Volume 39 Issue 10
Oct.  2013
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Geng Jiao, Diao Bo, Chen Shengganget al. Degradation mechanism of air-entrained concrete under alternative actions of freeze-thaw cycles and seawater immersion[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(10): 1392-1396. (in Chinese)
Citation: Geng Jiao, Diao Bo, Chen Shengganget al. Degradation mechanism of air-entrained concrete under alternative actions of freeze-thaw cycles and seawater immersion[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(10): 1392-1396. (in Chinese)

Degradation mechanism of air-entrained concrete under alternative actions of freeze-thaw cycles and seawater immersion

  • Received Date: 05 Dec 2012
  • Publish Date: 30 Oct 2013
  • Experiments had been done on air-entrained concrete test cubes(air content is 5.9%) experienced alternative actions of freeze-thaw cycles in the seawater to explore the properties deterioration mechanism via testing the compressive strength, the relative dynamic elastic modulus and the mass loss. Then, observing the microstructure of the concrete by scanning electron microscope (SEM). The SEM observation shows that there was barely cracks and crystals in the normally cured concrete, but cracks emerged and gradually developed as the times of freeze-thaw cycle increased. The main cracks developed further and crystals emerged in the concrete experienced 300 cycles. The results show that the alternative actions of freeze-thaw cycles and seawater immersion give rise to the emergence and development of the cracks, chemical reactions produce some dilatability crystals. Both of the physical changes and the chemical reactions make the compressive strength decrease by 8.5%, but have no apparent influence on the relative dynamic elastic modulus and the mass loss.

     

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