The microstructure of ITZ (Interfacial Transition Zone) in single glass fibre-cement was investigated by SEM (Scanning Electron Microscope), EPXM (Electron Probe X-ray Microanalyzer) and ESEM (Environmental Scanning Electron Microscope). The surface morphology of glass fibres and the hydration products in the vicinity of the interfaces were observed.Chemical element (Zr, Ca and Si) distributions over the ITZ thickness were determined by line-scanning with EPXM.The results show that a low-density transition zone existed in the vicinity of glass fibres. The shape of the fibre-cement ITZ was non-symmetrical and its thickness was variable. In the present study, the width of the zone ranged from 1-5μm.Locally, it came to 10μm.Occasionally, some hydration products with high alkalinity were embedded inside the ITZ, and attached on the glass surface,making the ITZ denser and causing local glass to corrode.The test results are helpful for the further understanding of the GRC degradation.
参考文献
| [1] | Scrivener K L;Pratt P L .[R].RILEM Report 11-Interfacial Transition Zone in Concrete,1996. |
| [2] | Jaras A;Litherland K.Microstructure Features in Glass Fibre Reinforced Cement Composites.Proc. of RILEM Symps[M].Fibre Reinforced Cement & Concrete,1975:327. |
| [3] | Kumar A;Roy D.Microstructure of Glass Fibre/Cement Paste Interface in Admixture Blend Portland Cement Paste[C].Proc. PCI Symp. Durability of Glass Fibre Reinforced Concrete,1985:157. |
| [4] | Savastano H;Agopyan V;Dantas F.Fibre-Cement Paste Transition Zone: Characterization and Effect on the Mechanical Properties[C].Interfaces in Cementitious Composites-Proceedings of the International Conference Held by RILEM,1992:22-23. |
| [5] | Sun W Mandel J;Said S .Study on the Interface Strength in Steel Fibre Reinforced Cement-based Composites[J].Journal of the American Concrete Institute,1986,83:597-605. |
| [6] | Bentur A;Wu S.Fibre-matrix Interfaces[A].,1995:149191. |
| [7] | Stroeven P;Stroeven M.Aspects of a Computer-Simulation Approach to the Design of High Strength Concrete[A].,1997:79-92. |
| [8] | Bentur A .Role of Interfaces in Controlling Durability of Fibre-reinforced Cement[J].Journal of Materials in Civil Engineering,2000,30:747-753. |
| [9] | Purnell P;Short N R;Page C L;Majumdar A J .Microstructure Observation in New Matrix Glass Fibre Reinforced Cement[J].Cement and Concrete Research,2000,30:747-753. |
| [10] | Bentur A;Odler I.Development and Nature of Interfacial Microstructure[M].RILEM Report 11-Interfacial Transition Zone in Concrete,1996:18. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%