孙伟
高性能与超高性能混凝土材料、高性能与超高性能纤维增强水泥基复合材料
个性化签名
- 姓名:孙伟
- 目前身份:
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学术头衔:
博士生导师
- 职称:-
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学科领域:
土木建筑工程设计
- 研究兴趣:高性能与超高性能混凝土材料、高性能与超高性能纤维增强水泥基复合材料
孙伟,教授,博士生导师,土木工程材料学科带头人。是中国《硅酸盐学报》副主编、中国《建筑材料学报》编委、《混凝土与水泥制品》编委会高级顾问、前任英国《Cement and Concrete Research》编委会委员;中国建筑材料科技教育委员会委员、中国水泥制品协会理事、中国土木工程学会纤维混凝土委员会、高性能 混凝土委员会委员、江苏省复合材料学会常务理事、南京市硅酸盐学会理事长等。 孙伟教授长期致力于高性能与超高性能混凝土材料、高性能与超高性能纤维增强水泥基复合材料的基本理论研究、重大工程应用和高层次人才培养工作。先后承担了国家自然科学基金面上项目和重点项目、国家“八五“、“九五“攻关项目的专题研究,国家西部大开发863专项基金“青藏高原严酷环境中高性能水泥基材料的研究与应用“,国家重点基础研究发展规划973项目“高性能水泥“中“高性能水泥基材料在碱--集料反应与其他破坏因素协同作用下的损伤失效过程与机理“和省部级科研项目;长江三峡大坝、南京第二长江大桥、南京地下铁道、润扬长江公路大桥、苏通大桥等重大工程项目和中国人民解放军二炮军工项目等共30多项。作为第一发明人获国家发明奖一项;国家发明专利一项;省部级自然科学奖、科技进步奖8项。发表论文250多篇,被SCI收录40篇、EI收录50多篇、SCI引用100多篇次。主编英文版国际会议论文集一部、合作撰写专著2部、主编和参编国家和省部级技术规程5部。培养博士研究生29名、硕士研究生27名。先后与美国密西根大学A.E.Naaman教授、美国西北大学S.P.Shah教授、加拿大不列颠哥伦比亚大学N.Banthia教授、德国斯图加特大学H.W.Reinhardt教授、荷兰德尔菲特工业大学P.Stroeven教授、香港科技大学李宗津博士等国外和境外著名大学的教授开展了国际科技合作与交流及联合培养博士生,大大促进了学科的建设与发展,提高了人才培养的质量。
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11
孙伟, Sun Wei a, *, Yan Handong a, b, Zhan Binggen a
Cement and Concrete Research 33(2003)1119-1125,-0001,():
-1年11月30日
The addition of ufitratine powder (UFP)to concrete can improve the fluidity of concrete, showing a water-reducing effect The aim of this article was to analyze the water-reducing mechanism of UFP both experimentally and theoretically. Three UFPs-fine ground slag. highcalcium fly ash, and low-calcium fly ash--weN chosen for the study. The contrastive experiments were done to investigate the fluidity of mortars with 30%, 45%, 60%. and 75% equivalent cement replaced by fine ground slag. high-calcium fly ash. and low-calcium fly ash. respectively. The results showed the physical and chemical characteristic of the powder, such as their grain morphology, glass phase activities, densities, specific areas, and their groin eumuhdng conditions, can strongly affect their water-reducing effect.
Workability, Admixture, Cement paste, Fly ash, Granulated blast-fumace slag
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孙伟, Wei Sun a, *, Ru Mu b, Xin Luo a, Changwen Miao b
Cement and Concrete Research 32(2002)1859-1864,-0001,():
-1年11月30日
The effect of sodium chloride solution, freeze-thaw cycling and externally applied load on the performance of concrete was experimentally investigated. The results show that the concrete specimens subjected to freeze-thaw cycling scaled more severely in chloride sah solution than those in water, and weight losses oftbe specimens tested in chloride salt solution were twice as much as those tested in water, However. dynamic modulus of elasticity of the concrete specimens deceased more slowly in chloride salt solution than in water due to the decline in the freezing point of the chloride salt solution compared with water, tt is also shown that the performance deterioration in the concrete suhjected to muhidamaging processes was significantly accelerated. The larger the stress ratios, the fewer freeze-thaw cycles the concrete contd bear. When steel fiber is incorporated, performance degradation in the steel fiber-reinforced concrete exposed to the mubidamaging processes could be considerably retarded.
Degradatinn, Chloride salt, Preeze-thaw cycling, Externally applied load, Steel fiber
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【期刊论文】基于可靠度与损伤理论的混凝土寿命预测模型Ⅱ: 模型验证与应用
孙伟, 关宇刚, 缪昌文
硅酸盐学报,2001,29(6):535~540,-0001,():
-1年11月30日
作为混凝土寿命预测普适模型的应用篇,介绍了模型在冻融作用下的具体应用,根据该模型,提出了适用于冻融条件(包括复合其它因素)作用下的混凝土的多元Weibull冻融的损伤模型;同时,展开了快速冻融以及硫酸铵侵蚀与冻融复合作用下的耐久性实验,并根据实验结果对冻融模型进了验证,并与神经元计算方法进行了比较,结果表明,该模型在冻融条件下的应用是成功的。另外,为了实现模型由实验室条件向实际工程应用的跨越,本文提出了模型的实际应用方法并根据该方法对北京十三陵抽水蓄能电站这一现场环境下混凝土的寿命进行了数值模信,从而为实际复杂环境下的混凝土寿合评估提供了一个新思路和新方法,具有一定的应用推广价值。
混凝土, 硫酸铵, 冻融循环, 寿命预测, 模型
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【期刊论文】基于可靠度与损伤理论的混凝土寿命预测模型Ⅰ: 模型阐述与建立
孙伟, 关宇刚, 缪昌文
硅酸盐学报,2001,26(6):530~534,-0001,():
-1年11月30日
如何对混凝土进行寿命预测及评估是一个至今尚未解决的国际重大科技问题,实现混凝土的寿命设计必将有力地推动混凝土科技的发展。针对混凝土的耐久未失效过程实质是一个内部损伤演变的逐步劣化过程这一事实,本工作结合了可靠度与损伤理论,首次提出了能适用于不同边界条件以及包括单因素和多因素复合作用下的更加符合实际的有关混凝土寿命预测方面的普适多元Weibull分布模型;并为了该模型的具体应用,采用网格部分的手段,提出了相应的算法和编制了对应的计算程序;最后对该模型作了进一步的补充说明,从而为混凝土的寿合设计提供了一个新民路和新方法,其对于混凝土的寿命设计具有一定的启发指导意义。
混凝土, 寿命预测, 损伤, 算法, 预测模型
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【期刊论文】钢纤维高强水泥基复合材料的界面效应及其疲劳特性的研究
孙伟, 严云
硅酸盐学报,1994,22(2):107~116,-0001,():
-1年11月30日
通过综合分析提出,钢纤维与水泥基体、集料与水泥浆的界面层不仅可以改善和强化,而且经过有效地调整界同区的组成和结构,界面层及其薄弱特征完全能够消失,并且还有再强化的可能,再强化程度则与界面区组成结构密切相关,这是扩大纤维效应范围、强化空间随机叠加、配制高性能水泥基复合材料的理论基础,本工作还研究了界面效应与高强混凝土、钢纤维高强水泥基复合材料在反复荷载作用下疲劳特性的关系。实验结果表明,因钢纤维与硅灰的复合效应及界面区的再强化,钢纤维水泥基复合材料的疲劳次数可提高一个数量级或疲劳强度提高两倍以上。
钢纤维,, 高强水泥基体,, 界面消失与再强化,, 疲劳特性
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孙伟, SUN WEI AND YAN YUN
SCIENCE IN CHINA (Series A) May 1992 Vol. 35 No.5,-0001,():
-1年11月30日
In this paper, the flexural, split tensile, impact and fatigue performance of steel tiber reinforced silica fume high-strength concrete (SIFUMHSC) under static and dynamic loads are studied. The effect of the amount of silica fume on its performance, the strengthening effects of siilca fume partieIe and steel fiber and their composite effect are discussed. Test results indicate to a full extent that different amounts of silica fume substituting for cement can remarkably improve the static and dynamic mechanicaI behaviour of steel fiberr einforced SIFUMHSC with other conditions unchanged and that the main realon for the change is that the addition of silica fume brings about a double interracial strengthening effect of fiber. cement matrix and aggregate-cement matrix, thus improving the structure and characteristics of the interface. When the addition of silica fume is adequate, the Hv-d, Ia-d and CHAS-d urves tend to be horizontal, wish dlfferences disappearing between the interiacla| foyer and matrix, so that the size and number of crack sources in the interracial zones and the whole matrix become smaller and less, and strengthening effects are better developed. This is the key to the desired performance of steel fiber reinforced SIFUMHSC.
areal fiber,, ailiea fume,, fatigue strength,, high-strength concrete,, interfacial layer.,
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孙伟, wei Sun, Huisu Chen*, Xin Luo, Hongpin Qian
Cement and Concrete Research 31(2001)595-601,-0001,():
-1年11月30日
In this paper, thgh-performmance concrete (HPC) ihcorporated with expansive agent and hybrid fiber, i.e., steel fiber, polyvinyl alcohol fber (PVA fiber), and polypropy[ene fiber (PP tiber), was produced. The properties measured included shrinkage and water permeation of the concrete The effect of hybrid fibers and/or expansive agent on the shrinkage and water permeation properties was investigated. Test results indicated that the hybrid fiber of different types and sizes could reduce the size and amount of crack source at different scales; hybrid fibers combthed with expansive agent provided better enhancement for shrinkage resistance and impeccability of HPC than monoincorpomnon of hybrid fibers or expansive agent; the improvemem of the shrinkage resistance and the impermeability of tbe concrete resulted from the combined use of expansive agent and hybrid flbers, which was dependent on the amount of expansive agent, types and sizes of hybrid fibers, total volume fraction of fibers, proportions of hybrid fibers, and so on. The relevant mecbanisms were also discussed based on the analysis of the test results of pore structure of the concrete.
Hybrid fiber High-performance concrete, Shrinkage, Permeability
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孙伟, Xin Luo a, *, Wei Sun a, Sammy Yin Nin Chan b
Cement and Concrete Research 30(2000)379-383,-0001,():
-1年11月30日
A research program was carried out to investigate the residual compressive strength of high-porformance concrete (HPC) and normal strength concrete (NSC) after they were exposed to high temperatures, 8O0℃ and 1100℃, and two cooling regimes, Test results obtained showed that eompared with the strength at room temperature, the residual strength of both HPC and NSC dropped sharply after exposure to high temperatures. Water cooling, which resulted in a significant thermal shock. caused a bit more severn deterioration in strength compared to furnace cooling. Thermal shock was not necessarily the primary cause for spalling in HPC. Mereury intrusion porosimetry tests were carried out to measure variation in the pore structure of concrete. Sigaifieant changes in the cumulative pore volume curves before and after high lemperatures in both NSC and HPC were observed. The cumulative pore votume of HPC increased more remarkably than thai of NSC. The difference between the effects of the two cooling regimes on mechanical property as well as the microstmeture decreased at 1100℃ when compared 800℃.
High-performance concrete, High tempemture, Compressive strength, Microstructure
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【期刊论文】In situ monitoring of the hydration process of K-PS geopolymer cement with ESEM
孙伟, Wei Sun*, Yun-sheng Zhang, Wei Lin, Zhi-yong Liu
Cement and Concrete Research 34(2004)935-940,-0001,():
-1年11月30日
Environmeneal scanning electron mieroscope (ESEM) was used to in sire quantitatively studu the hydration process of K-PS geopolymer cement under an 80% RH cnvironment. An energy disperion X-rap analysis (EDXA) was also employed to distinguish the chemical composition of hydration product. The ESEM micrographs showed that metakaolin particles pack loosely at 10min after mixing. resulting in the existence of many large voids. As hydration proceeds, a lot of gels were seen and gradually precipitated on the surfaces of these panicles. At teter stage, these particles were whipped by thick gel layers abd their interpaces were almost completely lifted. The corresponding EDXA resufts illustrated that the molar ratios of K/Al increase while Si/Al decrease with the development of hydration. As a result, the molar ratios of K/Al and Si/Al of hydration products at an age of 4h amounted to 0.99 and 1.49. respectivelp, which were close to the theoretical values (K/Al=1.0 Si/Al=1.0 for K-PS geopolymer cement paste). In addition, well-developcd crysthis could not been found at any ages; instead, sporgclike amorphous gels were always been observed.
K-PS geopolymer cemeny, Hydration process, ESEM, In situ quanitatively study
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【期刊论文】Study of the Fatigue Performance and Damage Mechanism of Steel Fiber Reinforced Concrete
孙伟, by Sun Wei, Gao Jianming, and Yan Yun
ACI Materials Journal/May-June 1996,-0001,():
-1年11月30日
In this paper, the effects of the volume fraction of steel fiber. amount of silica fume, and their composite on fatigue perfomance and the mechanism of fatigue damage are investigated. The fatigue equations of steel fiber reinforced concrete and reinforced high-strength concrete are presented. Test results shaw that the effect of volume fraction and length diameter ratio on fatigue performance of concrete is extremely prominent. When silica fume, steel fiber, and their composite are added to high-strength concrete, since the effecss of the two of the nucleation and pozzolanic reaction of silica fume are in the cement marrix, and the effects of steel fiber on the strengthening toughening, and crack arresting in the composite, the interfacial structure of both the fiber cement matrix and aggregate cement matrix is strengthened. The soace superimposing of the effects of the two of the fiber-cement matrix and aggregate-cement matrix appear in the fiber reinforced composite. The double effect af interfacial strengthening and space superimposing of the fiber-cement matrix and aggregate-cement matrix is prodaeed and the inrerfacial structure and character are improved, the process of strengthening. vanishing, and restrengthening of the interface Is caused, and she dimension and the amount of crack sources are reduced. thus delaying crack extension and propagation and the protess of fatigue damage. evidently protonging fatigue life.
damage, fatigue (, materials), , fatigue tests, fiber reinforced concretes, silica fume
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