Use of calcium sulfoaluminate cements for setting control of 3D-printing mortars

Khalil, Noura; Aouad, G.; Cheikh, Khadija El; Rémond, Sébastien

doi:10.1016/j.conbuildmat.2017.09.109

Cited by 212 publications

(102 citation statements)

References 24 publications

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“…Admixtures are added to the mix to accelerate the setting process, thereby increasing the capacity of the printed layer to bear the weight of the layers above (or to increase buildability). Khalil et al [13] studied the effect of adding an admixture in concrete mix on the evolution of buildability of printed concrete. Two binders were considered: 1) 100% OPC, and 2) 93% OPC mixed with 7% calcium sulpho-aluminate by weight.…”

Section: Evolution Of Buildabilitymentioning

confidence: 99%

“…There is no widely accepted definition of buildability. Maximum number of free-standing layers (e.g., [8]), compressive strength of a freshly-printed specimen (e.g., [9,11]), ultrasonic pulse velocity through a freshly-printed specimen (e.g., [12]), and depth of penetration of Vicat plunger into freshly-printed concrete layers [13] have been considered as measures of the buildability in the past. A parameter related to buildability is shape stability, which refers to the similarity between the achieved and intended dimensions of a printed specimen.…”

Section: Introductionmentioning

confidence: 99%

“…A challenge in printing the SCC, however, is to ensure that a printed layer achieves the capacity to support the layers above in a reasonable time frame. The initial strength gain of the SCC can be accelerated using chemical admixtures (e.g., calcium sulpho-aluminate, calcium chloride, calcium aluminate and sodium sulphate [9,13,21,[32][33][34][35][36][37][38][39]). However, the admixtures may cause choking in the printing set-up due to accelerated setting, lead to expansive hydration reaction [40], produce high heat of hydration [41], and/or have chemicals that can accelerate corrosion in reinforcement.…”

Section: Introductionmentioning

confidence: 99%

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Additive manufacturing of self-compacting concrete through controlled heating

Shekhar¹,

Kumar²,

Mathur³

2020

Preprint

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Construction using concrete through additive manufacturing is gaining attention. This approach involves a layer-wise deposition of concrete. A layer of printed concrete needs to be ``strong" enough to sustain the weight of layers to be printed above. These layers may not bond well with each other, however. Self-compacting concrete (SCC) may lead to a better bonding, but it may not have sufficient strength. This paper presents a method to print SCC through controlled heating. Properties of printed concrete in fresh and hardened states are studied. Heating leads to a sharp rise in the strength of freshly-printed concrete layers, but a long duration of heating may lead to a reduction in strength of printed concrete after hardening particularly if water-to-cement ratio is small or if loads are applied parallel to the printed layers.

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Section: Evolution Of Buildabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Additive manufacturing of self-compacting concrete through controlled heating

Shekhar¹,

Kumar²,

Mathur³

2020

Preprint

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“…Moreover, they can cause instability and affect the quality of the foam concrete. In some studies, different types of cement characterised by rapid setting were utilized [24,25]. Rapidhardening Portland cement is often used to reduce the risks of instability and segregation and to ensure that foam concrete will develop a strong homogeneous microstructure at a very early stage.…”

Section: Introductionmentioning

confidence: 99%

Material Design and Performance Evaluation of Foam Concrete for Digital Fabrication

Markin

Nerella

Schröfl

et al. 2019

Preprint

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3D-printing with foam concrete, which is known for its distinct physical and mechanical properties, has not yet been purposefully investigated. The article at hand presents a methodological approach for the mixture design of 3D-printable foam concretes and a systematic investigation of the potential application of this type of material in digital construction. Three different foam concrete compositions with water-to-binder ratios between 0.33 and 0.36 and having densities of 1100 to 1580 kg/m³ in the fresh state were produced with a pre-foaming technique using a protein-based foaming agent. Based on the fresh-state tests, including 3D-printing as such, an optimum composition was identified and its compressive and flexural strengths were characterised. The printable foam concrete showed compressive strength above 10 MPa and low thermal conductivity, which make it suitable for 3D-printing applications, while fulfilling both load-carrying and insulating functions.

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“…Sulphoaluminate cement could be used as an accelerator. In the work [6] a mixture of ordinary Portland cement (93%) with a sulphoaluminate cement additive (7%) is studied as a working material for a building 3D printer. The use of sulphoaluminate cement reduces the start and the end of setting.…”

Section: Introductionmentioning

confidence: 99%

Study of strength kinetics of sand concrete system of accelerated hardening

Sharanova

Lenkova

Kogai

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Methods of calorimetric analysis are used to study the dynamics of the hydration processes of concretes with different accelerator contents. The efficiency of the isothermal calorimetry method is shown for study of strength kinetics of concrete mixtures of accelerated hardening, promising for additive technologies in civil engineering. IntroductionNowadays the use of additive technologies in construction industry is one of the most actual subjects of research. Growth of interest in such technologies in construction is conditioned by a number of factors: high level of production automation, improvement of production quality, acceleration of creation processes, possibility of optimization of CAD models, reduction of production wastes [1]. These factors represent a great interest for the application of additive technologies in civil engineering and use of 3D prototyping in place of the traditional methods of construction.The main problem for the use of additive technologies in construction is the materials used, since the ordinary concrete does not meet the requirements of 3D printing productivity [2]. Special composition for building printing should harden quickly enough to withstand the weight of subsequently deposited layers without deformation. Composites that harden for a long time slow down the process of erecting the building and cannot meet the requirements of 3D printing productivity [1]. There is a need to select and determine the optimal composition of accelerating additives to reduce the setting time of the concrete mixture.A large number of recent works on the control of setting time show the relevance of this subject of research. Shakor P [3] uses a printed composition based on a mixture of ordinary Portland cement (32.2%) and high aluminate cement (67.8%) with the addition of a lithium carbonate accelerator (4.5%). Lithium carbonate provides hardening acceleration, high early strength and good adhesion. Kazemian A et al [4] examine the effect of the accelerating additive based on calcium chloride on the workability of the concrete mixture for the building 3D printer. It is noted that increasing the dose of accelerator from 2% to 3% has no significant effect on the loss of workability of concrete in the first 90 minutes after the preparation of the mixture. In addition to the accelerators, retarders of setting time are also widely used to maintain the concrete mixture in the liquid state for the time necessary for the extrusion of the material. Retarders and accelerators of the setting time are added at different stages of production [5]. Sulphoaluminate cement could be used as an accelerator. In the work [6] a mixture of ordinary Portland cement (93%) with a sulphoaluminate cement additive (7%) is studied as a working

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Use of calcium sulfoaluminate cements for setting control of 3D-printing mortars

Cited by 212 publications

References 24 publications

Additive manufacturing of self-compacting concrete through controlled heating

Additive manufacturing of self-compacting concrete through controlled heating

Material Design and Performance Evaluation of Foam Concrete for Digital Fabrication

Study of strength kinetics of sand concrete system of accelerated hardening

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