现场运行近50年水工混凝土性能的试验研究
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摘要
试验研究了龄期近50年混凝土的材料性能。混凝土的抗压强度增长趋势符合对数曲线的关系;劈拉强度与抗压强度存在良好的内在关系,且泊松比的数值与普通混凝土的基本一致;过水水工混凝土的碳化层强度要低于未碳化混凝土的强度,这与碳化混凝土的孔径、总孔隙率及最可几孔径变大,孔结构状况变差有关;长龄期未碳化混凝土的抗渗能力与混凝土的设计强度比较匹配,并没有随着强度的增长而提高,孔结构压汞测试及电镜观察结果揭示了其中的原因。
Material characteristics of approximate fifty years concrete have been tested in this research.The results indicate that increasing of compressive strength of long age concrete accords with logarithm curve,splitting tensile strength and compressive strength have good internal relationship,and Poisson's ratio value corresponds with common concrete.It is also discovered that carbonated zone strength is lower than uncarbonated zone strength for the water-carrying hydraulic concrete,which results from the enlargement of pore diameter,total pore volume and most probable pore size of carbonated zone of the concrete,and the deterioration of pore structure.The impermeability of the long-age uncarbonated concrete almost accords with design strength of the concrete,and does not elevate with the increasing of concrete strength,which is revealed by mercury intrusion pores method(MIP) and scanning electron microscope(SEM).
Material characteristics of approximate fifty years concrete have been tested in this research.The results indicate that increasing of compressive strength of long age concrete accords with logarithm curve,splitting tensile strength and compressive strength have good internal relationship,and Poisson's ratio value corresponds with common concrete.It is also discovered that carbonated zone strength is lower than uncarbonated zone strength for the water-carrying hydraulic concrete,which results from the enlargement of pore diameter,total pore volume and most probable pore size of carbonated zone of the concrete,and the deterioration of pore structure.The impermeability of the long-age uncarbonated concrete almost accords with design strength of the concrete,and does not elevate with the increasing of concrete strength,which is revealed by mercury intrusion pores method(MIP) and scanning electron microscope(SEM).
引文
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[7]YasuoKosaka,Takashi Miura,Yukihiro Tsukada.Solt-damage andretrofitting of prestressed concrete bridges at Japenese sea coast inNorth-Japen[J].Proceedings of 8thInternational Conference StructuralFaults repair,1999,(9):43-45.
[8]Castro P,Sanjuan MA,Genesca J.Carbonation of concretes in Mexicangulf[J].building and Environments,2000,35:145-149.
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[14]吴中伟,廉慧珍.高性能混凝土[M].北京:中国铁道出版社,1999.
[2]周新刚.混凝土结构的耐久性与损伤防治[M].北京:中国建材工业出版社,1999.
[3]MehtaPK.Durability-criticalissuesforthefuture[J].Concreteinternational,1997,(7):27-33.
[4]金伟良,赵羽习.混凝土结构耐久性[M].北京:科学出版社,2002.
[5]Matta ZG.Deterioration of concrete structures in the Arabian gulf[J].Concrete international,1993,(7):33-36.
[6]Rasheeduzzafar,Dakhil FH,and Gahtani AS.Corrosion of Reinforcementin Concrete Structures in the Middle East[J].Concrete International,1985,(9):48-55.
[7]YasuoKosaka,Takashi Miura,Yukihiro Tsukada.Solt-damage andretrofitting of prestressed concrete bridges at Japenese sea coast inNorth-Japen[J].Proceedings of 8thInternational Conference StructuralFaults repair,1999,(9):43-45.
[8]Castro P,Sanjuan MA,Genesca J.Carbonation of concretes in Mexicangulf[J].building and Environments,2000,35:145-149.
[9]江见鲸.混凝土结构工程学[M].北京:科学出版社,1999:1-9.
[10]Etman EE,Helmy MA.Assessment of the behavior of strengthened con-crete structural elements[C].First International Conference on civil En-gineering(1).Cairo Egypt:International Association of Testing and Re-search Laboratories for Material Structures,1998:534-542.
[11]邸小坛,周燕.旧建筑物的检测加固与维护[M].北京:地震出版社,1991.
[12]袁群,李宗坤,李杉,等.圆柱体横向劈拉测定混凝土抗拉强度方法的研究[J].工业建筑,2006,36(6):83-87.
[13]过镇海.混凝土的强度和变形试验基础的本构关系[M].北京:清华大学出版社,1997.
[14]吴中伟,廉慧珍.高性能混凝土[M].北京:中国铁道出版社,1999.
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