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学者姓名：王德辉
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Abstract ：
To address the problem of scarce freshwater in marine engineering construction, seawater is used as a substitute for freshwater in concrete, offering both environmental and economic advantages. Simulated seawater of varying concentrations was designed to assess its effect on seawater concrete's drying shrinkage, with corresponding concrete samples prepared. Drying shrinkage and mass loss measurements were taken for seawater concrete (SWC) at various ages. According to the results of Thermogravimetric Analysis (TGA), X-ray Diffraction (XRD), Mercury Intrusion Porosimetry (MIP) and Scanning Electronic Microscopy (SEM), the effects of different seawater concentration on the phase and content of hydration products, pore structure and micromorphology of SWC were analyzed. The results reveal consistently higher drying shrinkage and mass loss in SWC than in ordinary concrete (OC). An increase in seawater concentration is found to enhance the formation of hydration products, leading to a refinement in the pore structure of the concrete. The shrinkage is positively correlated with the abundance of pores smaller than 100 nm and is also dynamically influenced by the variety and proportion of hydration products. A modified model derived from the GL2000 and factoring in seawater concentration, has been introduced to forecast the drying shrinkage in SWC. The insights garnered from this research provide a foundational theoretical groundwork for the construction of marine infrastructure in diverse geographical settings.
Keyword ：
Drying shrinkage Drying shrinkage Hydration products Hydration products Mass loss Mass loss Pore structure Pore structure Seawater concentration Seawater concentration Seawater concrete Seawater concrete
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| GB/T 7714 | Wang, Xiaomin , Wu, Haodong , Chen, Rong et al. Effects of seawater concentration on the drying shrinkage of seawater concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 457 . |
| MLA | Wang, Xiaomin et al. "Effects of seawater concentration on the drying shrinkage of seawater concrete" . | CONSTRUCTION AND BUILDING MATERIALS 457 (2024) . |
| APA | Wang, Xiaomin , Wu, Haodong , Chen, Rong , Wang, Ming , Chen, Ran , Weng, Lincheng et al. Effects of seawater concentration on the drying shrinkage of seawater concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 457 . |
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To investigate the impact of limestone powder on the chloride ion concentration coefficient of cement pastes, various techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and mercury-porosimetry (MIP) were employed in this paper. The findings demonstrate that the creation of Friedel's salt is inversely associated with the addition of limestone powder, that is, Friedel's salt production is lessened by adding more limestone powder, however, the coefficient of chloride ion concentration initially decreased and then increased again, as does the porosity, and most likely the pore size as well. The specific surface area of limestone powder has increased, and the content of Friedel's salt increased first and then decreased. However, the shifting trend of Friedel's salt and chloride ion concentration coefficient is in direct opposition, and the pore structure was therefore significantly enhanced. The results of this study offer robust theoretical backing for the inclusion of limestone powder in concrete and provide a positive assessment of its potential applications.
Keyword ：
chloride ion concentration coefficient chloride ion concentration coefficient content content friedel's salt friedel's salt limestone powder limestone powder specific surface area specific surface area
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| GB/T 7714 | Zhang, Kaijian , Huang, Zeping , Jia, Xuxiu et al. Experimental Study on the Chloride Ion Concentration of Cement Pastes Prepared with Limestone Powder [J]. | JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION , 2024 , 39 (6) : 1474-1483 . |
| MLA | Zhang, Kaijian et al. "Experimental Study on the Chloride Ion Concentration of Cement Pastes Prepared with Limestone Powder" . | JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION 39 . 6 (2024) : 1474-1483 . |
| APA | Zhang, Kaijian , Huang, Zeping , Jia, Xuxiu , Wang, Dehui . Experimental Study on the Chloride Ion Concentration of Cement Pastes Prepared with Limestone Powder . | JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION , 2024 , 39 (6) , 1474-1483 . |
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为明确不同浓度磷酸溶液激发偏高岭土的最佳液固比(L/S)值,本文设置了 4、5、6、7、8 mol·L-1五组磷酸溶液以及0.6、0.7、0.8、0.9四种L/S值来制备偏高岭土-磷酸基地聚物(MPAG).以MPAG的7和28 d抗压、抗折强度作为评价指标,探究上述预设变量对MPAG力学性能的影响,进一步研究每组浓度最佳L/S值试样经硫酸盐侵蚀后的抗压强度,并对MPAG物相组成和微观形貌进行表征及分析.结果表明:MPAG主要由无定形磷酸铝相组成;当磷酸溶液浓度为4～6 mol·L-1时,L/S值为0.6时,制得的试样抗压强度更大,溶液浓度增大至7或8 mol·L-1时,推荐L/S值为0.7;MPAG抗硫酸盐侵蚀能力佳,浸泡28 d后抗压强度保留率达84％～93％;任一L/S值下,使用6 mol·L-1磷酸溶液制备的试样均取得该L/S值的最大抗折强度;当L/S值为0.6时,28 d最大抗折强度为6.80 MPa.本文研究结果可为MPAG的制备及应用提供参考.
Keyword ：
偏高岭土 偏高岭土 力学性能 力学性能 地聚物 地聚物 微观表征 微观表征 硫酸盐侵蚀 硫酸盐侵蚀 磷酸激发 磷酸激发
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| GB/T 7714 | 段立伟 , 罗安邦 , 陈英豪 et al. 偏高岭土-磷酸基地聚物的力学性能及微观结构分析 [J]. | 硅酸盐通报 , 2024 , 43 (10) : 3694-3703 . |
| MLA | 段立伟 et al. "偏高岭土-磷酸基地聚物的力学性能及微观结构分析" . | 硅酸盐通报 43 . 10 (2024) : 3694-3703 . |
| APA | 段立伟 , 罗安邦 , 陈英豪 , 王德辉 , 罗正东 . 偏高岭土-磷酸基地聚物的力学性能及微观结构分析 . | 硅酸盐通报 , 2024 , 43 (10) , 3694-3703 . |
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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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Abstract ：
The shortages of river sand and freshwater in marine engineering can be addressed by utilizing seawater and sea sand concrete (SWSSC). However, the sulfate resistance of SWSSC at low temperature is not clear. In this study, the seawater and sea sand cement mortar (SSCM) and ordinary cement mortar (OCM) with different limestone powder (LP) content were corroded by different sulfate solutions at 5 °C. The change of compressive strength and compositions of corrosion products in mortars after different times of corrosion were studied. The results show that SSCM presents 9.4∼19 % lower strength loss and better sulfate resistance than OCM. The presence of Friedel's salt in SSCM contributes to a reduction in corrosion products like ettringite, gypsum, and thaumasite, thereby minimizing microstructural damage and mitigating the thaumasite sulfate attack (TSA). All mortars containing LP suffer from TSA and significantly damage with 17.4∼48.7 % strength loss after 360 days of MgSO4 or Na2SO4 corrosion. Increasing the LP content exacerbates the TSA damage in SSCM. This is primarily due to the additional soluble carbonate from LP promoting the formation of gypsum and thaumasite, thereby worsening the microstructure deterioration of SSCM. Meanwhile, the thaumasite is not found in SSCM without LP after corrosion. In contrast to Na2SO4 corrosion, the thaumasite formation under MgSO4 corrosion mainly results from indirect reaction. The combined corrosion effects of Mg2+ and SO42- lead to a more significant increase in expansive products (thaumasite and gypsum) and TSA damage. The findings of this study help to advance the sulfate resistance of SWSSC in marine environments. © 2024 Elsevier Ltd
Keyword ：
Cements Cements Compressive strength Compressive strength Concretes Concretes Corrosive effects Corrosive effects Deterioration Deterioration Lime Lime Limestone Limestone Magnesium compounds Magnesium compounds Sand Sand Seawater corrosion Seawater corrosion Silicate minerals Silicate minerals Sodium sulfate Sodium sulfate Temperature Temperature
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| GB/T 7714 | Wang, Dehui , Zhang, Zhiwen , Chen, Rong et al. Thaumasite sulfate attack characteristic of seawater and sea sand concrete with limestone powder in different sulfate environment at low temperature [J]. | Construction and Building Materials , 2024 , 437 . |
| MLA | Wang, Dehui et al. "Thaumasite sulfate attack characteristic of seawater and sea sand concrete with limestone powder in different sulfate environment at low temperature" . | Construction and Building Materials 437 (2024) . |
| APA | Wang, Dehui , Zhang, Zhiwen , Chen, Rong , Wang, Ming , Chen, Ran , Weng, Lincheng et al. Thaumasite sulfate attack characteristic of seawater and sea sand concrete with limestone powder in different sulfate environment at low temperature . | Construction and Building Materials , 2024 , 437 . |
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The application of seawater and sea sand concrete (SWSSC) is beneficial for marine engineering, but the impact of aggregate gradation on its alkali-silica reaction (ASR) remains poorly understood. This study aims to bridge this gap by analyzing ASR products, pore characteristics and expansion rate of specimens. The test results reveal that ordinary concrete (OC) exhibits an inhibitory effect on ASR in comparison with to SWSSC. The 14-day expansion of ordinary concrete and SWSSC with the same aggregate gradation are 0.130 % and 0.212 %, showing potential and high risk of ASR, respectively. Moreover, particle size and gradation of aggregate are the key factors influencing the ASR degree of SWSSC. Compared with coarser aggregate, specimens with finer aggregate consume more K+ and Ca2+ ions, generate more ASR-P1, form less porosity, and produce a larger expansion. Additionally, specimens with gap-graded aggregates, as opposed to those with uniform or continuous gradation, show greater consumption of K+ and Ca2+ ions, increased ASR-P1 formation, more harmful pore formation, and a larger expansion. These results offer insights into optimizing aggregate gradation to reduce ASR in SWSSC and improve its durability. © 2024
Keyword ：
Concrete aggregates Concrete aggregates Expansion Expansion Particle size Particle size Seawater corrosion Seawater corrosion Silica Silica
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| GB/T 7714 | Wu, Wenda , Kang, Sixiang , Gong, Qingnan et al. Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete [J]. | Construction and Building Materials , 2024 , 427 . |
| MLA | Wu, Wenda et al. "Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete" . | Construction and Building Materials 427 (2024) . |
| APA | Wu, Wenda , Kang, Sixiang , Gong, Qingnan , Yao, Hongyu , Zhang, Kaijian , Yang, Hongfei et al. Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete . | Construction and Building Materials , 2024 , 427 . |
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混凝土的碱硅酸反应(Alkali-silica reaction, ASR)本质上是孔溶液中的离子、水分子与骨料中活性二氧化硅的反应。根据不同离子对ASR的影响效果，可将离子分为碱离子(Na~+、K~+和OH~-)、锂离子和铝离子、钙离子。碱离子(Na~+、K~+和OH~-)促进混凝土的碱硅酸反应，导致混凝土发生更严重的膨胀性破坏。Al~(3+)和Li~+减缓混凝土碱硅酸反应造成的膨胀性破坏；Ca~(2+)起到的作用与n(Ca)/n(Si)(物质的量比)密切相关，当n(Ca)/n(Si)<0.2时，Ca~(2+)对ASR起促进作用；当n(Ca)/n(Si)≥0.2时，Ca~(2+)对ASR起抑制作用。本文首先介绍了ASR反应产物的最新研究进展，包括ASR产物的种类、微观形貌、原子结构及水稳定性，综述了这些离子对ASR反应过程、ASR产物组成、ASR产物结晶性能及膨胀性的影响，展望了不同离子对混凝土ASR影响的未来研究方向。
Keyword ：
ASR产物 ASR产物 碱硅酸反应 碱硅酸反应 碱离子 碱离子 钙离子 钙离子 铝离子 铝离子 锂离子 锂离子
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| GB/T 7714 | 龚青南 , 王德辉 . 不同离子对混凝土碱硅酸反应影响的研究进展 [J]. | 材料导报 , 2024 , 38 (02) : 89-103 . |
| MLA | 龚青南 et al. "不同离子对混凝土碱硅酸反应影响的研究进展" . | 材料导报 38 . 02 (2024) : 89-103 . |
| APA | 龚青南 , 王德辉 . 不同离子对混凝土碱硅酸反应影响的研究进展 . | 材料导报 , 2024 , 38 (02) , 89-103 . |
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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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通过10组试验，研究了10%～30%粉煤灰、 10%～30%矿渣、 5%～15%偏高岭土在单掺下对海水海砂混凝土抗氯离子渗透性能及化学组成的影响，并通过扫描电镜对微观结构进行分析.结果表明：海水海砂混凝土氯离子扩散系数随着粉煤灰掺量提高先减少后增大，随着矿渣掺量提高逐渐增大，随着偏高岭土掺量提高逐渐减小；偏高岭土、矿渣和20%以下粉煤灰掺入海水海砂混凝土后，均可见随着掺量的提高混凝土中的Friedel盐增多，自由氯离子及Ca(OH)_2含量降低，混凝土孔溶液pH值降低；偏高岭土对海水海砂混凝土的氯离子化学结合和物理吸附作用及微观结构的改善最佳，20%以内掺量的粉煤灰次之.
Keyword ：
微观结构 微观结构 抗氯离子渗透性能 抗氯离子渗透性能 海水海砂混凝土 海水海砂混凝土 矿物掺和料 矿物掺和料
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| GB/T 7714 | 余海玲 , 郑建岚 , 王国杰 et al. 矿物掺和料对海水海砂混凝土抗氯离子渗透性的影响 [J]. | 福州大学学报(自然科学版) , 2024 , 52 (03) : 284-290 . |
| MLA | 余海玲 et al. "矿物掺和料对海水海砂混凝土抗氯离子渗透性的影响" . | 福州大学学报(自然科学版) 52 . 03 (2024) : 284-290 . |
| APA | 余海玲 , 郑建岚 , 王国杰 , 王德辉 . 矿物掺和料对海水海砂混凝土抗氯离子渗透性的影响 . | 福州大学学报(自然科学版) , 2024 , 52 (03) , 284-290 . |
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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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