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学者姓名：季韬
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Abstract ：
为探究氧化钙和碳酸钠复合激发矿渣对碱激发水泥自收缩的影响机制,采用氧化钙和碳酸钠(摩尔比1∶1)为复合激发剂制备碱矿渣砂浆(AM),研究复合激发剂Na2O质量分数(CaO和Na2CO3反应生成的Na2O质量与矿渣质量比,为2.5％、4.5％、6.5％和8.5％)对AM自收缩的影响;通过XRD、TG-DTG、MIP和NMR分析其水化产物与微观结构.结果表明:随着Na2O质量分数的增加,激发剂反应耗水量增加,孔结构细化,孔隙压力增大;Al3+对C-(A)-S-H中Si4+的取代量增多导致Na+的吸附量增多,C-(A)-S-H滑移增大;水化程度提高,水化产物数量增多,AM的自收缩增大.Na2O质量分数为6.5％的AM为最优组,其力学性能高于普通硅酸盐水泥砂浆(OM),但由于较低的晶体含量和致密的孔结构,其自收缩大于OM.
Keyword ：
氧化钙 氧化钙 碱矿渣砂浆 碱矿渣砂浆 碳酸钠 碳酸钠 自收缩 自收缩
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| GB/T 7714 | 杨锦湖 , 林添琦 , 张检梅 et al. 氧化钙-碳酸钠复合激发矿渣砂浆的自收缩机制 [J]. | 哈尔滨工业大学学报 , 2024 , 56 (2) : 86-94 . |
| MLA | 杨锦湖 et al. "氧化钙-碳酸钠复合激发矿渣砂浆的自收缩机制" . | 哈尔滨工业大学学报 56 . 2 (2024) : 86-94 . |
| APA | 杨锦湖 , 林添琦 , 张检梅 , 陈徐东 , 季韬 . 氧化钙-碳酸钠复合激发矿渣砂浆的自收缩机制 . | 哈尔滨工业大学学报 , 2024 , 56 (2) , 86-94 . |
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In this study, high strength seawater coral aggregate concrete (SCAC) with a compressive strength of 80 MPa was prepared, and seawater coral aggregate reinforced concrete slab (SCARCS) was designed with epoxy-coated steel bars. Combining with the AE technology, monotonic flexural static tests were conducted on SCARCS specimens with three varying reinforcement ratios (i.e., 0.85%, 1.13%, and 1.41%). Results showed that the increasing the reinforcement ratio led to an increase in peak bearing capacity and a decrease in center deflections at the peak. The loading process can be divided into four stages based on the varying magnitudes of the b-value and Ib-value. The primary mode of failure was tensile microcracks at various stages, and the ratio of shear microcracks reached its maximum value in the final stage of loading. Besides, based on the signal intensity analysis, it can be observed that the scale and complexity of cracks propagation inside the SCARCS specimen increased as the reinforcement ratio rose. In addition, back propagation neural network (BPNN) classification model optimized by deep belief network (DBN) algorithm was proposed to predict the damage degree of SCARCS during loading, and the average prediction accuracy of the proposed model was shown to be over 89%. The classification outcomes demonstrated that with an increase in the reinforcement ratio of SCARCS, the proportion of AE signals in Cluster 3 increased, while the proportion of AE signals in Cluster 2 dropped. Notably, both the average frequency and energy presented an ascending trend. The findings of this study provided valuable insights for designing and assessing the safety of SCAC structures for essential island and reef engineering infrastructure.
Keyword ：
Acoustic emission (AE) Acoustic emission (AE) Deep belief network-back propagation neuralnetwork (DBN-BPNN) Deep belief network-back propagation neuralnetwork (DBN-BPNN) Failure mechanism Failure mechanism Parameter analysis Parameter analysis Seawater coral aggregate reinforced concrete alab (SCARCS) Seawater coral aggregate reinforced concrete alab (SCARCS)
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| GB/T 7714 | Shi, Dandan , Chen, Xudong , Chen, Peixin et al. Revealing the failure mechanism of high strength seawater coral aggregate reinforced concrete slabs based on acoustic emission technology: Parameter analysis and DBN-BPNN classification [J]. | ENGINEERING STRUCTURES , 2024 , 303 . |
| MLA | Shi, Dandan et al. "Revealing the failure mechanism of high strength seawater coral aggregate reinforced concrete slabs based on acoustic emission technology: Parameter analysis and DBN-BPNN classification" . | ENGINEERING STRUCTURES 303 (2024) . |
| APA | Shi, Dandan , Chen, Xudong , Chen, Peixin , Shang, Kai , Ji, Tao . Revealing the failure mechanism of high strength seawater coral aggregate reinforced concrete slabs based on acoustic emission technology: Parameter analysis and DBN-BPNN classification . | ENGINEERING STRUCTURES , 2024 , 303 . |
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To investigate the mechanism of the effect of calcium oxide and sodium carbonate activated slag on the autogenous shrinkage of alkali-activated cement, an alkali-activated slag martar (AM) was prepared using calcium oxide and sodium carbonate (molar ratio of 1∶ 1) as the combined activator. The effect of combined activator Na2O equivalent (i. e. the by weight ratio of Na2 O produced by the reaction of the combined activators to slag, i. e. 2. 5%, 4. 5%, 6. 5% and 8. 5%) on the autogenous shrinkage of AM was investigated. The hydration products and microstructure were characterized by X-ray diffraction, thermogravimetric analysis, mercury intrusion porosimetry, and nuclear magnetic resonance. The results indicate that with the increase of Na2O equivalent, the increase of water consumption due to the reaction of activators and pore structure refinement leads to the increase of pore pressure, and the amount of absorbed Na + increases due to the increase of amount of Si4 + in C - (A) - S - H replaced by Al3 + , resulting in the increase of C - (A) - S - H slippage. The increase of hydration degree induces the increase of the amount of hydration products, resulting in the increase of the autogenous shrinkage. AM with Na2O equivalent of 6. 5% is the best group with its mechanical properties higher than those of ordinary Portland cement mortar (OM), but its autogenous shrinkage greater than that of OM due to its lower crystal content and denser pore structure. © 2024 Harbin Institute of Technology. All rights reserved.
Keyword ：
Carbonation Carbonation Crystal structure Crystal structure Hydrated lime Hydrated lime Hydration Hydration Lime Lime Molar ratio Molar ratio Mortar Mortar Pore structure Pore structure Portland cement Portland cement Shrinkage Shrinkage Slags Slags Sodium Carbonate Sodium Carbonate Thermogravimetric analysis Thermogravimetric analysis
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| GB/T 7714 | Yang, Jinhu , Lin, Tianqi , Zhang, Jianmei et al. Mechanism of autogenous shrinkage of hybrid calcium oxide and sodium carbonate-activated slag mortars [J]. | Journal of Harbin Institute of Technology , 2024 , 56 (2) : 86-94 . |
| MLA | Yang, Jinhu et al. "Mechanism of autogenous shrinkage of hybrid calcium oxide and sodium carbonate-activated slag mortars" . | Journal of Harbin Institute of Technology 56 . 2 (2024) : 86-94 . |
| APA | Yang, Jinhu , Lin, Tianqi , Zhang, Jianmei , Chen, Xudong , Ji, Tao . Mechanism of autogenous shrinkage of hybrid calcium oxide and sodium carbonate-activated slag mortars . | Journal of Harbin Institute of Technology , 2024 , 56 (2) , 86-94 . |
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Solar-powered photocatalytic water splitting for hydrogen evolution presents a promising solution to the energy crisis and contemporary environmental challenges. Herein, a Z-scheme ZnS/LaTiO2N heterojunction composite, incorporating zinc vacancies, has been successfully synthesized to enable photocatalytic hydrogen evolution under visible-light illumination. The optimized ZnS(VZn)/LaTiO2N composite demonstrates a hydrogen evolution activity 13 times higher than that of individual ZnS(VZn). The heterojunction between ZnS and LaTiO2N, in conjunction with zinc vacancies, expands the photoresponse spectrum and facilitates the spatial separation and transfer of photogenerated carriers. Consequently, this synergy significantly enhances the performance of photocatalytic hydrogen evolution. The collaborative action of the Z-scheme heterojunction and zinc vacancies paves the way for innovative approaches in designing future high-efficiency photocatalysts.
Keyword ：
LaTiO2N LaTiO2N Photocatalytic H 2 evolution Photocatalytic H 2 evolution ZnS(VZn) ZnS(VZn) Z-scheme heterojunction Z-scheme heterojunction
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| GB/T 7714 | Yu, Jiaqi , Qi, Jinwei , Lin, Nansong et al. Zinc-vacancy mediated Z-scheme photocatalyst of ZnS/LaTiO2N for hydrogen evolution under visible-light [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2024 , 976 . |
| MLA | Yu, Jiaqi et al. "Zinc-vacancy mediated Z-scheme photocatalyst of ZnS/LaTiO2N for hydrogen evolution under visible-light" . | JOURNAL OF ALLOYS AND COMPOUNDS 976 (2024) . |
| APA | Yu, Jiaqi , Qi, Jinwei , Lin, Nansong , Zhang, Zizhong , Ji, Tao , Su, Wenyue . Zinc-vacancy mediated Z-scheme photocatalyst of ZnS/LaTiO2N for hydrogen evolution under visible-light . | JOURNAL OF ALLOYS AND COMPOUNDS , 2024 , 976 . |
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The accumulation of municipal solid waste incineration bottom ash (MSWI-BA) not only occupies land, but also leads to severe environmental pollution. In order to improve the utilization of MSWI-BA and reduce carbon emissions, the effect of alkali content on alkali-activated slag (AAS) paste containing 12% MSWI-BA under high-temperature exposure was studied. The alkali contents, i.e., the mass of Na2O in the water glass, were 2%-6% of the total mass of the precursors. The weight loss, thermal shrinkage, and strength of AAS were investigated. The results show that at the same heat treatment temperature, as the alkali content increases, the flexural and compressive strengths of AAS increase and then decrease, reaching the maximum at AAS with 4% alkali content (NS4). As the alkali content increases from 2% to 4%, the higher OH- concentration reduces the Ca dissolution of portlandite in MSWI-BA, resulting in a lower increase in Ca concentration than Si concentration. This leads to a decrease in Ca/Si and an increase in Al/Si of C A S H, which is beneficial for improving the structural stability of C S H after high temperature. When the alkaline content increases from 4% to 6%, excessive matrix shrinkage leads to an increase in microcracks. It was found that NS4 has the best high-temperature resistance and has good application prospects in engineering.
Keyword ：
Alkali-activated slag Alkali-activated slag Alkali content Alkali content High-temperature exposure High-temperature exposure Municipal solid waste incineration bottom ash (MSWI-BA) bottom ash Municipal solid waste incineration bottom ash (MSWI-BA) bottom ash
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| GB/T 7714 | Zhang, Binbin , Ma, Yu , Liang, Yongning et al. Effect of Alkali Content on the High-Temperature Behavior of Alkali-Activated Slag Paste Containing MSWI Bottom Ash [J]. | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (6) . |
| MLA | Zhang, Binbin et al. "Effect of Alkali Content on the High-Temperature Behavior of Alkali-Activated Slag Paste Containing MSWI Bottom Ash" . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING 36 . 6 (2024) . |
| APA | Zhang, Binbin , Ma, Yu , Liang, Yongning , Wang, Yao , Ji, Tao . Effect of Alkali Content on the High-Temperature Behavior of Alkali-Activated Slag Paste Containing MSWI Bottom Ash . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (6) . |
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The mechanical properties of tunnel support structures have been widely studied by researchers, but there are insufficient studies concerning energy mechanism and mechanical properties in the failure process of concrete and rock as binary composites. Based on this, this paper first analyzed the characteristics of stress-strain curves of sandstone ordinary concrete (SNC) and sandstone fiber-reinforced concrete (SFC) in disparate confining stresses. Next, the volume strain, dynamic elastic modulus, elastic-plastic strain, brittleness index, damage constitutive model, inward friction angle, and cohesion of specimens were explored under monotonic and cyclic loads. Finally, the failure mode and triaxial loading energy mechanism were studied based on computerized tomography (CT) detection. The consequences expounded that triaxial compression failure of sandstone concrete could be divided into four stages, and the compression of the specimen changed to expansion during loading. The elastic modulus of specimens increased when the confining pressure increased and decreased with the increase of fiber. As the confining pressure increased, the plastic strain of sandstone concrete at the final failure increased. The fiber was harmful to the growth of the elastic concrete modulus and the elastic modulus first increased and then decreased. With the confining pressure increasing, the brittleness index of concrete was smaller, and the fiber could efficiently prevent the concrete from cracking. As the strain increased, the rule of change with the increase of axial strain was "S". As the confining pressure decreased, the growth rate of the damage constitutive model rose variably. The cohesion of SFC was greater than SNC based on the analysis of the evolution of basic parameters. The pore and crack area after SNC compression failure was larger and deeper than that of SFC after compression failure. When the peak stress of specimens was maximal, the density of the elastic energy reached the maximum. The density of dissipated energy increased sharply after the peak stress.
Keyword ：
CT detection CT detection Energy dissipation Energy dissipation Failure mode Failure mode Mechanical characteristics Mechanical characteristics Sandstone-shotcrete Sandstone-shotcrete Triaxial loading Triaxial loading
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| GB/T 7714 | Luan, Jinjin , Chen, Xudong , Ji, Tao et al. Mechanical Behavior and Energy Dissipation of Sandstone-Shotcrete under Monotonic and Cyclic Triaxial Loading [J]. | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (4) . |
| MLA | Luan, Jinjin et al. "Mechanical Behavior and Energy Dissipation of Sandstone-Shotcrete under Monotonic and Cyclic Triaxial Loading" . | INTERNATIONAL JOURNAL OF GEOMECHANICS 24 . 4 (2024) . |
| APA | Luan, Jinjin , Chen, Xudong , Ji, Tao , Bai, Yin , Yu, Xin . Mechanical Behavior and Energy Dissipation of Sandstone-Shotcrete under Monotonic and Cyclic Triaxial Loading . | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (4) . |
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研究了加速碳化环境(CO_2浓度为20%)下，标准养护、饱和Ca(OH)_2溶液养护和蒸压养护对CaO+Na_2CO_3为激发剂的碱矿渣混凝土(CNC)中钢筋锈蚀的影响。结果表明，与标准养护相比，饱和Ca(OH)_2溶液养护不改变CNC的水化产物，但使其早期水化更加充分，因此平均孔径减小；蒸压养护使CNC水化产物由C-S-H凝胶转化为水榴石与11-?型的托勃莫来石，平均孔径和总孔隙率显著减小。在相同的加速碳化龄期下，与标准养护相比，饱和Ca(OH)_2溶液养护和蒸压养护的CNC碳化深度降低、CNC中钢筋发生高概率锈蚀时间延缓、钢筋失重率下降。与相同养护条件下的普通硅酸盐混凝土相比，标准养护和饱和Ca(OH)_2溶液养护的CNC中钢筋抗锈蚀能力远小于普通硅酸盐混凝土，而蒸压养护的CNC中钢筋抗锈蚀能力大于普通硅酸盐混凝土。
Keyword ：
养护制度 养护制度 失重率 失重率 孔结构 孔结构 电化学测试 电化学测试 碱矿渣混凝土 碱矿渣混凝土 碳化 碳化 钢筋锈蚀 钢筋锈蚀
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| GB/T 7714 | 梁咏宁 , 刘务东 , 赵凯 et al. 加速碳化条件下不同养护制度对碱矿渣混凝土钢筋锈蚀的影响 [J]. | 材料导报 , 2024 , 38 (11) : 162-169 . |
| MLA | 梁咏宁 et al. "加速碳化条件下不同养护制度对碱矿渣混凝土钢筋锈蚀的影响" . | 材料导报 38 . 11 (2024) : 162-169 . |
| APA | 梁咏宁 , 刘务东 , 赵凯 , 季韬 . 加速碳化条件下不同养护制度对碱矿渣混凝土钢筋锈蚀的影响 . | 材料导报 , 2024 , 38 (11) , 162-169 . |
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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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为探究生活垃圾焚烧炉渣(MSWI-BA)对碱矿渣净浆耐高温性能的影响机理，将6%的矿渣等质量替换为MSWI-BA,制备碱矿渣水泥净浆(AASBp),研究不同温度对AASBp的质量损失率、干燥收缩率和强度的影响.以普通硅酸盐水泥净浆作为对照组，结合多种微观手段，揭示AASBp的耐高温机理，并与未掺MSWI-BA的碱矿渣水泥(AASp)进行对比.结果表明：随着温度的升高，AASBp中水化硅铝酸钙的钙硅比(C/S)先降低后升高；在400℃时，水化硅铝酸钙的聚合度最高，C/S最低；Al—O键在600℃断裂，而Si—O键在1 000℃断裂；MSWI-BA可提高基体孔隙的连通性，高温处理后孔隙压力得到释放，因此AASBp比AASp具有更高的归一化抗压强度和耐高温性能.
Keyword ：
干燥收缩率 干燥收缩率 水化硅铝酸钙的聚合度 水化硅铝酸钙的聚合度 生活垃圾焚烧炉渣 生活垃圾焚烧炉渣 碱激发矿渣 碱激发矿渣 耐高温 耐高温
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| GB/T 7714 | 张彬彬 , 马宇 , 梁咏宁 et al. 含生活垃圾焚烧炉渣的碱矿渣水泥耐高温机理 [J]. | 福州大学学报(自然科学版) , 2024 , 52 (03) : 299-306 . |
| MLA | 张彬彬 et al. "含生活垃圾焚烧炉渣的碱矿渣水泥耐高温机理" . | 福州大学学报(自然科学版) 52 . 03 (2024) : 299-306 . |
| APA | 张彬彬 , 马宇 , 梁咏宁 , 林毅武 , 季韬 . 含生活垃圾焚烧炉渣的碱矿渣水泥耐高温机理 . | 福州大学学报(自然科学版) , 2024 , 52 (03) , 299-306 . |
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环境中微生物的化学和代谢活动会造成混凝土结构的劣化。在生物硫酸(T.f细菌,pH=1.1)下,本文探究水泥类型和阻锈剂对人工鱼礁混凝土(ARC)钢筋处孔隙液pH值、腐蚀电位、腐蚀电流及锈蚀率的影响,结合孔结构、SEM-EDS、XRD和IR揭示其机理。结果表明:与采用普通硅酸盐水泥的ARC相比,使用硫铝酸盐水泥(SAC)的ARC,其孔隙充满更多的AFt,孔结构更加致密,经生物硫酸腐蚀后,完全疏松区和部分疏松区的石膏衍射峰强度较低,这对未完全溶解水化产物的撕拉作用较小,且在部分疏松区仍存在Ca-O键,抗生物硫酸腐蚀能力更强;采用SAC和阻锈剂,ARC钢筋处孔隙液pH值减小速率最低,且腐蚀84 d后,腐蚀电位最高,腐蚀电流和锈蚀率最低,具有最好的耐生物硫酸腐蚀性能。
Keyword ：
人工鱼礁混凝土 人工鱼礁混凝土 生物硫酸 生物硫酸 硫铝酸盐水泥 硫铝酸盐水泥 钢筋锈蚀 钢筋锈蚀 阻锈剂 阻锈剂
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| GB/T 7714 | 周阳升 , 陈彩艺 , 梁咏宁 et al. 人工鱼礁混凝土抗生物硫酸腐蚀机理 [C] //第十届海洋材料与腐蚀防护大会暨第四届钢筋混凝土耐久性与设施服役安全大会 . 2024 . |
| MLA | 周阳升 et al. "人工鱼礁混凝土抗生物硫酸腐蚀机理" 第十届海洋材料与腐蚀防护大会暨第四届钢筋混凝土耐久性与设施服役安全大会 . (2024) . |
| APA | 周阳升 , 陈彩艺 , 梁咏宁 , 季韬 . 人工鱼礁混凝土抗生物硫酸腐蚀机理 第十届海洋材料与腐蚀防护大会暨第四届钢筋混凝土耐久性与设施服役安全大会 . (2024) . |
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