The Deflection Behavior of High Temperature ExposedReinforced Concrete Beam
Journal Title: International Journal of engineering Research and Applications - Year 2018, Vol 8, Issue 2
Abstract
The high temperature exposure that induces the concrete’s microstructure changes, will eventually cause the changes of physical and mechanical nature of the concrete’s structure while also change the behavior of the reinforced concrete beam. This research studied the deflection behavior of the reinforced concrete beam that had been burned in high temperature and the correlation of this act towards the changes in the concrete’s microstructure and the maximum deflection of post-burn reinforced concrete beam. The study used 28 days old of 36 reinforced concrete beams (150 mm x 200 mm x 750 mm) with 25 mm thick concrete cover that had been burned under various temperatures (400oC ; 600oC ; 800oC), compared with unburned control. Afterwards, the flexibility test was done towards the reinforced concrete beams to identify the level of deflection and maximum deflection of each beam.The recent evaluation microstructure test showed that the physical and mechanical characters are in equal with the behavior of post burn reinforced concrete beam .The test result showed that high temperature exposure will change the deflection behavior of reinforced concrete beam. The concrete beam exposed by 400oC temperature, in general, have less deflection value. This result was supported by the examination data of the concrete’s microstructure that showed positive result. On the other hand, 600oC exposure led to the destruction of the concrete’s microstructure that reduce the concrete’s strength and increase the beam’s deflection. In 800oC exposure, the microstructure examination showed the lost of portlandite phase, the cement’s characteristic nature, thus drastically reducing the strength of concrete’s materials. Similarly, the steel’s strength was also reduced, leading to further reducement of reinforced concrete’s beam strength.
Authors and Affiliations
Setyowati E W, Soehardjono A
Keywords
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- EP ID EP393732
- DOI 10.9790/9622-0802031318.
- Views 107
- Downloads 0
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