Computers and Concrete

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The research on static and dynamic mechanical properties of concrete under the environment of sulfate ion and chlorine ion

  • Nie, Liangxue (Department of Airfield and Building Engineering, Air Force Engineering University) ;
  • Xu, Jinyu (Department of Airfield and Building Engineering, Air Force Engineering University) ;
  • Bai, Erlei (Department of Airfield and Building Engineering, Air Force Engineering University)
  • Received : 2015.04.19
  • Accepted : 2017.04.16
  • Published : 2017.08.25
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Abstract

The Hydraulically driven test system and ${\Phi}100mm$ split Hopkinson pressure bar(SHPB) test device were employed to research the quasi-static and dynamic mechanical properties of concrete specimens which has been immersed for 60 days in sodium sulfate (group S1) and sodium chloride (group S2) solution, the evolution of their mass during corrosive period was explored at the same time, and the mechanism of performances lost was analyzed from the microscopic level by using scanning electron microscope. Results of the experimental indicated that: their law of mass both presents the trend of continuous rising during corrosive period, and it increases rapidly on the early days, the mass growth of group S1 and group S2 in first 7 days are 76.78% and 82.82% of their total increment respectively; during the corrosive period, the quasi-static compressive strength of specimens in two groups are significantly decreased, both of which present the trend of increase first and then decrease, the maximum growth rate of group S1 and group S2 are 7.52% and 12.71% respectively, but they are only 76.23% and 82.84% of specimens which under normal environment (group N) on day 60; after immersed for 60 days, there were different decrease to dynamic compressive strength and specific energy absorption, and so as their strain rate sensitivities. So the high salinity environment has a significant effect of weaken the quasi-static and dynamic mechanical performance of concrete.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Air Force Engineering University

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