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Journal of Clinical and Nursing Research 2024年第6期8卷 206-213页

作者： Fan Li Shun Yuan Chen Zhang Yan Li Qun Kong qingjun ding Qilu Institute of Technology Jinan 250200China

Objective:To explore the intervention effect of the Structured Health Education course and 5A nursing model for self-control of elderly patients with coronary heart ***:Using the random sampling method,124 elderly CAD patients admitted to the First Affiliated Hospital of Bengbu Medical University were randomly divided into an experimental group and a control *** control group line routine health education,experimental group take structured health education combined with 5A nursing before and after the intervention using a coronary heart disease assessment questionnaire,coronary heart disease self-control scale evaluation of two groups of intervention,compare two groups before and after intervention blood pressure,blood sugar,body mass index,lipid index level and complications within 8 months after ***:After the course intervention,the disease cognition and self-behavior of the experimental group were higher than that of the control group,and the differences were statistically significant(all P<0.1).Conclusion:This course is suitable for elderly patients with coronary heart *** 5A model improves the cognitive and management ability of elderly patients to a certain extent,which is worthy of clinical application.

关键词： Old age Coronary heart disease Self-control Structured health education 5A nursing

Mechanical Behavior Based on Aggregates Microstructure of Ultra-high Performance Concrete

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Journal of Wuhan University of Technology(Materials Science) 2024年第3期39卷 673-681页

作者：丁庆军 ZHOU Changsheng 张高展 GUO Hong LI Yang ZHANG Yongyuan GUO Kaizheng School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Advanced Building Materials Key Laboratory of Anhui Province School of Material Science and Chemical EngineeringAnhui Jianzhu UniversityHefei 230601China China Railway 17th Bureau Group Co. Ltd.Taiyuan 030006China

We developed ultra-high performance concrete(UHPC)incorporating mullite sand and brown corundum sand(BCS),and the quartz sand UHPC was utilized to prepare for *** properties of compressive strength,elastic modulus,ultrasonic pulse velocity,flexural strength,and toughness were *** electron microscopy and nanoindentation were also conducted to reveal the underlying mechanisms affecting macroscopic *** to the superior interface bonding properties between mullite sand and matrix,the compressive strength and flexural toughness of UHPC have been significantly *** sand and BCS aggregates have higher stiffness than quartz sand,contributing to the excellent elastic modulus exhibited by *** stiffness and volume of aggregates have a more significant impact on the elastic modulus of UHPC than interface performance,and the latter contributes more to the strength of *** study will provide a reference for developing UHPC with superior elastic modulus for structural engineering.

关键词： ultra-high performance concrete mechanical properties fine aggregates microstructure nanoindentation

碳酸化钢渣磷石膏复合胶凝材料及其力学性能研究

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混凝土 2024年第4期 58-62,102页

作者：刘凤东饶美娟丁庆军武汉理工大学材料科学与工程学院湖北武汉430070

为了提高磷石膏胶凝材料的力学性能,采用钢渣的碳酸化活性固化磷石膏制备了复合胶凝材料。研究了钢渣的碳酸化活性与钢渣与磷石膏相对比例对复合胶凝材料力学性能的影响,探讨了碳酸化钢渣和磷石膏之间的相互作用机制。研究表明:钢渣具... 详细信息

为了提高磷石膏胶凝材料的力学性能,采用钢渣的碳酸化活性固化磷石膏制备了复合胶凝材料。研究了钢渣的碳酸化活性与钢渣与磷石膏相对比例对复合胶凝材料力学性能的影响,探讨了碳酸化钢渣和磷石膏之间的相互作用机制。研究表明:钢渣具有极高的碳酸化活性,随着钢渣掺量的增加,复合胶凝材料力学性能显著提高;当钢渣掺量大于40%时,复合胶凝材料抗压强度大于70 MPa,软化系数大于0.87。机理分析表明:磷石膏粉隔离了钢渣粉,提高了钢渣粉颗粒间距,使单颗粒钢渣粉的碳酸化反应更为充分。同时钢渣碱性物质与磷石膏酸性物质中和会降低体系碱度,钢渣浸出的钙离子可结合磷石膏中氟离子和磷酸根离子,对有害离子起到化学固化作用。

关键词：磷石膏钢渣碳酸化活性力学性能

复掺碳酸钙晶须增强轻质ECC材料力学性能研究

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混凝土 2024年第7期 133-137页

作者：王博丁庆军王君邓建平武汉理工大学土木工程与建筑学院湖北武汉430070 武汉理工大学硅酸盐建筑材料国家重点实验室湖北武汉430070 中铁十六局集团第一工程有限公司北京101300

工程水泥基复合材料(ECC)由于其拉伸应变硬化行为和紧密多裂缝的独特特性能够满足混凝土基础设施韧性和耐久性的严格要求。使用粉煤灰漂珠代替细石英砂作为轻质细集料,使用国内高强高模量PVA和PE纤维,并复掺碳酸钙晶须对ECC进行多尺度增... 详细信息

工程水泥基复合材料(ECC)由于其拉伸应变硬化行为和紧密多裂缝的独特特性能够满足混凝土基础设施韧性和耐久性的严格要求。使用粉煤灰漂珠代替细石英砂作为轻质细集料,使用国内高强高模量PVA和PE纤维,并复掺碳酸钙晶须对ECC进行多尺度增强,对轻质ECC的强度、单轴拉伸性能、薄板四点弯曲性能和孔隙率等进行试验研究。结果表明:碳酸钙晶须掺量为体积的1%时最佳,PVA-ECC抗压强度为57 MPa,极限拉伸强度为4.31 MPa,拉伸应变为3.44%;而PE-ECC抗压强度为60.4 MPa,极限拉伸强度为4.77 MPa,拉伸应变为8.16%。适量的晶须掺入,能够优化孔隙结构,提升强度,晶须微观桥接作用可延缓了微观裂纹发展,同时晶须可以增加界面粗糙度,提高摩擦结合强度,从而提高ECC拉伸应变能力。

关键词：工程水泥基复合材料碳酸钙晶须力学性能

Dense packing properties of mineral admixtures in cementitious material

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Particuology 2009年第5期7卷 399-402页

作者： Yanzhou Peng Shuguang Hu qingjun ding College of Civil&Hydroelectric Engineering China Three Gorges UniversityYichang 443002China Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education Wuhan University of TechnologyWuhan 430070China

The effect of ultra-fine fly ash （UFFA）, steel slag （SS） and silica fume （SF） on packing density of binary, ternary and quaternary cementitious materials was studied in this paper in terms of minimum water requirement of cement. The influence of mineral admixtures on the relative density of pastes with low water/hinder ratios was analyzed and the relationship between paste density and compressive strength of the corresponding hardened mortars was discussed. The results indicate that the incorporation of mineral admixtures can effectively improve the packing density ofcementitious materials; the increase in packing density of a composite with incorporation of two or three kinds of mineral admixtures is even more obvious than that with only one mineral admixture. Moreover, an optimal amount of mineral admixture imparts to the mixture maximum packing density. The dense packing effect of a mineral admixture can increase the packing density of the resulting cementitious material and also the density of paste with low water/binder ratio, which evidently enhances the compressive strength of the hardened mortar.

关键词： Mineral admixture Dense packing effect Minimum water requirement Packing density Relative density of paste Compressive strength

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绿色建造下预拌混凝土原材料市场发展趋势

中外公路 2024年第5期44卷 269-276页

作者：丁虎丁庆军林皓鋆张珍湖南省第六工程有限公司武汉理工大学硅酸盐建筑材料国家重点实验室

面对泵送混凝土的传统原材料资源枯竭、生产过程能耗大、碳排放高、污染严重等情况以及中国土木工程行业实施绿色建造的大趋势，各种新的原材料逐渐被开发和推广，其质量、产量、社会认可度逐渐提高。优质天然河砂和卵石在原产地供不应... 详细信息

面对泵送混凝土的传统原材料资源枯竭、生产过程能耗大、碳排放高、污染严重等情况以及中国土木工程行业实施绿色建造的大趋势，各种新的原材料逐渐被开发和推广，其质量、产量、社会认可度逐渐提高。优质天然河砂和卵石在原产地供不应求，而老旧淤塞河道中尚可开采；使用大粒径天然卵石、石灰石、建筑垃圾等为原料生产的碎石和机制砂将成为新的替代品。水泥、粉煤灰、粒化高炉矿渣粉等原材料在生产企业进行转型升级并倾向于在交通便利地区集中建厂的过程中，导致平原、丘陵、山地等区域间供应不均衡的问题，因此，需根据施工所在地的供料情况，采取就地取材的策略。聚羧酸型缓凝高效减水剂以其高效、经济、相容性高、施工方便等优点已普及市场，还需进一步提升与机制砂等材料的适应性；而钙系和镁系膨胀剂对混凝土的补偿收缩需确保与混凝土收缩同步以控制收缩裂缝并避免结构胀裂。配制泵送混凝土需站在建筑全寿命周期的高度考察和改进各种原材料的性能并充分发挥原材料之间的组合效应。

关键词：泵送混凝土原材料资源枯竭绿色建造就地取材环境保护

高强预填集料混凝土灌浆料制备与灌注效果评价

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混凝土 2024年第4期 171-177页

作者：苏雷龚佳丽周孝军丁庆军谢琳淄博市建筑工程质量安全环保监督站山东淄博255000 西华大学建筑与土木工程学院四川成都610039 四川省钢管混凝土桥梁工程技术研究中心四川成都610041 武汉理工大学材料科学与工程学院湖北武汉430070

预填集料混凝土是在模板内预铺粗集料,然后注入灌浆料填充集料间隙而形成的一种新型混凝土。作为预填集料混凝土的重要组成部分,灌浆料的性能与灌注质量直接影响预填集料混凝土的整体性能,但现有灌浆料因流动度或强度不足,难以满足高强... 详细信息

预填集料混凝土是在模板内预铺粗集料,然后注入灌浆料填充集料间隙而形成的一种新型混凝土。作为预填集料混凝土的重要组成部分,灌浆料的性能与灌注质量直接影响预填集料混凝土的整体性能,但现有灌浆料因流动度或强度不足,难以满足高强预填集料混凝土的灌注要求。设计正交试验,探究了水胶比、胶砂比和胶凝材料体系对灌浆料工作性能与力学性能的影响规律,提出高强大流态灌浆料的制备方法,并采用重力灌注和泵送灌注进行了预填集料混凝土模拟灌注试验,从试件外观质量、灌注密实度和抗压强度等方面验证了灌浆料的灌注效果。结果表明:水胶比是影响灌浆料综合性能的主要因素,胶砂比主要影响灌浆料的流动性,双掺粉煤灰和硅灰可以协同提升灌浆料的工作性能与力学性能。高强预填集料混凝土采用泵送灌注效果优于重力灌注,相同条件下泵送灌注可达到更高密实度,但利用净浆或流动度较高的砂浆作为灌浆料时,重力灌注法也能达到较好密实灌注效果。采用0.3水胶比、双掺15%的粉煤灰和4%的硅灰,制备出流动度值为35 s的净浆,其28 d抗压强度为70.9 MPa,密实灌注的预填集料混凝土28 d抗压强度可达96.8 MPa。

关键词：预填集料混凝土灌浆料正交试验流动度密实度力学性能

Hydration Process of Cement-Based Materials by AC Impedance Method

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Journal of Wuhan University of Technology(Materials Science) 2015年第1期30卷 142-146页

作者：随春娥李悦 ding qingjun Trasportation Institute Inner Mongolia University School of Civil Engineering Beijing University of Technology School of Materials Science and Engineering Wuhan University of Technology

AC impedance is a new method to study the changes of pore structure and the hydration degree during the hydration and hardening process of cement paste by the change of the electrochemical parameters. Employing AC impedance method, we studied the hydration and hardening process of cement paste with fly ash and slag, and analyzed the influence of different hydration age, water-binder ratio and mineral admixture on the impedance parameters. Moreover, we compared the results with those by the conventional porosity testing method and X-ray diffraction method. The results showed that AC impedance could be taken as a new technology in cement and concrete research.

关键词： cement-based materials mineral admixture hydration process AC impedance

Heterogeneous Nature of Calcium Silicate Hydrate(C-S-H) Gel:A Molecular Dynamics Study

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Journal of Wuhan University of Technology(Materials Science) 2020年第2期35卷 435-440页

作者： JIN Shucheng LI Jinhui XU Wenyuan ding qingjun School of Civil Engineering Northeast Forestry UniversityHarbin 150040China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Structure and mechanical properties of Calcium silicate hydrate (C-S-H) at a molecular level act as "DNA" of cement-based construction *** order to understand loading resistance capability of C-S-H gel,research on molecular dynamics (MD) was carried out to simulate the uniaxial tension test on C-S-H model along x,y,and z *** to the structure and dynamic differences of the layered structure,the C-S-H model demonstrates heterogeneous mechanical *** an XY plane,the cohesive force can reach 4 GPa,which is mainly provided by the Ca-O and Si-O ionic-covalent *** good plasticity of calcium silicate sheet is attributed to the silicate branch structure formation and the recovery role of interlayer calcium ***,in z direction,C-S-H layers connected by the unstable H-bonds network,have the weakest tensile strength 2.2 *** results in the brittle failure mode in z *** relatively low tensile strength and poor plasticity in z direction provides molecular insights into the tensile weakness of cement materials at macro-level.

关键词： molecular dynamics calcium silicate hydrate uniaxial tension test

Comparative study of tribological properties of insulated and conductive polyimide composites

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Friction 2020年第3期8卷 507-516页

作者： Jingfu SONG Yuanhao YU Gai ZHAO Jinhao QIU qingjun ding College of Material Science and Technology Narijing Universiy of Aeronautics andAstronauticsNanjing 210016China Slate Key Laboratory of Mechanics and Control of Mechanical Sructures Nanjing University of Aeronauties and AstronauticsNanjing 210016China

Insulated polyimide(PI)composites filled with short glass fibers(SGF),polytetrafluoroethylene(PTFE),SiO2,and polyphenylene(PPL)are specially designed,prepared,and the tribological properties are systematically investigated with references to the special requirements for frictional materials used in ultrasonic *** hardness and thermal decomposition temperature of the insulated PI composites are comparable to that of conductive PI ***,these insulated materials present excellent friction and wear performance,especially under high loads and *** electron microscopy(SEM)analysis of the worn surface indicates that adhesive and fatigue wear dominate the wear mechanisms.

关键词： polyimide composites insulation friction wear