检索结果-南通市图书馆

The Influence of limestone Powder and Metakaolin Co-Blending on the Hydration Process and Mechanical Properties of Q-Phase Cement

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1169-1176页

作者： XIONG Xuan HE Yongjia lülinnü MA Jie WANG Fazhou State Key laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan 430070China China Railway Design Corporation Tianjin 300250China

A ternary system comprising Ca_(20)Al_(26)Mg_(3)Si_(3)O_(68)(Q-phase),limestone,and metakaolin is proposed,and its hydration behavior,hydration product phases,microstructure,and mechanical properties are investigated and compared with pure Q-phase *** results indicate that the ternary system exhibits exceptional and sustained compressive strength even under a 40℃environment,significantly outperforming pure *** mechanism lies in that metakaolin effectively inhibits the transformation of metastable ***,the interactions among Q-phase,limestone,and metakaolin further enhance the cementitious *** ternary system effectively addresses potential issues of strength loss in Q-phase cement application,and as a low-carbon cementitious material system,it holds promising potential applications.

关键词： Q-phase limestone metakaolin hydration compressive strength

Ceramsite Containing Iron Oxide and its Use as Functional Aggregate in Microwave Absorbing Cement-based Materials

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2018年第1期33卷 133-138页

作者：何永佳 lI Guangfeng 李洪斌 lü linnü HE liu State Key laboratory of Silicate Materials for Architectures Wuhan University of Technology School of Materials Science and Engineering Wuhan University of Technology Hubei Key laboratory of Theory and Application of Advanced Materials Mechanics School of Science Wuhan University of Technology China Railway Eleventh Bureau Group Fifth Engineering Co. Ltd.

Electromagnetic（EM） wave absorbing cement-based composite has promising applications in protecting civil and military buildings from electromagnetic interferences. A new idea of preparing EM wave absorbing cement-based composite is proposed by using ceramsite containing iron oxide as EM wave absorbing functional aggregate. The ceramsite was synthesized by adding 10 wt% Fe3O4 into clay and sintering at 1 200 ℃, which shows obvious dielectric and magnetic loss properties for electromagnetic wave. The maximum reflection loss（Rl） of the concrete specimens prepared with the ceramsite is between-10.2--10.7 dB（corresponding to absorption greater than 90% EM energy） in the bandwidth of 8-18 GHz. In addition, the compressive strength at 28 days age of the concrete is 46 MPa, showing the potentiality of being used as structural components in buildings.

关键词： electromagnetic absorption iron oxide ceramsite functional aggregate concrete

Effect of Calcium Silicate Hydrate Seeds on Hydration and Mechanical Properties of Cement

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2021年第1期36卷 103-110页

作者： WANG Yisa lülinnü HE Yongjia WANG Fazhou HU Shuguang Hubei Key laboratory of Theory and Application of Advanced Materials Mechanics(School of Science Wuhan University of Technology)Wuhan 430070China State Key laboratory of Silicate Materials for Architectures(Wuhan University of Technology) Wuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

C-S-H series are synthesized at different temperatures and ages by pozzolanic *** change of particle size distribution,phase composition,morphology and nanostructure of C-S-H with temperatures and ages,and the effects of C-S-H seeds and seeds parameters on the hydration behavior and mechanical properties development of cement were investigated by DlS,XRD,SEM,^(29)Si NMR,TAM-air isothermal calorimeter and mechanical properties *** results show that the particle size,crystallinity,basal spacing and Q^(2)/Q^(1) ratio of C-S-H increases with the increase of synthesis temperature and *** addition of synthesized C-S-H seeds to cement pastes results in the strong acceleration effect on cement hydration and significant improvement of the early strength of cement paste and *** 1 day-C-S-H seeds synthesized at room temperature can increase the strength of cement paste by about 30 MPa at 12 *** effect does not show a very regular change with the increase of the temperature and age of seeds *** the effect of C-S-H seeds on the hydration and mechanical properties of cement,and economy and short cycle of seeds synthesis,the C-S-H seeds synthesized at room temperature for 1 day or 55 ℃ water bath for 12 hours is recommended..

关键词： calcium silicate hydrate(C-S-H) seeds hydration mechanical property temperature

Effects of Steam Curing on the Resistance of Cementitious Materials to Chloride Penetration

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 885-891页

作者： CHEN Xuefei HE Yongjia lü linnü ZHANG Xulong HU Shuguang State Key laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan430070China Hubei Key laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan430070China Hubei Provincial Academy of Building Research and Design Co. LtdWuhan430071China

The resistance to chloride penetration of cement-based material with different curing regimes was investigated by solution titration,XRD,lF-NMR and rapid chloride migration *** results show that the curing regime has influences on the types and structure of the hydration products,which in turn affects their ability to bind chloride *** binding capacity of cementitious materials to chloride ions,porosity and chloride ion migration coefficient increased with the increase of water-cement ratio,while steam curing increased the porosity and chloride ion migration coefficient at the same time as it increased the chloride ion binding capacity of the *** lower water-cement ratios,the effect of steam curing on the resistance of cementitious materials to chloride ingress is negligible.

关键词： chloride penetration chloride binding capacity pore structure steam curing cementitious materials

水泥石脱水相结构特征及其再水化能力(英文)

在线全文

学校读者我要写书评

暂无评论

硅酸盐学报 2008年第10期36卷 1343-1347页

作者：吕林女何永佳胡曙光武汉理工大学理学院硅酸盐材料工程教育部重点实验室武汉430070

将水泥石在不同温度进行低温煅烧,得到不同的脱水相物质,通过热重–差示扫描热分析、X射线衍射、红外光谱及29Si核磁共振等对水泥石在400,650℃及900℃的脱水相结构特征及其再水化性能、再水化产物的结构特征进行研究。结果表明:在400℃... 详细信息

将水泥石在不同温度进行低温煅烧,得到不同的脱水相物质,通过热重–差示扫描热分析、X射线衍射、红外光谱及29Si核磁共振等对水泥石在400,650℃及900℃的脱水相结构特征及其再水化性能、再水化产物的结构特征进行研究。结果表明:在400℃,由水化硅酸钙(C–S–H)凝胶脱水生成了无定形相,在650℃生成了不完全结晶的β-硅酸二钙(C2S),而900℃脱水相中存在结晶程度高的β-C2S。在再水化过程中,400℃和650℃脱水相水化生成了C–S–H凝胶,并且650℃脱水相的水化活性和水化产物聚合程度更高;900℃脱水相的水化活性极低,水化前后矿物结构特征几乎没有发生变化。

关键词：水泥石脱水相结构特征:再水化水化活性

在线全文

学校读者我要写书评

暂无评论

蒸养条件下预制混凝土抗冻性能试验研究

混凝土 2019年第9期 104-107页

作者：曹源郑立霞吕林女重庆水利电力职业技术学院重庆402106 武汉理工大学湖北武汉430070

对分别在-1、-5、-10、-15℃环境温度下静置1 h时后,再在特定蒸养条件(湿度90%~100%环境下,以20℃/h速度升温至65℃,恒温3.5 h,最后自然降温)下蒸养的混凝土抗冻性能进行了试验研究,分别得到了它们在不掺加防冻剂和防冻剂为最佳掺量情... 详细信息

对分别在-1、-5、-10、-15℃环境温度下静置1 h时后,再在特定蒸养条件(湿度90%~100%环境下,以20℃/h速度升温至65℃,恒温3.5 h,最后自然降温)下蒸养的混凝土抗冻性能进行了试验研究,分别得到了它们在不掺加防冻剂和防冻剂为最佳掺量情况下的抗压强度损失与冻融循环次数的关系,从而为预制构件在冬季施工及使用提供理了论依据和技术支撑。

关键词：蒸养条件预制混凝土抗冻性能试验研究

多基复合管在制备中的管芯混凝土收缩性能分析

在线全文

学校读者我要写书评

暂无评论

混凝土 2016年第9期 114-116,123页

作者：李鹏吕泳李卓球吕林女武汉理工大学理学院湖北武汉430070

对多基复合管成型过程中的管芯混凝土的固化收缩变形与弹性模量变化等开展了相关试验研究,由此建立了管芯混凝土收缩与变弹性模量预测模型。通过迭代算法,对多基复合管成型过程中管芯混凝土的收缩性能进行了研究与分析。结果表明:该分... 详细信息

对多基复合管成型过程中的管芯混凝土的固化收缩变形与弹性模量变化等开展了相关试验研究,由此建立了管芯混凝土收缩与变弹性模量预测模型。通过迭代算法,对多基复合管成型过程中管芯混凝土的收缩性能进行了研究与分析。结果表明:该分析模型与方法能合理地描述管芯混凝土收缩过程中对内筒体产生的附加外力随时间变化的关系,为多基复合管结构优化设计提供理论指导。

关键词：多基复合管混凝土收缩变弹性模量预测收缩性能

在线全文

学校读者我要写书评

暂无评论

免振捣高性能混凝土的研究

铁道建筑 2006年第10期46卷 97-100页

作者：何永佳胡曙光吕林女武汉理工大学硅酸盐材料工程教育部重点实验室武汉430070 武汉理工大学工程结构与力学系武汉430070

从免振捣高性能混凝土的配比设计方法、原材料选择、流变学特征和工作性能测试方法、硬化免振捣混凝土的物理力学性能、体积变形性能、耐久性能,以及免振捣混凝土的工程应用、存在的问题和发展前景等方面进行了探讨和论述。认为配制免... 详细信息

从免振捣高性能混凝土的配比设计方法、原材料选择、流变学特征和工作性能测试方法、硬化免振捣混凝土的物理力学性能、体积变形性能、耐久性能,以及免振捣混凝土的工程应用、存在的问题和发展前景等方面进行了探讨和论述。认为配制免振捣高性能混凝土宜采用体积法或改进后的体积法。

关键词：免振捣高性能混凝土配制应用

Beginning from the end:the presynaptic terminal as a pathomechanism hub in frontotemporal dementia and amyotrophic lateral sclerosis

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第11期20卷 3217-3218页

作者： laura Huggon Emma l.Clayton UK Dementia Research Institute at King’s College london LondonUK Department of Basic and Clinical Neuroscience Institute of Psychiatry Psychology&NeuroscienceKing’s College LondonLondonUK

Frontotemporal dementia and amyotrophic lateral sclerosis:Frontotemporal dementia(F T D)and amyo t rophic lateral sclerosis(AlS)are neurodegenerative diseases with significant overlapping *** these neurodegenerative diseases affect different neuronal populations(with FTD affecting neurons of the frontal and temporal lobes,and AlS affecting upper and lower motor neurons),these two diseases are complexly *** and AlS exist on a disease spectrum,with shared genetic causes,clinical presentations,and pathologies.

关键词： diseases amyotrophic sclerosis