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学者姓名：罗素蓉
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Abstract ：
3D printing concrete (3DPC) technology is a relatively new and rapidly developing technology in the construction industry recently, often employing the addition of external fibers to enhance its rheological and mechanical properties. Polyoxymethylene (POM) fibers have a broad research prospect due to their good compatibility with inorganic materials and resistance to alkali. This study investigates the rheological and mechanical properties of 3D-printed high-strength concrete which contain POM fibers. The study examines the effects of POM fiber volume fraction (1.5 %, 2 %, 2.5 %) and fly ash content (0 %, 10 %, 20 %) on the rheological and mechanical properties of 3D-printed concrete, and evaluates the yield stress and plastic viscosity at different volume fractions, and the effects of different fiber contents on compressive and flexural strength were evaluated through compression and bending tests. The study also characterizes the microstructure using scanning electron microscopy. The results show that POM fibers will significantly improve rheological parameters, and fly ash will effectively improve rheology, making 3DPC able to meet the requirements of workability. The maximum enhancement in compressive and flexural strength were both observed at 2 % POM fiber volume, providing optimal balance between rheology and strength. In addition, the effect of fiber orientation arrangement on strengthening compressive and flexural strength was proved by microscopic tests. These results can provide an important experimental reference for evaluating the rheological and mechanical properties of 3Dprinted fiber-reinforced concrete.
Keyword ：
3D-printed concrete 3D-printed concrete Mechanical properties Mechanical properties Microstructure Microstructure Polyformaldehyde fibers Polyformaldehyde fibers Rheology Rheology
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| GB/T 7714 | Luo, Surong , Jin, Wenhao , Wu, Weihong et al. Rheological and mechanical properties of polyformaldehyde fiber reinforced 3D-printed high-strength concrete with the addition of fly ash [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 98 . |
| MLA | Luo, Surong et al. "Rheological and mechanical properties of polyformaldehyde fiber reinforced 3D-printed high-strength concrete with the addition of fly ash" . | JOURNAL OF BUILDING ENGINEERING 98 (2024) . |
| APA | Luo, Surong , Jin, Wenhao , Wu, Weihong , Zhang, Kaijian . Rheological and mechanical properties of polyformaldehyde fiber reinforced 3D-printed high-strength concrete with the addition of fly ash . | JOURNAL OF BUILDING ENGINEERING , 2024 , 98 . |
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3D printed cement-based materials decreases interstrip contact surface properties due to the stack molding process. Metakaolin can reduce porosity and improve mechanical property, but its high water demand cause water loss on the surface of printing strip, and the interlayer bonding performance decline. Limestone powder has a dilution effect, which can improve the high water demand of metakaolin. The influences of metakaolin and mixed limestone powder on anisotropic performance of 3D printed cement-based materials were studied, and the mechanism from a microscopic perspective was explained. The results show that the optimal mass content of metakaolin is 12%, and the optimal mixing mass ratio is m(metakaolin) ∶ m(limestone powder) is 2 ∶ 1. After adding metakaolin, the fluidity of 3D printed cement-based materials decreases significantly, the fluidity of mixed limestone powder increases. The compressive strength of 3D printed test block is characterized by X > Z > Y > molding, and the variation pattern of flexural strength in different directions is basically the same as the compressive strength, with anisotropic characteristics. © 2024 Bulletin of the Chinese Ceramic Society Press. All rights reserved.
Keyword ：
3D printing 3D printing anisotropy anisotropy compressive strength compressive strength flexural strength flexural strength limestone powder limestone powder metakaolin metakaolin
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| GB/T 7714 | Zhang, Z. , Luo, S. , Lin, X. . Anisotropic of 3D Printed Cement-Based Materials Reinforced with Metakaolin and Limestone Powder; [偏高岭土与石灰石粉增强 3D 打印水泥基材料的各向异性研究] [J]. | Bulletin of the Chinese Ceramic Society , 2024 , 43 (5) : 1651-1662 . |
| MLA | Zhang, Z. et al. "Anisotropic of 3D Printed Cement-Based Materials Reinforced with Metakaolin and Limestone Powder; [偏高岭土与石灰石粉增强 3D 打印水泥基材料的各向异性研究]" . | Bulletin of the Chinese Ceramic Society 43 . 5 (2024) : 1651-1662 . |
| APA | Zhang, Z. , Luo, S. , Lin, X. . Anisotropic of 3D Printed Cement-Based Materials Reinforced with Metakaolin and Limestone Powder; [偏高岭土与石灰石粉增强 3D 打印水泥基材料的各向异性研究] . | Bulletin of the Chinese Ceramic Society , 2024 , 43 (5) , 1651-1662 . |
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To explore the flexural fatigue performance of steel fibers reinforced recycled aggregate concrete (SF-RAC), the flexural fatigue test and residual strength test with different stress levels were conducted. Besides, the fatigue cracks propagation under cyclic loading were observed and analyzed by digital image correlation (DIC) technology. The results show that the flexural fatigue life of SF-RAC increases when the content of steel fibers increases, and it is proved to be well in accordance with the three-parameter Weibull distribution. The flexural fatigue life equation with different stress level and reliability (S-N-P equation) is obtained based on it, which shows that when the fiber volume content is 1.5%, the fatigue strength of SF-RAC is about 37.2% higher than that of RAC without fibers. Then, a fatigue strain-based damage evolution model is established, and the derived residual strength model can well predict the damage degree and residual life of SF-RAC. Moreover, the steel fibers can improve the critical crack propagation length and loading cycles of RAC. The crack propagation rate can be decreased by 97.63% when the fiber volume content is 1.5%, and it is increased with the development of stress level. Finally, the influence mechanism of steel fibers on flexural fatigue performance of RAC were explained through microstructure tests.
Keyword ：
Crack propagation rate Crack propagation rate Digital image correlation (DIC) Digital image correlation (DIC) Flexural fatigue performance Flexural fatigue performance Recycled aggregate concrete (RAC) Recycled aggregate concrete (RAC) Steel fibers Steel fibers Three -parameter Weibull distribution Three -parameter Weibull distribution
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| GB/T 7714 | Luo, Surong , Su, Yongqing , Zhang, Qingtian et al. Effects of steel fibers on the flexural fatigue performance of recycled aggregate concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 412 . |
| MLA | Luo, Surong et al. "Effects of steel fibers on the flexural fatigue performance of recycled aggregate concrete" . | CONSTRUCTION AND BUILDING MATERIALS 412 (2024) . |
| APA | Luo, Surong , Su, Yongqing , Zhang, Qingtian , Zhang, Kaijian . Effects of steel fibers on the flexural fatigue performance of recycled aggregate concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 412 . |
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To solve the problem of the lack of structural design basis of fiber reinforced recycled aggregate concrete (FRAC), and promote its realistic application, in this investigation, the replacement ratio of recycled coarse aggregate (RCA), fiber type, fiber content, and fiber blending forms are taken as experimental variables. With the size of Phi 100 mmx300 mm, 21 groups of cylindrical specimens are designed to study the influence of the above variables on the complete stress-strain curve of fiber RAC when bearing uniaxial tension. The results show that the tensile characteristic values decrease as the replacement ratio of RCA increases. When single doping of fibers was considered, the tensile characteristic values increased as fiber content increased. When the steel (SF) was mixed with polyvinyl alcohol fiber (PVAF) and polypropylene fiber (PPF), the tensile characteristic values were improved. Proper blending of PVAF and PPF can improve the characteristic values of tensile ductility. Through the results of the uniaxial tensile experiment, constitutive equations of the uniaxial tensile stress-strain curve of FRAC under different test variables were established, which can provide fundamental material parameters to design FRAC structures.
Keyword ：
Constitutive relationship Constitutive relationship Fiber Fiber Recycled aggregate concrete (RAC) Recycled aggregate concrete (RAC) Uniaxial tensile stress-strain curve Uniaxial tensile stress-strain curve
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| GB/T 7714 | Luo, Surong , Zhou, Wentao , Yu, Minming et al. Stress-strain relationship of fiber reinforced recycled aggregate concrete under uniaxial tension [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 422 . |
| MLA | Luo, Surong et al. "Stress-strain relationship of fiber reinforced recycled aggregate concrete under uniaxial tension" . | CONSTRUCTION AND BUILDING MATERIALS 422 (2024) . |
| APA | Luo, Surong , Zhou, Wentao , Yu, Minming , Zhang, Kaijian , Zhang, Qingtian . Stress-strain relationship of fiber reinforced recycled aggregate concrete under uniaxial tension . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 422 . |
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Abstract ：
3D打印水泥基材料堆叠成型的工艺导致其条间接触面性能下降，偏高岭土的加入能够使材料孔隙率降低，力学性能提高，但偏高岭土的高需水性会造成打印条带表面水分损失，层间黏结性能下降，而石灰石粉的稀释效应可以改善这一点。本文研究了复掺偏高岭土与石灰石粉对3D打印水泥基材料各向异性的影响，并通过微观角度解释这两种材料影响力学性能的机理。结果表明，偏高岭土最佳质量掺量为12%,最佳复掺质量比例m(偏高岭土)∶m(石灰石粉)为2∶1,3D打印水泥基材料掺入偏高岭土后流动度显著下降，复掺石灰石粉后流动度提高。3D打印试块各方向抗压强度的大小为X>Z>Y>筑模，不同方向抗折强度变化规律与抗压强度基本相同，具有各向异性特征。
Keyword ：
3D打印 3D打印 偏高岭土 偏高岭土 各向异性 各向异性 抗压强度 抗压强度 抗折强度 抗折强度 石灰石粉 石灰石粉
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| GB/T 7714 | 张钊睿 , 罗素蓉 , 林欣 . 偏高岭土与石灰石粉增强3D打印水泥基材料的各向异性研究 [J]. | 硅酸盐通报 , 2024 , 43 (05) : 1651-1662,1682 . |
| MLA | 张钊睿 et al. "偏高岭土与石灰石粉增强3D打印水泥基材料的各向异性研究" . | 硅酸盐通报 43 . 05 (2024) : 1651-1662,1682 . |
| APA | 张钊睿 , 罗素蓉 , 林欣 . 偏高岭土与石灰石粉增强3D打印水泥基材料的各向异性研究 . | 硅酸盐通报 , 2024 , 43 (05) , 1651-1662,1682 . |
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Economic and environmentally friendly polypropylene (PP) fibre and polyvinyl alcohol (PVA) fibre were found to be beneficial to the strength of recycled coarse aggregate concrete (RCAC), but the effects in the fracture properties of the RCAC has been overlooked. This study added PP fibre and PVA fibre to enhance the ability of the RCAC to resist crack instability expansion. The three-point bending tests were performed to compare the fracture properties of the RCAC with fibres and without fibre. The reinforcement mechanism of fibres was analyzed by the single-fibre pullout tests and scanning electron microscopy tests. The experimental results indicated that fibres could not effectively increase the compressive strength of RCAC but the splitting tensile strength of RCAC was significantly improved with the increase of the volume fraction of fibres and the optimal volume fraction of fibre was 1.5% PP fibre. The PP fibre and PVA fibre both effectively improved the fracture properties of RCAC but acted in the post-cracking stage and the linear loading stage, respectively. As a concrete manifestation of the PP fibre was more effective in increasing the peak load, unstable toughness, and fracture energy of RCAC than the PVA fibre while the PVA fibre was more effective in increasing the initial cracking load and the initial toughness. The 1.0% PP fibre had the best effect on the fracture properties, which increased peak load, unstable toughness, and fracture energy by 47.2%, 42.3%, and 5500%, respectively. The 0.2% PVA has the best effect on the fracture properties of RCAC at the stage before the cracks developed which increased initial cracking load and initial toughness by 25.2% and 43.7%, respectively. In addition, the development of cracks of RCAC with PP fibre was more tortuous than that of RCAC with PVA fibre. A reinforcement mechanism analysis showed that there were obvious diamond-shaped depressions on the surface of PP fibre which provided mechanical interlock to enhance the RCAC. The hydrogen bonds of PVA fibre also enhanced the RCAC through the hydration products attached to the surface of the PVA but it is weaker than diamond-shaped depressions. These results provided theoretical and experimental support for the research gap of PP fibre and PVA fibre in RCAC.
Keyword ：
Crack propagation Crack propagation Fracture energy Fracture energy Fracture toughness Fracture toughness Mechanism analysis Mechanism analysis Polypropylene fibre Polypropylene fibre Polyvinyl alcohol fibre Polyvinyl alcohol fibre Recycled coarse aggregate concrete Recycled coarse aggregate concrete
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| GB/T 7714 | Lin, Qian , Luo, Surong , Lin, Kaida et al. Effects of synthetic fibres on the fracture behaviours of recycled coarse aggregate concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 418 . |
| MLA | Lin, Qian et al. "Effects of synthetic fibres on the fracture behaviours of recycled coarse aggregate concrete" . | CONSTRUCTION AND BUILDING MATERIALS 418 (2024) . |
| APA | Lin, Qian , Luo, Surong , Lin, Kaida , Wang, Dehui . Effects of synthetic fibres on the fracture behaviours of recycled coarse aggregate concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 418 . |
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为了提高聚乙烯醇(PVA)纤维增强水泥基材料的力学性能,将氧化石墨烯(GO)引入PVA纤维增强水泥基材料中,探究GO掺量在0%～0.05%范围内对材料单轴拉伸性能的影响.结果表明:掺入适量的GO能够有效提高材料的单轴拉伸性能,当GO掺量为0.01%时,28 d时材料的初裂拉伸强度、极限拉伸强度和极限拉伸应变均达到最大值,与未掺GO的对照组相比分别提高了26.97%、31.28%、23.25%;适量的GO可以优化孔隙结构,减少材料内部缺陷,促进水化产物的生成,使微观结构致密化,增强纤维和基体间的界面结合力,从而改善PVA纤维增强水泥基材料的宏观性能.
Keyword ：
单轴拉伸性能 单轴拉伸性能 微观性能 微观性能 氧化石墨烯 氧化石墨烯 水泥基材料 水泥基材料 聚乙烯醇(PVA)纤维 聚乙烯醇(PVA)纤维
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| GB/T 7714 | 罗素蓉 , 姚佳敏 , 周恩泉 et al. 氧化石墨烯改性纤维增强水泥基材料的拉伸性能 [J]. | 建筑材料学报 , 2024 , 27 (5) : 400-407 . |
| MLA | 罗素蓉 et al. "氧化石墨烯改性纤维增强水泥基材料的拉伸性能" . | 建筑材料学报 27 . 5 (2024) : 400-407 . |
| APA | 罗素蓉 , 姚佳敏 , 周恩泉 , 王世杰 . 氧化石墨烯改性纤维增强水泥基材料的拉伸性能 . | 建筑材料学报 , 2024 , 27 (5) , 400-407 . |
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To deepen the application and development of 3D Printing Construction Technology, the rheological characteristics, compressive strength and bending performance of 3D printed polyvinyl alcohol fiber (PVA fiber) reinforced cement-based material were explored. The direction of the intralayer interfaces and the fiber's distribution direction caused the anisotropy of 3D printed PVA fiber reinforced cement-based material. The printed specimens presented different failure patterns in different compressive directions, and there was certain anisotropy in the X, Y and Z directions. For the bending performance, the load-midpoint deflection curves of casted specimens and the Z(x) direction of printed specimens showed the strain hardening behavior, while the Z(y) direction of printed specimens did not. Compared with the Z(y) specimen, the bending strength of the Z(x) specimen was about 3 similar to 4 times higher, and the peak deflection was about an order of magnitude higher. The anisotropy of the printed specimen can be used to improve the bending performance in a specific loading direction to a certain extent.
Keyword ：
3D printing technology 3D printing technology Anisotropy Anisotropy Bending performance Bending performance Compressive strength Compressive strength Rheological characteristics Rheological characteristics
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| GB/T 7714 | Luo, Surong , Li, Wenqiang , Wang, Dehui . Study on bending performance of 3D printed PVA fiber reinforced cement-based material [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 433 . |
| MLA | Luo, Surong et al. "Study on bending performance of 3D printed PVA fiber reinforced cement-based material" . | CONSTRUCTION AND BUILDING MATERIALS 433 (2024) . |
| APA | Luo, Surong , Li, Wenqiang , Wang, Dehui . Study on bending performance of 3D printed PVA fiber reinforced cement-based material . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 433 . |
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The compressive strength data of 3D printed concrete (3DPC) in X (Print direction), Y (Adjacent stripes), and Z (Stacked stripes) were collected and analyzed to evaluate its anisotropic behavior and statistical parameters. Similar to conventional cast concrete, there is a linear relationship between the compressive strength of 3DPC and the binder-to-water ratio (B/W). For the normalized strength data, the average ratios of X/C, Y/C, and Z/C at 28 days are 0.87, 0.80, and 0.82 respectively, indicating a decrease in the compressive strength and anisotropy compared to cast concrete. Compared to the coefficient of variation (COV) of cast specimens mentioned in the specifications, there is an increase of 4.3–69 %. The weak interfaces and unique pore shapes in 3DPC interact to cause stress concentration and redistribution of internal stresses, resulting in decreased compressive strength, anisotropy, and variability. This investigation can provide material parameters for studying the structural performance of 3DPC components. © 2024
Keyword ：
3D printing 3D printing Anisotropy Anisotropy Compressive strength Compressive strength
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| GB/T 7714 | Zhang, Kaijian , Lin, Wenqiang , Zhang, Qingtian et al. Evaluation of anisotropy and statistical parameters of compressive strength for 3D printed concrete [J]. | Construction and Building Materials , 2024 , 440 . |
| MLA | Zhang, Kaijian et al. "Evaluation of anisotropy and statistical parameters of compressive strength for 3D printed concrete" . | Construction and Building Materials 440 (2024) . |
| APA | Zhang, Kaijian , Lin, Wenqiang , Zhang, Qingtian , Wang, Dehui , Luo, Surong . Evaluation of anisotropy and statistical parameters of compressive strength for 3D printed concrete . | Construction and Building Materials , 2024 , 440 . |
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Anisotropic mechanical characteristics are crucial to the application of the printed structure. This study is aimed to investigate the effects of interval time and interfacial agents on the anisotropic mechanical strength of ultra-high toughness cementitious composite under 3D-printed technology. The bending capacity of ultra-high toughness cementitious composite under 3D-printed technology was compared with mould-casting ultra-high toughness cementitious composite. The compressive strength, flexural strength and splitting tensile strength were measured to represent mechanical properties in different directions and the microstructure of ultra-high toughness cementitious composite under 3D-printed technology with different interval time and interfacial agents were characterized using nanoindentation, scanning electron microscopy, and X-ray computed tomog-raphy. The experimental results indicated that the ultimate bending strength and bending toughness of ultra-high toughness cementitious composite under 3D-printed technology were 13.6% and 3.3% to 13.3% higher than those of mould-casting ultra-high toughness cementitious composite at 28 d, respectively. As the interval time increased, the mechanical properties showed differential development patterns. Specifically, compressive strength and splitting tensile strength had a higher rate of decline in the X direction (parallel to the printing path) than in the Y and Z directions but flexural strength was the opposite. A 3-h interval time reduced the 28-d compressive strength and splitting tensile strength in the X direction by 24.02% and 49.64% but the strength only decreased by 10.57% and 26.59% in the Z-direction. The addition of interfacial agents reduced anisotropy in compressive strength and splitting tensile strength but increased the anisotropy of flexural strength. When the interval time was 3 h, the increase rate of the 28-d flexural strength in the X direction, in which the flexural strength was weakest, was 22%-29% lower than that in the Y and Z directions under the effects of interfacial agents. A microstructure analysis showed that the filling effect and high moisture content of interfacial agents counteracted the negative impact of interval time on the width of the interface between layers and the porosity of ultra-high toughness cementitious composite under 3D-printed technology, which can enhance the interlayer bonding. These results can promote the application of ultra-high toughness cementitious composite under 3D-printed technology in additive manufacturing.
Keyword ：
Anisotropic Anisotropic Interfacial agent Interfacial agent Interval time Interval time Microstructure Microstructure Ultra-high toughness cementitious composite Ultra-high toughness cementitious composite under 3D-printed technology under 3D-printed technology
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| GB/T 7714 | Luo, Surong , Lin, Qian , Xu, Wei et al. Effects of interval time and interfacial agents on the mechanical characteristics of ultra-high toughnessnn cementitious composites under 3D-printed technology [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 374 . |
| MLA | Luo, Surong et al. "Effects of interval time and interfacial agents on the mechanical characteristics of ultra-high toughnessnn cementitious composites under 3D-printed technology" . | CONSTRUCTION AND BUILDING MATERIALS 374 (2023) . |
| APA | Luo, Surong , Lin, Qian , Xu, Wei , Wang, Dehui . Effects of interval time and interfacial agents on the mechanical characteristics of ultra-high toughnessnn cementitious composites under 3D-printed technology . | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 374 . |
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