Effect of Structural Build-Up on Interlayer Bond Strength of 3D Printed Cement Mortars

Pan, Tinghong; Jiang, Yi-Rong; He, Hui; Wang, Yu; Yin, Kangting

doi:10.3390/ma14020236

Cited by 37 publications

(10 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calculation results of RST (the first derivative of static yield stress with time) over time in 10 printed mortar groups are shown in Figure 13 . It can be observed that the turning point at which the RST of cement-based materials decreases sharply, meaning the transition point of the materials’ state if changing from physical flocculation to chemical structuration, which represents the duration time of the physical flocculation process and corresponds to the maximum operational time in the mortar [ 31 ]. Once the maximum operating time of materials is exceeded, the materials should not continue to be printed, otherwise it will result in interlayer voids that can decrease the durability of specimens [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The Synergistic Effect of Ester-Ether Copolymerization Thixo-Tropic Superplasticizer and Nano-Clay on the Buildability of 3D Printable Cementitious Materials

et al. 2021

Self Cite

View full text Add to dashboard Cite

The shape retention ability of materials deposited layer by layer is called buildability, which is an indispensable performance parameter for successful 3D printable cementitious materials (3DPC). This study investigated the synergistic effect of nano-clay (NC) and thixotropic superplasticizer (TP) on the buildability of 3DPC. The rheological parameters and static yield stress are characterized by the rheology testing, the green strength is measured by a self-made pressure tester, and the fluidity is tested by flow table. Results indicate that NC significantly increases the growth rate of static yield stress and green strength and TP can improve the initial rheological parameters and fluidity, which ensures the initial stiffness and workability of printed materials. The mixture with 7‰ (by mass of cementitious materials) NC and 3‰ TP obtains excellent extrudability and buildability, due to the synergistic effect of NC and TP. Based on the rheology testing and specific printing experiments, a printable window with 1.0 Pa/s~2.0 Pa/s of the rate of static yield stress evolution over time (RST) or 170 mm~200 mm of fluidity is established. This work provides theorical support for the control and evaluation of rheological properties in 3DPC.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The gel permeation chromatograph (GPC) results of TP and PCE have been obtained in a previous group work and are briefly presented here [ 31 ]. The weight-average molecular weight and number-average molecular weights of TP polymer are 46,960 g/mol and 23,863 g/mol, respectively.…”

Section: Materials and Methodologymentioning

confidence: 99%

The Synergistic Effect of Ester-Ether Copolymerization Thixo-Tropic Superplasticizer and Nano-Clay on the Buildability of 3D Printable Cementitious Materials

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…e weak surface between layers will lead to uncoordinated deformation and discontinuous mechanical properties of the structure, which is prone to fracture due to stress concentration. It is another major molding defect in the concrete 3D printing process [48,49].…”

Section: Weak Surface Between Layersmentioning

confidence: 99%

Research Progress of Concrete 3D Printing Technology and Its Equipment System, Material, and Molding Defect Control

Yan-hua

Meng

Wang

et al. 2022

Journal of Engineering

View full text Add to dashboard Cite

The traditional construction technology not only has environmental friendly problems such as noise and dust but also has resource-saving problems such as large template quantity and low construction accuracy. In addition, the traditional construction technology has an insurmountable technical bottleneck in the construction of special-shaped buildings. Building 3D printing technology can effectively overcome many problems existing in traditional construction technology and provide unlimited possibilities for the construction of special-shaped buildings. Concrete 3D printing technology is one of the most important technical categories of building 3D printing. In this study, the research status and progress of concrete 3D technology were reviewed from the aspects of equipment system, materials, defect control, and application scenarios. On this basis, the development foreground was prospected.

show abstract

“…6,7 Thixotropy is crucial to the workability of self-compacting concrete (SCC). 3,[8][9][10] The thixotropic property of SCC largely determines the characteristics of filling formwork, formwork pressure, segregation resistance, and so on. SCC will be affected by high shear rate in the process of production, transportation by mixer truck and treatment at construction site.…”

Section: Introductionmentioning

confidence: 99%

“…The thixotropic index (I thix = τ i /τ e ) was used by Qian and De Schutter 14 to analyze the gap between initial shear stress (τ i ) and equilibrium shear stress (τ e ). Panda et al 10,15 proposed the dimensionless parameter (λ = (τ i À τ e )/τ e ) to characterize the thixotropic properties of fresh cementbased materials. Santos et al 16 tested the viscosity recovery using a three-interval thixotropy method to assess the thixotropic properties of fresh cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

Characterization of thixotropic properties of fresh cement‐based materials

Ji,

Pan,

Liu

et al. 2023

Structural Concrete

Self Cite

View full text Add to dashboard Cite

Accurate evaluation of the thixotropy of mixtures is crucial for the design and production of self‐compacting concrete, pumped concrete, and 3D printed concrete. However, there is no uniform standard for the assessment of the thixotropy of fresh cement‐based materials. In this paper, four widely used test procedures (thixotropic index, static yield stress growth curve, thixotropic hysteresis loop area, and three‐stage curve) are compared to determine the relationships between them. The results show that the test procedures based on the break‐down (destruction) process (thixotropic index, thixotropic hysteresis loop area, and degree of breakdown) are difficult to distinguish between reversible and irreversible thixotropic structures and to accurately assess the thixotropy of mixtures. The short‐term structural build‐up rate Rthix is more suitable for characterizing the thixotropic properties. The three‐stage curve can characterize both the degree of structural damage and the reconstruction ability of the paste, nano‐attapulgite clay can significantly improve the structural recovery degree of the mixture at the early hydration stage. This study will provide guidance and a theoretical framework for choosing the thixotropic characterization method of cement‐based materials in practical engineering applications.

show abstract

Effect of Structural Build-Up on Interlayer Bond Strength of 3D Printed Cement Mortars

Cited by 37 publications

References 43 publications

The Synergistic Effect of Ester-Ether Copolymerization Thixo-Tropic Superplasticizer and Nano-Clay on the Buildability of 3D Printable Cementitious Materials

The Synergistic Effect of Ester-Ether Copolymerization Thixo-Tropic Superplasticizer and Nano-Clay on the Buildability of 3D Printable Cementitious Materials

Research Progress of Concrete 3D Printing Technology and Its Equipment System, Material, and Molding Defect Control

Characterization of thixotropic properties of fresh cement‐based materials

Contact Info

Product

Resources

About