Rheological and mechanical properties of admixtures modified 3D printing sulphoaluminate cementitious materials

Chen, Mingxu; Li, Laibo; Zheng, Yan; Zhao, Piqi; Lu, Lingchao; Cheng, Xin

doi:10.1016/j.conbuildmat.2018.09.037

Cited by 138 publications

(29 citation statements)

References 27 publications

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“…Over time, the AFt layer began to be ruined and then the second peak occurred. These two steps were repeated and the hydration of CSA continued [ 53 ]. In Figure 5 a, it was found that both RCS and WGCS had no obvious effect on the first peak.…”

Section: Resultsmentioning

confidence: 99%

Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Tan

et al. 2020

Materials

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In this study, wet-ground carbide slag (i.e., WGCS) was utilized as an accelerator in calcium sulfoaluminate cement (CSA) for obtaining considerably faster setting processes for some special engineering processes such as plugging projects and rapid repair engineering. The WGCS–CSA system was designed, in which the replacement ratio of CSA by carbide slag was chosen as 4%, 8% and 12%. The setting time and compressive strength were measured, and the mechanism of the system hydration was studied in detail by means of calorimetry, XRD, thermogravimetry (TG) and SEM. The results showed that WGCS shortened the setting time of cement and significantly augmented the early strength. The addition of 8% of WGCS contributed to increasing the 2-h compressive strength from 4.2 MPa to 32.9 MPa. The decrease in the setting time and the increase in the initial strength were mainly attributed to the high initial pH value of the liquid phase and the high content of calcium ions in WGCS. Both these factors contributed to the ettringite formation and, at the same time, to the transformation of the morphology at a later time. Such results testify that WGCS can be used as an accelerator in the CSA system and also that it provides a novel approach to the reutilization of carbide slag.

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Section: Resultsmentioning

confidence: 99%

Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Tan

et al. 2020

Materials

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“…The purpose of selecting the smooth stage in the curve is to eliminate the instability of the slurry caused by the low shear rate. [31] The higher R 2 value indicates a satisfactory correlation between the experimental and the fitted values. The summary of the yield stress and plastic viscosity with different sorbitol dosages (0~0.45%) is depicted in Fig.…”

Section: Fluidity and Rheological Behaviormentioning

confidence: 95%

“…As a kind of cement paste, polymer-modified cementbased coating belongs to a non-Newtonian fluid. [31] When the shear rate increases, obvious shear thinning occurs in the coating system. Fig.…”

Section: Fluidity and Rheological Behaviormentioning

confidence: 99%

Investigation of Compatibility of Fluorine-Acrylic Emulsion and Sulphoaluminate Cement in the Design of Composite Coating: Effects of Sorbitol and Its Mechanism

Chen¹,

Piqi²,

Hou³

et al. 2020

ES Mater.Manuf.

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Both fluorine-acrylic (FA) emulsion and sulphoaluminate cement (CSA) have been proved as satisfactory marine engineering materials, and a better performance can be expected by their combined use. However, their compatibility has rarely been researched. In this study, the effects of sorbitol and its mechanism are investigated by the cement paste fluidity, rheological property, tensile strength, water absorption and scanning electron microscopy (SEM) tests. The results showed that, compared with sodium tripolyphosphate, borax and sodium gluconate, sorbitol can significantly improve the double electric layer of FA, and the absolute value of Zeta potential was increased by 25% compared with the blank sample without any retarder added. With the increase of sorbitol dosage, the fluidity, rheological behavior, tensile strength and water absorption sharply changed first and then tended to be stable after sorbitol dosage reached the optimal dosage of 0.25% for the compatibility improvement. The morphology analysis also proved its advantages, but the more significant improvement can be ensured by a larger polymer to cement ratio (p/c) value. Finally, the mechanism hypothesis is proposed. The film formation rate of the emulsion matches the hydration rate of the cement, due to sorbitol addition.

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“…The first group to be explored is magnesium-based binders (magnesium oxychloride cement (MOC) and magnesium phosphate cement (MPC)) that have been shown to have good compatibility with bio-based fillers and high early strength [14,15] but have not been extensively used for 3D printing previously. The second group is calcium sulfoaluminate (CSA) cements, which have been used for 3D printing applications due to their fast setting [16] but have not been studied comprehensively. These cements have a lower CO 2 footprint than OPC [17].…”

Section: Introductionmentioning

confidence: 99%

Fast Setting Binders for Application in 3D Printing of Bio-Based Building Materials

et al. 2020

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The construction industry is one of the largest emitters of CO2 because the production of traditional building materials is highly energy-intensive and uses considerable amounts of raw materials. This research aims to decrease the negative environmental impact of the construction industry by providing biocomposites with a low environmental impact due to their bio-based components and efficient use of the materials through 3D printing. Agricultural waste products—hemp shives—are used in these materials as a filler together with three different types of fast-setting binders—magnesium, calcium sulphoaluminate (CSA) and those that are gypsum-based. The study determines the setting time and compressive strength of these binders, as well as the formation of biocomposites of different densities for different applications; extrusion tests and preliminary life cycle assessment (LCA) are also performed. Results show that biocomposites with hemp shives and fast setting binders have a possible application in 3D printing due to their shape stability and buildability, as well as relatively high compressive strength, which allows for load-bearing use at high densities and thermal insulation use at low densities, although printability at low binder content remains a significant challenge. Preliminary LCA results show that CSA and gypsum binders have the lowest environmental impact from the binders considered.

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Rheological and mechanical properties of admixtures modified 3D printing sulphoaluminate cementitious materials

Cited by 138 publications

References 27 publications

Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Investigation of Compatibility of Fluorine-Acrylic Emulsion and Sulphoaluminate Cement in the Design of Composite Coating: Effects of Sorbitol and Its Mechanism

Fast Setting Binders for Application in 3D Printing of Bio-Based Building Materials

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