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学者姓名：张冬
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Seawater sea sand concrete (SWSSC) is considered a potential solution to the shortage of river sand and freshwater resources in the coastal and island regions. Under the marine environment, the sulfate ions in the seawater and sea sand are detrimental to the properties of concrete. Due to the lack of systematic research on the sulfate attack characteristics of SWSSC exposed to different marine conditions, this study compare the sulfate resistance between SWSSC and freshwater desalinated sea sand concrete (FDC) under full immersion, semi -immersion, and dry -wet cycle exposure through the compressive strength, sulfate ion distribution, and microstructural changes after erosion. The findings showed that among the three different exposure conditions, the damage in SWSSC-F (fully immersion) was more severe than that in SWSSC-S (semi -immersion) and SWSSC-DW (dry -wet cycle). The SO42- concentration in inner SWSSC-F was 9.3% and 21.3% higher than that in SWSSC-DW and SWSSC-S, respectively. The microstructural analysis indicated that the higher amount of sulfate attack products and the leaching of Ca2+/OH- in SWSSC-F significantly damaged its microstructure. Besides, carbonation and physical crystallization in SWSSC-S and SWSSC-DW also refined their pore structure, thus enhancing their sulfate resistance. SWSSC showed better sulfate resistance than FDC under different marine exposure conditions in terms of lower erosion product content and better pore structure distribution after 12 months of erosion. The formation of Friedel's salt in SWSSC suppressed the formation of expansion products and reduced the erosion damage of concrete by SO42-.
Keyword ：
Dry -wet cycle Dry -wet cycle Freshwater and desalinated sea sand concrete Freshwater and desalinated sea sand concrete Full immersion Full immersion Seawater sea sand concrete Seawater sea sand concrete Semi -immersion Semi -immersion Sulfate attack Sulfate attack
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| GB/T 7714 | Zhang, Dong , Jiang, Jianwei , Zhang, Zhiwen et al. Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 416 . |
| MLA | Zhang, Dong et al. "Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments" . | CONSTRUCTION AND BUILDING MATERIALS 416 (2024) . |
| APA | Zhang, Dong , Jiang, Jianwei , Zhang, Zhiwen , Fang, Lei , Weng, Yiwei , Chen, Longhui et al. Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 416 . |
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Engineered cementitious composites (ECC) with superior tensile properties have potential to print self-reinforced structures. However, the environmental performance of 3D concrete printing with ECC (3DP-ECC) lacks further investigation. This study evaluates the environmental impacts of structures printed with 3DP-ECC via life cycle assessment. Results show that 3DP-ECC incorporating incineration bottom ash (IBA), crumb rubber (CR), and limestone powder (LP) reduce carbon emission by 25%, 24%, and 47%, respectively, compared to that of reinforced concrete (RC) with a steel ratio of 1.01%. A frame structure printed by LP-ECC reduces carbon emission by 42% compared to that of the unit fabricated by mold-cast RC (MC-RC). A circle house printed by LP-ECC reduces carbon emission by 28% compared to that of the counterpart fabricated by MC-RC. Sensitivity analysis identifies the transportation distance range to achieve a sustainable 3DCP. The findings provide a guideline to select appropriate 3DP-ECC and construction methods for sustainable construction. © 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
Keyword ：
3D printing 3D printing Ash handling Ash handling Environmental management Environmental management Life cycle Life cycle Lime Lime Reinforced concrete Reinforced concrete Sensitivity analysis Sensitivity analysis Sustainable development Sustainable development Waste incineration Waste incineration
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| GB/T 7714 | Ye, Junhong , Zhuang, Zicheng , Teng, Fei et al. Comparative environmental assessment of 3D concrete printing with engineered cementitious composites [J]. | Virtual and Physical Prototyping , 2024 , 19 (1) . |
| MLA | Ye, Junhong et al. "Comparative environmental assessment of 3D concrete printing with engineered cementitious composites" . | Virtual and Physical Prototyping 19 . 1 (2024) . |
| APA | Ye, Junhong , Zhuang, Zicheng , Teng, Fei , Yu, Jie , Zhang, Dong , Weng, Yiwei . Comparative environmental assessment of 3D concrete printing with engineered cementitious composites . | Virtual and Physical Prototyping , 2024 , 19 (1) . |
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采用预湿饱和面干和外加水饱和面干处理再生细骨料(RFA),并以RFA替代50%的河砂，制备超高性能混凝土(UHPC).研究不同处理方式获得的饱和面干RFA对UHPC抗压强度、内部相对湿度和自收缩性能的影响，并利用压汞分析进行机理解释.研究结果表明，当总水胶比为0.24时，与采用预湿饱和面干RFA的UHPC相比，采用外加水饱和面干RFA的UHPC中孔径大于50 nm的孔体积增多，抗压强度降低；内部相对湿度减少，自收缩增大；其28.0 d抗压强度仅降低3.2%,且7.0 d的自收缩仅提高10.5%.因此，在实际工程的UHPC中可采用外加水饱和面干RFA,以获得更好的施工效益.
Keyword ：
内部相对湿度 内部相对湿度 再生细骨料 再生细骨料 自收缩 自收缩 超高性能混凝土 超高性能混凝土 饱和面干 饱和面干
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| GB/T 7714 | 林添琦 , 孙强顺 , 张鸿儒 et al. 饱和面干处理方式对再生细骨料UHPC自收缩性能的影响 [J]. | 福州大学学报(自然科学版) , 2024 , 52 (03) : 316-321 . |
| MLA | 林添琦 et al. "饱和面干处理方式对再生细骨料UHPC自收缩性能的影响" . | 福州大学学报(自然科学版) 52 . 03 (2024) : 316-321 . |
| APA | 林添琦 , 孙强顺 , 张鸿儒 , 刘超 , 张冬 , 季韬 . 饱和面干处理方式对再生细骨料UHPC自收缩性能的影响 . | 福州大学学报(自然科学版) , 2024 , 52 (03) , 316-321 . |
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Accelerated carbonation effectively mitigates the unsoundness issue of steel slag caused by free CaO/MgO. However, the long-term impact of residual uncarbonated iron-rich phases, which may oxidize and lead to expansion and degradation during long-term curing, remains unclear. This study investigated the long-term behavior of carbonated steel slag blocks with varying residual iron content in the steel slag obtained by magnetic separation. The carbon sequestration efficiency, mechanical properties, volume stability, and microstructure were thoroughly evaluated. Results revealed that carbonated steel slag blocks with a higher residual Fe2O3 content (38.47 %) achieved only 46 % of the compressive strength and 37 % of the CO2 uptake compared to those with lower residual iron content (25.88 %). Through 180 days of accelerated degradation and natural curing tests, it was observed that the compressive strength of blocks exhibited an overall increase of 20–150 %, especially in blocks with high iron content, due to the hydration of uncarbonated steel slag. Despite the formation of rust in samples with elevated residual iron content, as verified through XRD and optical microscopy, no substantial negative impacts were observed at later stages. The excessive residual iron containing phase contributed to the formation porous microstructure and enhance the capacity of accommodating corrosion products. This study highlights that reducing residual iron content through magnetic separation not only enhances the mechanical properties and stability of carbonated steel slag blocks, but also offers a valuable recycling opportunity for steel and iron industries. © 2024 The Authors
Keyword ：
Carbonation Carbonation Carbon dioxide Carbon dioxide Compressive strength Compressive strength Curing Curing Hematite Hematite Magnetic separation Magnetic separation Microstructure Microstructure Slags Slags Steel corrosion Steel corrosion
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| GB/T 7714 | Deng, Jiaxin , Zhang, Dong , Gu, Lei et al. Influence of residual iron content in steel slag on the long-term properties of carbonated steel slag blocks [J]. | Case Studies in Construction Materials , 2024 , 20 . |
| MLA | Deng, Jiaxin et al. "Influence of residual iron content in steel slag on the long-term properties of carbonated steel slag blocks" . | Case Studies in Construction Materials 20 (2024) . |
| APA | Deng, Jiaxin , Zhang, Dong , Gu, Lei , Zhang, Xiaoxiang , Yuan, Huihui . Influence of residual iron content in steel slag on the long-term properties of carbonated steel slag blocks . | Case Studies in Construction Materials , 2024 , 20 . |
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为评价公路工程改扩建项目既有设施拆除固废的碳排放量,提出了一种拆除固废回收再利用的碳减排量效益评价方法。运用生命周期评价理论,通过建立拆除的既有设施破碎、加工、运输、建造利用全过程的碳排放活动清单,确定碳排放范围与因子,然后进行碳排放量计算,最后根据计算结果,进行既有设施拆除固废利用优选方案的决策与评价。依托京港澳高速公路东莞段改扩建工程,进行的既有设施拆除利用的碳减排效益计算结果表明,与利用天然材料相比,既有设施拆除固废加工产生的骨料再生利用单位碳减排效益为4.26～22.53 kg/m~3,碳减排效益从高到低的利用方案分别为特殊路基处理>级配碎石底基层>水稳碎石基层>水泥混凝土路面面层>桥面现浇整体化层>排水防护工程>新泽西护栏。结合施工组织计划决策的推荐方案可利用建筑固废39.4万m~3,节省砂石骨料20.02万m~3,预期可减碳207.05万kg,再生骨料平均减碳效益约10.34 kg/m~3。
Keyword ：
公路工程 公路工程 拆除利用 拆除利用 改扩建 改扩建 既有设施 既有设施 碳减排 碳减排
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| GB/T 7714 | 杨明 , 罗晶 , 张冬 et al. 既有设施拆除固废再利用的碳减排效益评价 [J]. | 公路 , 2024 , (07) : 291-297 . |
| MLA | 杨明 et al. "既有设施拆除固废再利用的碳减排效益评价" . | 公路 07 (2024) : 291-297 . |
| APA | 杨明 , 罗晶 , 张冬 , 张静波 , 李卓智 . 既有设施拆除固废再利用的碳减排效益评价 . | 公路 , 2024 , (07) , 291-297 . |
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This paper presents an experimental study on tensile behavior of steel and ultra-high performance concrete (UHPC) composite structure connected by different connections including epoxy resin adhesive, headed stud, and hybrid of the former two. Thirty-two pull-out tests are conducted by taking the connection type, specimen size and steel fiber content of UHPC as the main parameters. The influences of these main parameters on the failure mode, load-separation behavior, and ultimate resistance of connection are researched. The failure modes of specimens with hybrid connection are UHPC interface debonding and UHPC cone failure, which is identical with the epoxy resin adhesive connection and headed stud connection, respectively. The tensile resistance ratio of headed stud connection to epoxy resin adhesive connection has a significant influence both on the separation performance and tensile resistance of hybrid connection. An empirical equation for predicting the tensile resistance of hybrid connection was proposed by taking the tensile resistance ratio of headed stud to epoxy resin adhesive. The ratio of predicted to test result was 0.973with standard deviations of 0.070. The pull-out tests and analysis of the hybrid connection in steel-UHPC composite structure were still needed to study to get it improved. © 2024 Institution of Structural Engineers
Keyword ：
Adhesives Adhesives Composite structures Composite structures Epoxy resins Epoxy resins Failure modes Failure modes High performance concrete High performance concrete Steel fibers Steel fibers Steel testing Steel testing Structure (composition) Structure (composition) Studs (fasteners) Studs (fasteners) Studs (structural members) Studs (structural members)
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| GB/T 7714 | Li, Cong , Ji, Dai lai , Zhang, Dong et al. Pull-out test of hybrid connection in steel-UHPC composite slab [J]. | Structures , 2024 , 66 . |
| MLA | Li, Cong et al. "Pull-out test of hybrid connection in steel-UHPC composite slab" . | Structures 66 (2024) . |
| APA | Li, Cong , Ji, Dai lai , Zhang, Dong , Chen, Baochun . Pull-out test of hybrid connection in steel-UHPC composite slab . | Structures , 2024 , 66 . |
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Ferroaluminate cement (FAC) is a relatively new type of low-carbon cement. The corrosion performance of steel reinforcement embedded in FAC concrete is critical for its application in the structure. In this study, the corrosion behaviors of steel reinforcement in FAC concrete were investigated by conducting steel corrosion tests and chloride penetration tests considering the effect of different water -to -binder (w/b) ratios. In addition, the effect of substitution rate of fly ash (FA) and granulated ground blast furnace slag (GGBS) for FAC on the corrosion behavior of steel reinforcement was also investigated. The results show that compared to ordinary Portland cement concrete, FAC concrete showed much better corrosion resistance at a w/b ratio of 0.4 but the corrosion resistance reduced significantly at a high w/b ratio of 0.56. At a low w/b ratio, the abundant hydration products in FAC reduced its porosity, resulting in a low chloride diffusivity and good corrosion resistance. Incorporating FA/GGBS generally reduced the corrosion resistance of FAC concrete. The dilution of FAC cement by FA/GGBS reduced the hydration products and increased the porosity, thus increasing the chloride diffusivity. FAC concrete with GGBS showed better corrosion resistance than that of FAC concrete with FA at the same content.
Keyword ：
Chloride permeation resistance Chloride permeation resistance Corrosion resistance Corrosion resistance Ferroaluminate cement (FAC) Ferroaluminate cement (FAC) Fly ash Fly ash GGBS GGBS
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| GB/T 7714 | Zhang, Pu , Qi, Dongyou , Hao, Lulu et al. Effect of w/b ratio and supplemental cementitious material on the chloride penetration and corrosion resistance of ferroaluminate cement concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 431 . |
| MLA | Zhang, Pu et al. "Effect of w/b ratio and supplemental cementitious material on the chloride penetration and corrosion resistance of ferroaluminate cement concrete" . | CONSTRUCTION AND BUILDING MATERIALS 431 (2024) . |
| APA | Zhang, Pu , Qi, Dongyou , Hao, Lulu , Wang, Zhiyong , Liu, Hongyin , Zhang, Dong et al. Effect of w/b ratio and supplemental cementitious material on the chloride penetration and corrosion resistance of ferroaluminate cement concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 431 . |
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In this study, the size effect of the thickness of the specimen on the mechanical properties of UHPC was investigated through compression tests under cyclic loading. UHPC prisms with different thicknesses from 20 mm to 100 mm were tested under unloading/reloading cycles and the stress-strain curves were recorded for this purpose. A constitutive model to predict the stress-strain response of UHPC accounting for the thickness was proposed. It was found that UHPC specimens with different thicknesses showed the same failure mode of di-agonal shear failure. The size effect of thickness was significant for the compressive strength but was negligible for the peak strain and elastic modulus. The damage of the unloading modulus and reloading modulus at zero stress only occurred when the unloading strain exceeded 0.8 times the peak strain. Furthermore, the proposed constitutive model could predict the stress-strain response for UHPC with different thicknesses under cyclic compressive loading with acceptable accuracy.
Keyword ：
Constitutive model Constitutive model Cyclic compressive loading Cyclic compressive loading Size effect Size effect Ultra-high performance concrete Ultra-high performance concrete
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| GB/T 7714 | Zhang, Xiaochen , Lu, Ya , Wu, Xiangguo et al. Constitutive model for ultra-high performance concrete (UHPC) considering the size effect under cyclic compressive loading [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 368 . |
| MLA | Zhang, Xiaochen et al. "Constitutive model for ultra-high performance concrete (UHPC) considering the size effect under cyclic compressive loading" . | CONSTRUCTION AND BUILDING MATERIALS 368 (2023) . |
| APA | Zhang, Xiaochen , Lu, Ya , Wu, Xiangguo , Wang, Puyan , Li, Ran , Liu, Yang et al. Constitutive model for ultra-high performance concrete (UHPC) considering the size effect under cyclic compressive loading . | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 368 . |
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This study aims to understand the shear performance of reinforced ultra-high performance concrete (R-UHPC) short beams and to propose a calculation method for their shear capacity. A total of 11 R-UHPC short beam specimens were tested to investigate the effects of key parameters on the shear capacity, including steel fiber volume fraction, longitudinal reinforcement ratio, stirrup ratio, and shear span-to-depth ratio. Experimental results indicated that the shear capacity increased with the increase of steel fiber volume fraction, longitudinal reinforcement ratio, and stirrup ratio, while it decreased with the increase of shear span-to-depth ratio. Results also showed that for R-UHPC beams, the effect of shear span-to-depth ratio can only be ignored for a ratio less than 1.2 rather than 1.5 that is required for reinforced concrete (RC) beams by the Chinese design code. Moreover, it was found that the calculation methods for the shear capacity of R-UHPC beams in the current codes underestimated the shear capacity of the specimens by 30 % similar to 50 %, as these methods did not consider the aforementioned significant parameters. A calculation method was proposed based on the modified compression field theory (MCFT) to comprehensively consider all the aforementioned parameters. The proposed method exhibited a higher accuracy and less dispersion as compared to the methods specified by current codes.
Keyword ：
Design method Design method Failure mode Failure mode Modified compression field theory (MCFT) Modified compression field theory (MCFT) Shear capacity Shear capacity Short beams Short beams Ultra-high performance concrete (UHPC) Ultra-high performance concrete (UHPC)
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| GB/T 7714 | Chen, Baochun , Zhou, Jialiang , Zhang, Dong et al. Shear performances of reinforced ultra-high performance concrete short beams [J]. | ENGINEERING STRUCTURES , 2023 , 277 . |
| MLA | Chen, Baochun et al. "Shear performances of reinforced ultra-high performance concrete short beams" . | ENGINEERING STRUCTURES 277 (2023) . |
| APA | Chen, Baochun , Zhou, Jialiang , Zhang, Dong , Sennah, Khaled , Nuti, Camillo . Shear performances of reinforced ultra-high performance concrete short beams . | ENGINEERING STRUCTURES , 2023 , 277 . |
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Determining the damage level of the fire-damaged concrete structure is critical for the structural assessment and repair of buildings after fire. Existing methods assess the damage levels of concrete by measuring the remaining mechanical performance in a traditional manner, where they either have limited accuracy or efficiency due to the need of heavy machines and experienced laborers. In contrast with these methods, we propose a deep learning based approach called Tempnet to promote the efficiency and effectiveness of damage level assessment for concrete after fire. Tempnet incorporates a graph convolutional layer and a conventional convolutional layer to encode the temperature interdependency between neighboring areas in the images of fire-affected concrete to capture the exposed temperature fields of the concrete. Three closely related application scenarios together with their corresponding datasets have been proposed to evaluate the performance of Tempnet. Extensive comparative experiments and ablation studies have validated the model design, the high efficiency, and the robust performance of Tempnet, with a performance metric F1 value higher than 0.97 in all applications. Case studies were conducted further to provide insightful illustration of Tempnet's impressive performance. It is envisioned that the Tempnet can contribute to the efficient maintenance of concrete structures following fire accidents for construction applications.
Keyword ：
Concrete Concrete Graph convolutional network Graph convolutional network High temperature High temperature Temperature field Temperature field
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| GB/T 7714 | Chen, Huaguo , Yang, Jianjun , Chen, Xinhong et al. Tempnet: A graph convolutional network for temperature field prediction of fire-damaged concrete [J]. | EXPERT SYSTEMS WITH APPLICATIONS , 2023 , 238 . |
| MLA | Chen, Huaguo et al. "Tempnet: A graph convolutional network for temperature field prediction of fire-damaged concrete" . | EXPERT SYSTEMS WITH APPLICATIONS 238 (2023) . |
| APA | Chen, Huaguo , Yang, Jianjun , Chen, Xinhong , Zhang, Dong , Gan, Vincent J. L. . Tempnet: A graph convolutional network for temperature field prediction of fire-damaged concrete . | EXPERT SYSTEMS WITH APPLICATIONS , 2023 , 238 . |
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