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学者姓名：罗素蓉
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Abstract ：
The layer-by-layer stacking process of 3D Printing Construction Technology (3DPCT) inevitably leads to weak bonding areas between the interlayer interfaces and the interstrip interfaces, which affect the mechanical properties of the printed structure. The effects of different carbonation time of recycled sand on the mechanical properties and interfacial bonding performance of 3D printed cement-based material with a 100 % replacement rate of carbonated recycled sand (3DPCRS) were explored. Although, the carbonation time of recycled sand affected the mechanical anisotropy of the printed specimens, the carbonation treatment of recycled sand cannot eliminate the mechanical anisotropy of 3D printed specimens. With the extension of the carbonation time of recycled sand, the interfacial bonding performance was gradually improved. At 28 days, the interlayer shear strength and interstrip shear strength of T7 group increased by 21.5 % and 18.7 %, respectively. After the carbonation of recycled sand, the indentation modulus of the interlayer interface was increased with the decrease of interface width and porosity, which improved the pore structure and the mechanical properties of the printed specimens.
Keyword ：
3D Printing Construction Technology 3D Printing Construction Technology Carbonation time Carbonation time Interfacial bonding performance Interfacial bonding performance Microstructural properties Microstructural properties Recycled sand Recycled sand
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| GB/T 7714 | Luo, Surong , Li, Wenqiang , Cai, Yili et al. Effects of carbonated recycled sand on the interfacial bonding performance of 3D printed cement-based material [J]. | JOURNAL OF BUILDING ENGINEERING , 2025 , 99 . |
| MLA | Luo, Surong et al. "Effects of carbonated recycled sand on the interfacial bonding performance of 3D printed cement-based material" . | JOURNAL OF BUILDING ENGINEERING 99 (2025) . |
| APA | Luo, Surong , Li, Wenqiang , Cai, Yili , Zhang, Kaijian . Effects of carbonated recycled sand on the interfacial bonding performance of 3D printed cement-based material . | JOURNAL OF BUILDING ENGINEERING , 2025 , 99 . |
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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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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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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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In order to improve the mechanical properties of cementitious materials reinforced with polyvinyl alcohol （PVA）fibers，graphene oxide（GO）was introduced into cementitious materials reinforced with PVA fibers，and the effects of GO dosage in the range of 0%-0.05% on the uniaxial tensile properties of the materials were investigated. The results show that the appropriate GO dosage can effectively improve the uniaxial tensile properties of the materials，and the initial crack tensile strength，ultimate tensile strength and ultimate tensile strain of the cementitious materials reaches the maximum value，increased by 26.97%，31.28% and 23.25%，respectively compared with the control group without GO at the age of 28 d，when GO dosage is 0.01%. An appropriate GO dosage can optimize the pore structure，reduce internal defects in the material，facilitate the formation of hydration products，enhance the density of the material’s microstructure，and improve the interfacial bonding force between the fibers and the matrix，thus enhancing the macroscopic properties of the materials reinforced with PVA fibers. © 2024 Tongji University. All rights reserved.
Keyword ：
Fiber bonding Fiber bonding Fibers Fibers Graphene Graphene Hydration Hydration Polyvinyl alcohols Polyvinyl alcohols Pore structure Pore structure Reinforced plastics Reinforced plastics Tensile strain Tensile strain Tensile strength Tensile strength
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| GB/T 7714 | Luo, Surong , Yao, Jiamin , Zhou, Enquan et al. Tensile Properties of Fibers Reinforced Cementitious Materials Modified by Graphene Oxide [J]. | Journal of Building Materials , 2024 , 27 (5) : 400-407 . |
| MLA | Luo, Surong et al. "Tensile Properties of Fibers Reinforced Cementitious Materials Modified by Graphene Oxide" . | Journal of Building Materials 27 . 5 (2024) : 400-407 . |
| APA | Luo, Surong , Yao, Jiamin , Zhou, Enquan , Wang, Shijie . Tensile Properties of Fibers Reinforced Cementitious Materials Modified by Graphene Oxide . | Journal of Building Materials , 2024 , 27 (5) , 400-407 . |
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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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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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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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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.
Keyword ：
3DPC 3DPC Anisotropy Anisotropy Distribution of compressive strength Distribution of compressive strength Microstructures Microstructures Variability Variability
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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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The application of seawater and sea sand concrete (SWSSC) can reduce the construction period and cost of island infrastructure, but it may also bring the risk of alkali-silica reaction (ASR) due to the presence of alkali ions in seawater and sea sand. To compare the characteristics of ASR between SWSSC and seawater and desalinated sea sand (DSS) concrete and investigate the effects of desalinated sea sand on the ASR of SWSSC, the properties and the ASR products of mortar-bars with different desalinated sea sand content were investigated. When the DSS proportion increased from 0% to 100%, the Na+, K+, and Ca+ concentration contents and pH of the specimens decreased by 22.6, 2.0, 45.1 mg center dot L+ and 0.05, and the expansion of mortar bars reduced by 0.16%. Desalination of sea sand could not eliminate the risk of ASR of SWSSC completely. The 14 days expansion of mortar bars with 100% DSS was 0.13%, and the precursors of ASR-P1 were observed by SEM. The experimental results of XRD, FTIR, Raman spectrometer, DTA, SEM, and EDX all showed that with the increase of DSS proportion, the content of Na-shlykovite and ASR-P1 were gradually reduced. A small amount of Mg element in both Na-shlykovite and ASR-P1 was detected by EDX, but the mechanism of Mg element in ASR of SWSSC needs further study. This study can provide a basis for the application of SWSSC in island infrastructure.
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| GB/T 7714 | Wang, Dehui , Gong, Qingnan , Luo, Surong et al. Effects of desalinated sea sand on the alkali-silica reaction of seawater and sea sand concrete [J]. | MAGAZINE OF CONCRETE RESEARCH , 2023 , 76 (7) : 366-374 . |
| MLA | Wang, Dehui et al. "Effects of desalinated sea sand on the alkali-silica reaction of seawater and sea sand concrete" . | MAGAZINE OF CONCRETE RESEARCH 76 . 7 (2023) : 366-374 . |
| APA | Wang, Dehui , Gong, Qingnan , Luo, Surong , Yang, Zhengxian . Effects of desalinated sea sand on the alkali-silica reaction of seawater and sea sand concrete . | MAGAZINE OF CONCRETE RESEARCH , 2023 , 76 (7) , 366-374 . |
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