Recent progress and technical challenges in using calcium sulfoaluminate (CSA) cement

Tao, Yaxin; Rahul, A.V.; Mohan, M.; Schutter, Geert De; Tittelboom, Kim Van

doi:10.1016/j.cemconcomp.2022.104908

Cited by 43 publications

(9 citation statements)

References 171 publications

(228 reference statements)

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“…In the latter case, the risk of pipe blockage is reduced because the accelerator is not premixed. Nevertheless, the accurate dosing of the accelerator into fresh cement-based materials remains challenging [22,23]. The second objective is to formulate a 3D printable mixture with excellent adhesion properties in both fresh and hardened states, thus preventing detaching failures at the interface.…”

Section: Challengesmentioning

confidence: 99%

3D concrete printing for tunnel linings: Opportunities and challenges

Tao,

Yuan

2024

IOP Conf. Ser.: Earth Environ. Sci.

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The use of shotcrete for hard rock tunnel linings has drawbacks such as irregular surfaces and rebounds. By contrast, extrusion-based 3D concrete printing presents a promising solution with precise deposition and reduced rebound. This study discusses the potential of 3D printing for tunnel linings, focusing on mitigating shear failure and addressing interfacial detachment. Achieving high strength early for stable adhesion to rock surfaces is paramount for countering shear failure. A twin-pipe pumping system was introduced utilizing a helical static mixer to blend concrete involving chemical triggers, effectively managing the stiffness and fluidity during pumping. In addition, the adhesion to the substrate must be addressed. Based on the above discussion, this study offers insights into the fundamental challenges, paving the way for advancing extrusion-based 3D concrete printing for tunnel linings.

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Section: Challengesmentioning

confidence: 99%

3D concrete printing for tunnel linings: Opportunities and challenges

Tao,

Yuan

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…Calcium sulfoaluminate cement (CSA), considered as a green cement, is nowadays attracting more attention in the cement industry. This cement has already been used in China since 1970 in specific applications where rapid setting, early setting, and shrinkage compensation are required [ 1 , 2 , 3 , 4 , 5 , 6 ]. However, after the KYOTO conference, CSA has found its way to the European market.…”

Section: Introductionmentioning

confidence: 99%

Managing the Heat Release of Calcium Sulfoaluminate Cement by Modifying the Ye’elimite Content

et al. 2023

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Nowadays, calcium sulfoaluminate cement (CSA) is garnering a large amount of attention worldwide and is being promoted as a sustainable alternative to Portland cement for specific applications. This study aimed to control the heat release of CSA cement paste by choosing the appropriate composition. For this purpose, different calcium sulfoaluminate clinkers with up to 75 wt. % of ye’elimite were synthetized. Then, a reactivity study on the synthesized clinkers was conducted while varying the amount of gypsum added. The heat of hydration was measured by isothermal calorimetry. The influence of the ye’elimite content on the heat release and on the compressive strength was investigated. According to the findings, the amount of ye’elimite in the cement has a direct relationship with the heat release. The heat release as well as the mechanical performance increase with the increase in the ye’elimite content in the CSA cement. An equation allowing the prediction of the total heat release after 24 h is provided. Such data can be of particular interest to consultants aiming at the reduction of thermal cracking in massive concrete.

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“… Calcium sulfoaluminate cements (CSA), have as main phases ye’elimite (

) and belite (

). A feature to highlight in this type of cement is that they have a low carbon footprint [ 21 , 22 , 23 ]. …”

Section: Introductionmentioning

confidence: 99%

New Approach to Determine the Activity Concentration Index in Cements, Fly Ashes, and Slags on the Basis of Their Chemical Composition

et al. 2023

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The manufacture of Portland cement entails high energy and environmental costs, and various solutions have been implemented in recent years to mitigate this negative impact. These solutions include improvements in the manufacture of cement clinker or the use of supplementary cementitious materials (SCMs), such as fly ash (FA) or slag as a replacement for a portion of the clinker in cement. The incorporation of these SCMs in cement may increase its radiological content as they are naturally occurring radioactive materials (NORMs). The Activity Concentration Index (ACI) is a screening tool established in the European EURATOM Directive 2013/59 to determine the radiation protection suitability of a final construction material. The ACI is determined by the activity concentrations of 226Ra, 232Th and 40K, usually determined by gamma spectrometry. The methodology of gamma spectrometry is accurate and appropriate, but this technique is not available in all laboratories. For this reason, and taking into account that there is a relationship between the chemical and radiological composition of these building materials, a new approach is proposed to determine the radiological content of these materials from a chemical analysis such as X-ray fluorescence (XRF). In this paper, principal component analysis (PCA) is used to establish the relationships between the chemical composition and radiological content of cements, FAs, and slags of different natures. Through PCA it was possible to group the cements based on two variables: CaO content and Fe2O3–Al2O3–TiO2 content. A lower correlation was observed for the FAs and slags, as the sample scores were centered around the origin of the coordinates and showed greater dispersion than the cements. The clusters obtained in the HJ–Biplots allowed the determination, using multiple regression, of models relating the activity concentration of 226Ra, 232Th (212Pb), and 40K to the oxide percentages obtained for the three matrices studied. The models were validated using five cements, one FA and one slag with relative percentage deviations (RSD(%)) equal to or less than 30% for 89% of the activity concentrations and 100% of the ACI determined.

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Recent progress and technical challenges in using calcium sulfoaluminate (CSA) cement

Cited by 43 publications

References 171 publications

3D concrete printing for tunnel linings: Opportunities and challenges

3D concrete printing for tunnel linings: Opportunities and challenges

Managing the Heat Release of Calcium Sulfoaluminate Cement by Modifying the Ye’elimite Content

New Approach to Determine the Activity Concentration Index in Cements, Fly Ashes, and Slags on the Basis of Their Chemical Composition

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