Degradation of permeability resistance of high
strength concrete after combustion
- LI Min1, QIAN Chunxiang1, KAO Hongtao2
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1.Department of Materials Science and Engineering, Southeast University; 2.Nanjing University of Technology
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History
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| Published |
| 05 Sep 2008 |
| Issue Date |
| 05 Sep 2008 |
To evaluate the remaining durability of concrete materials after combustion, the permeability of high strength concrete (HSC) after combustion was studied. The transport behavior of chloride ion, water and air in concrete after combustion and the effect of temperature, strength grade, and aggregation on the permeability of HSC after combustion are investigated by chloride ion permeability coefficient (Dc), water permeability coefficient (Dw) and air permeability coefficient (Da). The experiment results show that all three permeability coefficients commendably reflect changes of permeability. The permeability coefficient increases with the evaluation temperature. After the same temperature, the permeability coefficient of HSC is lower than that of normal strength concrete (NSC). However, the degree of degradation of permeability coefficient of HSC is greater than that of NSC. The permeability resistance of HSC containing limestone is better than that of HSC containing basalt. Combining changes of compressive strength and permeability, the remaining durability of concrete materials after combustion is appropriately evaluated.
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