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| 1 | 硅烷改性混凝土防水和抗氯离子性能试验研究显示文摘通过中子成像试验、吸水试验和氯离子侵蚀试验,研究无裂缝和带裂缝情况下硅烷改性混凝土的防水和抗氯离子侵蚀性能。试验结果表明,中子成像能够清晰观测未掺硅烷试件的快速吸水过程,而掺加硅烷后在毛细孔隙壁上形成的憎水膜能够有效抑制液态水分侵入,中子成像观测不到肉眼可见的水分前锋,吸水量降为未掺硅烷时的13%,显示出良好的防水性能。硅烷在水泥基体中的水解缩合反应并不堵塞毛细孔隙,保持'可呼吸性'。未改性试件一旦开裂,水在瞬间充满裂缝继而向裂缝两侧入侵,而硅烷改性试件即使开裂宽度达0.3mm,也无明显水分运动,裂缝在0.1mm~0.4mm扩展时不削弱其整体防水效果。良好的防水性能决定了硅烷改性混凝土无论是在无裂缝还是带裂缝情况下都具有良好的抗氯离子侵蚀能力。掺加硅烷改性是提高混凝土材料防水和抗氯离子侵蚀能力,进而提高其耐久性的有效途径。 | 张鹏 赵铁军 戴建国 郭平功 Wittmann F H | 2011 | 土木工程学报2011，44，3： | 37 |
| 2 | Association between autoimmune pancreatitis and systemic autoimmune diseases显示文摘AIM: To investigate the association between autoimmune pancreatitis (AIP) and systemic autoimmune diseases (SAIDs) by measurement of serum immunoglobulin G4 (IgG4). METHODS: The serum level of IgG4 was measured in 61 patients with SAIDs of different types who had not yet participated in glucocorticosteroid treatment. Patients with an elevated IgG4 level were examined by abdominal ultrasonography (US) and, in some cases, by computer tomography (CT). RESULTS: Elevated serum IgG4 levels (919 ± 996 mg/L) were detected in 17 (28%) of the 61 SAID patients. 10 patients had Sj gren's syndrome (SS) (IgG4: 590 ± 232 mg/L), 2 of them in association with Hashimoto's thyroiditis, and 7 patients (IgG4: 1388 ± 985.5 mg/L) had systemic lupus erythematosus (SLE). The IgG4 level in the SLE patients and that in patients with SS were not significantly different from that in AIP patients (783 ± 522 mg/L). Abdominal US and CT did not reveal any characteristic features of AIP among the SAID patients with an elevated IgG4 level. CONCLUSION: The serum IgG4 level may be elevated in SAIDs without the presence of AIP. The determination of serum IgG4 does not seem to be suitable for the differentiation between IgG4-related diseases and SAIDs. | Viktória Terzin Imre Fldesi László Kovács Gyula Pokorny Tibor Wittmann László Czakó | 2012 | World Journal of Gastroenterology2012，18，21： | 9 |
| 3 | 海水环境下混凝土的断裂能及其应变软化显示文摘通过带切口梁的三点弯曲试验和楔形劈拉试验,对完全干燥、半干燥、水浸泡、海水浸泡和5%、23.4%NaCl溶液浸泡的6种不同含水状态的混凝土试件进行了测试,根据荷载-位移曲线和逆向分析,计算得到混凝土的断裂能及其应变软化曲线。结果表明,随着混凝土中水、海水和高浓度盐溶液的侵入,孔隙溶液中液体的表面张力不断增大,造成表面能下降,承载力随之降低,水浸泡后混凝土的最大承载力较干燥时降低19.6%(三点弯曲)和14.5%(楔形劈拉),海水浸泡后下降28.9%和21.7%,高浓度盐溶液浸泡后降幅更大;海水和盐溶液浸泡时后,混凝土断裂能损失24%以上,软化阶段的开裂韧性也明显降低,裂缝更易形成和扩展。从表面能、断裂能和应变软化的角度研究了海水侵入对混凝土材料造成的不利影响。 | 张鹏 孙志伟 赵铁军 Wittmann F H | 2010 | 土木建筑与环境工程2010，，1： | 9 |
| 4 | 开裂混凝土中水分侵入过程的可视化追踪及其特征分析显示文摘采用热中子辐射成像技术,对开裂混凝土中的水分侵入过程进行了试验研究与特征分析。结果表明:中子成像能够突破混凝土材料的非透明性局限,实现对开裂混凝土中水分侵入过程的可视化追踪和水分空间分布的定量计算;水分在开裂混凝土中不仅由与水初始接触面沿垂直方向推进,而且还沿裂缝两侧向其水平方向,以及钢筋与水泥基体界面外围方向同时入侵;裂缝区和钢筋与水泥基体界面区成为水分持续侵入的二次水源;水分侵入初期约2h内,根据试验中裂缝宽度为0.35mm试件的中子图像估算的水分侵入量与称量法测得的水分侵入量基本一致。 | 张鹏 赵铁军 WITTMANN F H LEHMANN E 金祖权 VONTOBEL P | 2010 | 硅酸盐学报2010，38，4： | 8 |
| 5 | Visualization and quantification of water movement in porous cement-based materials by real time thermal neutron radiography:Theoretical analysis and experimental study显示文摘Water movement in porous cement-based materials is of great importance when studying their deterioration processes and durability.Many traditional methods based on mass changes,electricity or nuclear magnetic resonances are available for studying water transport in cement-based materials.In this research,an advanced technique i.e.thermal neutron radiography was utilized to achieve visualization and quantification of time dependent water movement including water penetration and moisture vapor in porous cement-based materials through theoretical analysis and experimental study.Because thermal neutrons ex-perience a strong attenuation by hydrogen,neutron radiography exhibits high sensitivity to small amounts of water.A neutron transmission analysis for quantitative evaluation of raw radiographic measurements was developed and optimized based on point scattered functions(PScF).The determinations of the real time and space dependent water penetration into uncracked and cracked mortar samples,as well as the drying process have been presented in this paper.It is illustrated that thermal neutron radiography can be a useful research tool for visualization and quantification of water movement in porous building materials.The obtained results will help us to better understand deteriorating processes of cement-based materials and to find ways to improve their durability. | ZHANG Peng1,WITTMANN F H1,2,ZHAO TieJun1,LEHMANN E3 & JIN ZuQuan1 1 Center for Durability & Sustainability Studies of Shandong Province,Qingdao Technological University,Qingdao 266033,China 2 Aedificat Institute Freiburg,Freiburg D-79100,Germany 3 Department of Spallation Neutron Source(ASQ),Paul Scherrer Institute,Villigen PSI CH-5232,Switzerland | 2010 | Science China(Technological Sciences)2010，53，5： | 6 |
| 6 | 基于氯离子分布的氯离子渗透参数计算的新方法显示文摘根据混凝土中氯离子的分布对氯离子侵入性能进行评价时,混凝土粉末样品的采集,氯离子含量的测试和表达方式,均可对评价结果产生影响。在干湿循环条件下,以理论上的表面氯离子浓度为主要评价参数对氯离子的渗透性能进行评价的方法不尽合理。通过对暴露26年后的青岛北海船厂码头中大量的混凝土芯样中氯离子分布的分析和计算,结合其它文献中氯离子分布的数据,提出了以扩散区与对流区界面为扩散表面,以界面处的氯离子浓度为扩散表面浓度,评价氯离子侵入性能和进行寿命预测的方法。 | 范宏 赵铁军 F H Wittmann | 2006 | 港工技术2006，43，3： | 2 |
| 7 | Size effect of fracture energy of concrete 显示文摘 | Wittmann F H | 1990 | Engineering Fracture Mechanics1990，35，123： | 1 |
| 8 | Simulation and analysis of composite structures 显示文摘 | Wittmann F H Roelfstra P E Sadouki H | 1984 | Materials Science and Engineering1984，68，： | 1 |
| 9 | Neutron imag- ing of water penetration into cracked steel reinforced concrete显示文摘 | ZHANG Peng WITTMANN F H ZHAO Tie-jun | 2010 | Physic B : Condensed Matter2010，405，7： | 1 |
| 10 | Water repellent surface impregnation for extension of service life of reinforced concrete structmes in marine environments:the role of cracks显示文摘 | Dai J G Akira Y Wittmann F H | 2010 | Cement and Concrete Composites2010，32，2： | 1 |
| 11 | Fracture of autoclaved aerated concrete显示文摘 | WITTMANN F H GHEORGHITA I | 1984 | Cement and Concrete Research1984，，14： | 1 |
| 12 | Interaction of Hardened Cement Paste and Water显示文摘 | F H Wittmann | 1972 | Journal of the American Ceramic Society1972，56，8： | 1 |
| 13 | Estimation of the modulus of elasticity of calcium hydroxide显示文摘 | WITTMANN F H | 1986 | Cement and Concrete Research1986，16，6： | 1 |
| 14 | Nachweis der wirksamkeit einer realkalisierenden maβnahme显示文摘 | Wittmann F H Lunk P Gerdes A | 2002 | Int J Restoration of Buildings and Monuments2002，，8： | 1 |
| 15 | Explanation of size effect in concrete fracture using non-uniform energy distribution显示文摘 | Duan K Hu X Z Wittmann F H | 2002 | Mater Struct2002，35，： | 1 |
| 16 | Water repellent surface impregnation for extending the service life of reinforced concrete structures in marine environments: The role of cracks 显示文摘 | Dai J G Akira Y Wittmann F H | 2010 | Cement and Concrete Composites2010，，32： | 1 |
| 17 | Thickness effect on fracture energy of cementitious materials显示文摘 | Duan K Hu X Z Wittmann F H | 2003 | Cem Coner Res2003，33，4： | 1 |
| 18 | Boundary effect on concrete fracture and non-constant fracture energy distribution显示文摘 | Duan K Hu X Z Wittmann F H | 2003 | Eng Fraet Mech2003，70，： | 1 |
| 19 | Boundary effect on concrete fracture and non-constant fracture energy distributiOn显示文摘 | DUAN Kai HU Xiao-zhi WITTMANN F H | 2003 | Engineering Fracture Mechanics2003，70，： | 1 |
| 20 | An analytical method to determine the bridging stress transferred within the fi'acture process zone 显示文摘 | Hu Xiaozhi Wittmann F H | 1991 | Cement and Concrete Research1991，21，6： | 1 |
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