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学者姓名：於德美
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Abstract ：
Pre-mixed fluidized solidified soil (PFSS) has the advantages of pumpability, convenient construction, and a short setting time. This paper took the excavated loess in Fuzhou as the research object and used cement-fly-ash-ground granulated blast furnace slag-carbide slag as a composite geopolymer system (CFGC) to synthesize PFSS. This study investigated the fluidity and mechanical strength of PFSS under different water-solid ratios and curing agent dosages; finally, the microstructure of the composite geopolymer system-pre-mixed fluidized solidified soil (CFGC-PFSS) was characterized. The results showed that when the water-solid ratio of PFSS increased from 0.46 to 0.54, the fluidity increased by 77 mm, and the flexural strength and compressive strength at 28 d decreased to 450.8 kPa and 1236.5 kPa. When the curing agent dosage increased from 15% to 25%, the fluidity increased by 18.0 mm, and the flexural strength and compressive strength at 28 d increased by 1.7 times and 1.6 times. A large number of needle-like AFt, C-S-H gel, and C-(A)-S-H gel coagulate with soil particles to form a three-dimensional reticular structure, which is the mechanism of the strength formation of PFSS under the action of CFGC.
Keyword ：
curing agent dosage curing agent dosage microstructure microstructure pre-mixed fluidized solidified soil pre-mixed fluidized solidified soil water-solid ratio water-solid ratio workability and mechanical strength workability and mechanical strength
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| GB/T 7714 | Chen, Shujie , Zhang, Hengchun , Yang, Zhengzhou et al. Mechanical Properties and Microstructure of Geopolymer-Based PFSS Synthesized from Excavated Loess [J]. | MATERIALS , 2025 , 18 (1) . |
| MLA | Chen, Shujie et al. "Mechanical Properties and Microstructure of Geopolymer-Based PFSS Synthesized from Excavated Loess" . | MATERIALS 18 . 1 (2025) . |
| APA | Chen, Shujie , Zhang, Hengchun , Yang, Zhengzhou , Feng, Chao , Wang, Yao , Yu, Demei et al. Mechanical Properties and Microstructure of Geopolymer-Based PFSS Synthesized from Excavated Loess . | MATERIALS , 2025 , 18 (1) . |
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In this study, lightweight ultra-high performance concrete (LUHPC) was prepared by replacing different components in the mixture of ultra-high performance concrete (UHPC) with hollow glass microspheres (HGMs). The specimens with different curing ages were evaluated in order to investigate the influencing effects of HGMs on the performance of UHPC. Additionally, isothermal calorimetry and thermogravimetric experiments were conducted to quantify the pozzolanic activity of HGMs and substituted supplementary cementitious materials. Scanning electron microscopy was used to observe and analyze the morphology of LUHPC. The results showed that HGMs possessed moderate reactivity which was responsible in increasing the degree of hydration and reducing the impact on the mechanical properties, where inert materials in the UHPC mixture was replaced. High-temperature curing promotes the reaction of the HGMs and significantly enhanced the strength of LUHPC, resulting in mechanical performance notably higher than that obtained under standard curing. By optimizing mixture proportion, a LUHPC mixture with a density of 1890 kg/m3 achieved 134 MPa in compressive and 19 MPa in flexural strength.
Keyword ：
Hollow glass microspheres Hollow glass microspheres Lightweight Lightweight Mechanical strength Mechanical strength Mixture proportion optimization Mixture proportion optimization Ultra-high performance concrete Ultra-high performance concrete
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| GB/T 7714 | Chen, Zhiyuan , Zhang, Siheng , Zheng, Wanying et al. Influence of hollow glass microspheres on the performance of lightweight ultra-high performance concrete and mixture proportion optimization [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 472 . |
| MLA | Chen, Zhiyuan et al. "Influence of hollow glass microspheres on the performance of lightweight ultra-high performance concrete and mixture proportion optimization" . | CONSTRUCTION AND BUILDING MATERIALS 472 (2025) . |
| APA | Chen, Zhiyuan , Zhang, Siheng , Zheng, Wanying , Fan, Hongyu , Yu, Demei , Fu, Tengfei et al. Influence of hollow glass microspheres on the performance of lightweight ultra-high performance concrete and mixture proportion optimization . | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 472 . |
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Abstract ：
Fluidized solidified soil (FSS) is an innovative backfill material that offers benefits such as easy pumping and straightforward construction. This study examined how varying the water-soil ratio and the curing agent dosage affect the properties and microstructure of FSS. The strength development mechanism was investigated when composite solidification agents were used. The findings show that both the water-solid ratio and the curing agent dosage can affect the microstructure of FSS, thereby affecting its performance. When the water-solid ratio increases from 0.52 to 0.56, the unconfined compressive strength (UCS) and flexural strength of the FSS decrease by 34.1% and 39.3% after 28 d. Conversely, the curing agent dosage increasing from 10% to 30% will increase both UCS and flexural strength by 11.2 times and 11.1 times. As the curing age increases, the number of cracks at failure point in the FSS will increase and lead to a more complete failure. Numerous needle-like AFt, C-S-H gel, and C-(A)-S-H gel create a three-dimensional network by adhering to soil particles.
Keyword ：
curing agent dosage curing agent dosage fluidized solidified soil fluidized solidified soil maintenance age maintenance age microscopic analysis: mechanism of strength formation microscopic analysis: mechanism of strength formation water-solid ratio water-solid ratio
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| GB/T 7714 | Chen, Shujie , Feng, Chao , Fu, Tengfei et al. Performance and Characterization of Fluidized Solidified Soil Prepared by Synergistic Cement and Phosphogypsum with Slag Powder-Fly Ash [J]. | JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION , 2025 , 40 (5) : 1320-1329 . |
| MLA | Chen, Shujie et al. "Performance and Characterization of Fluidized Solidified Soil Prepared by Synergistic Cement and Phosphogypsum with Slag Powder-Fly Ash" . | JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION 40 . 5 (2025) : 1320-1329 . |
| APA | Chen, Shujie , Feng, Chao , Fu, Tengfei , Yu, Demei , Zheng, Hengchun , Zhang, Feng et al. Performance and Characterization of Fluidized Solidified Soil Prepared by Synergistic Cement and Phosphogypsum with Slag Powder-Fly Ash . | JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION , 2025 , 40 (5) , 1320-1329 . |
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The production of manufactured sand and stone processing can cause dust pollution due to the generation of a significant amount of stone powder. This dust (mainly granite powder) was collected and incorporated as a cement replacement into mass-manufactured sand concrete in order to enhance the mechanical properties and microstructures. The heat of the hydration was measured by adding the granite powder into the cementitious material system. The mechanical properties, autogenous shrinkage, and pore structures of the concrete were tested. The results showed that the mechanical strength of the concrete increased first and then decreased with the increase in granite powder content. By replacing the 5% cement with the granite powder, the 28 d compressive and flexural strength increased by 17.6% and 20.9%, respectively. The autogenous shrinkage was mitigated by the incorporation of the 10% granite powder and decreased by 19.7%. The mechanism of the granite powder in the concrete was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). The porosity decreased significantly within the 10% granite powder. A microstructure analysis did not reveal a change in the type of hydration products but rather that the granite powder played a role in the microcrystalline nucleation during the hydration process.
Keyword ：
heat of hydration heat of hydration manufactured sand concrete manufactured sand concrete mechanical properties mechanical properties microstructure microstructure pore distribution pore distribution
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| GB/T 7714 | Huang, Jian , Xu, Guangfeng , Chen, Shujie et al. Enhancing Mechanical Properties and Microstructures of Mass-Manufactured Sand Concrete by Incorporating Granite Powder [J]. | MATERIALS , 2024 , 17 (10) . |
| MLA | Huang, Jian et al. "Enhancing Mechanical Properties and Microstructures of Mass-Manufactured Sand Concrete by Incorporating Granite Powder" . | MATERIALS 17 . 10 (2024) . |
| APA | Huang, Jian , Xu, Guangfeng , Chen, Shujie , Yu, Demei , Fu, Tengfei , Feng, Chao et al. Enhancing Mechanical Properties and Microstructures of Mass-Manufactured Sand Concrete by Incorporating Granite Powder . | MATERIALS , 2024 , 17 (10) . |
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In this study, the properties of ultra-high-performance concrete (UHPC) were enhanced by adding modified polyvinyl alcohol (PVA) fibers. The specimens with different curing ages were evaluated in various aspects to investigate the effects of different dosages, lengths, and surface treatments of PVA fibers on the performance of UHPC. The performance was compared with that of steel fiber-reinforced UHPC with the same ratio and multiple dosages. At the same time, the distribution of fibers and the morphology of fibers were observed by a scanning electron microscope, and the mechanism of fiber reinforcement was discussed. The results showed that the mechanical properties were significantly affected by the fiber dosage, length, and surface treatment. Based on the test results, the optimum PVA fiber addition can increase the compressive strength and flexural strength by 12.0% and 6.0% compared to the control UHPC without fibers. A comprehensive evaluation was carried out and indicated that the optimum PVA fiber addition has the potential to replace 0.5% steel fiber in certain conditions.
Keyword ：
enhancing mechanism enhancing mechanism polyvinyl alcohol fiber polyvinyl alcohol fiber UHPC UHPC
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| GB/T 7714 | Chen, Zhiyuan , Fan, Hongyu , Zheng, Wanying et al. Influence of Modified PVA Fiber on Ultra-High Performance Concrete and Its Enhancing Mechanism [J]. | POLYMERS , 2024 , 16 (23) . |
| MLA | Chen, Zhiyuan et al. "Influence of Modified PVA Fiber on Ultra-High Performance Concrete and Its Enhancing Mechanism" . | POLYMERS 16 . 23 (2024) . |
| APA | Chen, Zhiyuan , Fan, Hongyu , Zheng, Wanying , Zhang, Siheng , Wu, Xi , Fu, Tengfei et al. Influence of Modified PVA Fiber on Ultra-High Performance Concrete and Its Enhancing Mechanism . | POLYMERS , 2024 , 16 (23) . |
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Abstract ：
近年来工程中大量使用纤维来对土体进行加固处理。纤维的掺入提高了土体力学强度，还能改善其变形特性。本文从纤维加筋固化土的实际需求出发，对纤维种类、掺量和长度等因素在加筋固化土中的作用进行了总结，同时从宏、微观角度对纤维加筋固化土的增强机制进行了分析，并介绍了纤维加筋固化土的变形特性和模型构建的研究现状。此外，还展望了该领域未来研究的发展趋势。
Keyword ：
力学强度 力学强度 变形特性 变形特性 固化土 固化土 增强机制 增强机制 模型构建 模型构建 纤维加筋 纤维加筋
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| GB/T 7714 | 於德美 , 陈书杰 , 张峰 et al. 纤维加筋固化土研究现状及展望 [J]. | 材料导报 , 2024 , 38 (S2) : 139-146 . |
| MLA | 於德美 et al. "纤维加筋固化土研究现状及展望" . | 材料导报 38 . S2 (2024) : 139-146 . |
| APA | 於德美 , 陈书杰 , 张峰 , 冯超 , 张恒春 , 王耀 et al. 纤维加筋固化土研究现状及展望 . | 材料导报 , 2024 , 38 (S2) , 139-146 . |
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流态固化土因具有良好的流动性可应用于狭小空间的回填，外掺玻璃纤维可有效改善其力学性能和水稳性。为了解纤维加筋流态固化土的固化效果，在流态固化土中分别外掺0.1%～0.5%g/cm
Keyword ：
力学强度 力学强度 微观结构 微观结构 水稳性 水稳性 流动度 流动度 流态固化土 流态固化土
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| GB/T 7714 | 於德美 , 邵玉玲 , 冯超 et al. 玻璃纤维改良流态固化土的力学强度与水稳性研究 [J]. | 武汉理工大学学报 , 2024 , 46 (11) : 24-29 . |
| MLA | 於德美 et al. "玻璃纤维改良流态固化土的力学强度与水稳性研究" . | 武汉理工大学学报 46 . 11 (2024) : 24-29 . |
| APA | 於德美 , 邵玉玲 , 冯超 , 张恒春 , 张峰 , 王耀 et al. 玻璃纤维改良流态固化土的力学强度与水稳性研究 . | 武汉理工大学学报 , 2024 , 46 (11) , 24-29 . |
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Abstract ：
混凝土的力学特性和抗渗性能直接影响其服役耐久性，开展荷载、冻融等多因素耦合作用下混凝土力学和抗渗性能影响研究，有利于分析混凝土性能衰变机理。本文对道路混凝土采用氯盐溶液浸泡并同步施加动态荷载和冻融循环作用，并测试分析各侵蚀龄期混凝土抗弯拉强度、相对动弹性模量及表观扩散系数时变规律。结果表明，冻融循环作用下混凝土抗弯拉强度降低，循环荷载加速了冻融对混凝土的损伤。冻融循环使得混凝土抗渗性能显著下降。
Keyword ：
影响效应系数K 影响效应系数K 循环荷载 循环荷载 损伤因子R 损伤因子R 氯盐腐蚀 氯盐腐蚀 道路混凝土 道路混凝土
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| GB/T 7714 | 黄剑 , 李伟 , 於德美 et al. 循环荷载、氯盐与冻融多因素作用下混凝土力学及抗渗性能研究 [J]. | 福建建设科技 , 2023 , 4 (02) : 61-64 . |
| MLA | 黄剑 et al. "循环荷载、氯盐与冻融多因素作用下混凝土力学及抗渗性能研究" . | 福建建设科技 4 . 02 (2023) : 61-64 . |
| APA | 黄剑 , 李伟 , 於德美 , 付腾飞 . 循环荷载、氯盐与冻融多因素作用下混凝土力学及抗渗性能研究 . | 福建建设科技 , 2023 , 4 (02) , 61-64 . |
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氯盐及车辆动态荷载的存在使得水泥混凝土路面或桥梁等结构破坏严重。本文对道路混凝土采用氯盐溶液浸泡并同步施加动态荷载，并测试各侵蚀龄期混凝土不同深度自由氯离子含量。通过Fick第二定律解析解方程对氯离子浓度进行拟合，分析各因素对表观表面氯离子浓度C_s和表观扩散系数D_(app)时变规律的影响。引入效应系数K,分析不同氯盐浓度下动态荷载对混凝土抗氯离子渗透性能的影响。结果表明，动态循环荷载作用显著加速了氯离子的扩散，氯盐溶液浓度越大，同一深度自由氯离子含量越高。且随着侵蚀龄期的延长，K不断增大，混凝土抗侵蚀能力显著降低。
Keyword ：
动态循环荷载 动态循环荷载 影响效应系数K 影响效应系数K 氯盐腐蚀 氯盐腐蚀 道路混凝土 道路混凝土
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| GB/T 7714 | 黄剑 , 李伟 , 於德美 et al. 氯盐浓度与循环荷载对道路混凝土氯离子传输影响研究 [J]. | 福建建设科技 , 2023 , 4 (01) : 89-91,96 . |
| MLA | 黄剑 et al. "氯盐浓度与循环荷载对道路混凝土氯离子传输影响研究" . | 福建建设科技 4 . 01 (2023) : 89-91,96 . |
| APA | 黄剑 , 李伟 , 於德美 , 付腾飞 . 氯盐浓度与循环荷载对道路混凝土氯离子传输影响研究 . | 福建建设科技 , 2023 , 4 (01) , 89-91,96 . |
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The existence of chloride ions, sulfate ions, and vehicle dynamic loads may lead to a shortened service life and premature failure of the road and bridge structures in northwestern China. Immersed in a dual-salt solution while simultaneously applying cyclic flexural loads, the free chloride ion concentration and erosion depth in concrete specimens were measured. The influence of the sulfate concentration on the apparent surface chloride concentration (C-s) and apparent diffusion coefficient (D-app) was studied. An exponential model was used to fit the C-s, and the influence of sulfate concentration on the C-s was analyzed. The result showed that cyclic loading and solution concentration were two primary factors affecting chloride diffusion. Meanwhile, compared with the emersion conditions, dynamic loading would induce significantly accelerated chloride ion penetration. Under the coupling effect of sulfate and dynamic loading, as the sulfate concentration increased, the chloride ion concentration and erosion depth were both decreased. The existence of sulfate ions improved the chloride ion penetration resistance of concrete. The results provide insight in designing concrete in regions where multiple salt ingression (sulfate and chloride) is a major durability issue of the structures.
Keyword ：
chloride chloride concrete concrete coupling function coupling function cyclic cyclic dynamic flexural loading dynamic flexural loading ion transport ion transport sulfate sulfate
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| GB/T 7714 | Yu, Demei , Feng, Chao , Fu, Tengfei et al. Effect of Sulfate Concentration on Chloride Diffusion of Concrete under Cyclic Load [J]. | MATERIALS , 2022 , 15 (6) . |
| MLA | Yu, Demei et al. "Effect of Sulfate Concentration on Chloride Diffusion of Concrete under Cyclic Load" . | MATERIALS 15 . 6 (2022) . |
| APA | Yu, Demei , Feng, Chao , Fu, Tengfei , Shen, Aiqin . Effect of Sulfate Concentration on Chloride Diffusion of Concrete under Cyclic Load . | MATERIALS , 2022 , 15 (6) . |
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