Engineering Mechanics

Proceedings Vol. 22 (2016)

ENGINEERING MECHANICS 2016

Copyright © 2016 Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague

 

Hlaváček P., Němeček J.
pages 213 - 216, full text

Accelerated chloride migration tests are performed on cylindrical samples made of Portland cement concrete. Low voltage electric field is applied as a driving force for both chloride accelerated penetration and extraction. It is verified that the chloride concentration profile measured in samples after 48 hours of electromigration approximately corresponds to the chloride profile after six months of natural diffusion. Potential and effectiveness of the chloride extraction process for the rehabilitation of concrete in terms of lowering the chloride concentration using the DC current is discussed. Experiments show up to 50% decrease in chloride concentration in concrete after 48 hours of extraction driven by electric field with the reverse polarity. Simulation of the process is provided using analytical and numerical solutions of partial differential equations with a simplification in form of the constant diffusion coefficient.

Text and facts may be copied and used freely, but credit should be given to these Proceedings.

All papers were reviewed by members of the scientific committee.