation of additional C-S-H gel for the observation of M-S-H and other compounds. Findings revealed that the Cl− accelerated the hydration of CSA, resulting in heightened heat release. However, it also decreased the length-to-diameter ratio of ettringite, leading to cracking in CSA test blocks. The addition of SO42− resulted in elevated internal alkalinity, prompting alterations in hydration product types and subsequent reduction in CSA strength. Conversely, Mg2+ was observed to ameliorate the microstructure of CSA test blocks, diminishing porosity and augmenting strength.

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“…Research on chemical shrinkage in cements has focused on the influence of additions such as cellulose nanofibrils [10], nanosilica [11], glass powder [12], ye'elimite [13], calcium sulphoaluminate cements [14] and limestone-calcined clay cements [15], which indicates that this is an area of active investigation and importance.…”

Section: Introductionmentioning

confidence: 99%

Predicting Chemical Shrinkage in Hydrating Cements

2022

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This paper presents a prediction of chemical shrinkage volume created during the hydration of two cements over time using a thermodynamic model. Chemical shrinkage in hydrating cements is a result of internal volume change over time within sealed conditions due to exothermic reactions during hydration and the resulting precipitation of solid hydrates. Each precipitated phase will contribute to chemical shrinkage due to their individual reactions and stoichiometric properties. As these factors (including early age, drying and autogenous nature) contribute to the overall shrinkage of concrete which may cause long-term performance problems, they are important properties to understand. The current paper presents a thermodynamic model that quantifies the chemical shrinkage volume created during the first 1000 days of hydration using the cemdata18 database and a series of discrete solid phases (DSPs) to represent C-S-H, which has not been quantified in the literature to date. DSPs account for the amorphous and poorly crystalline nature of C-S-H in cement, and its incongruent dissolution behavior of C-S-H as calcium is released in solution more so than silicon. A description of chemical shrinkage in hydrating cements is provided, along with a review of past methods used to quantify its development over time. The paper also shows the linear relationship between chemical shrinkage and the overall degree of hydration.

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Shrinkage characteristics of calcium sulphoaluminate cement concrete

Cited by 24 publications

References 27 publications

Study on the Strength, Permeability, and Drying Shrinkage of Mortar with Portland Cement and Sulphoaluminate Cement

Study on the Strength, Permeability, and Drying Shrinkage of Mortar with Portland Cement and Sulphoaluminate Cement

Investigation on the Impacts of Three Sea Salt Ions on the Performance of CSA-OPC Binary System

Predicting Chemical Shrinkage in Hydrating Cements

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