Publications

PRO112

GAS PERMEABILITY AND ELECTRICAL RESISTIVITY OF STRUCTURAL CONCRETES: IMPACT OF PORE SATURATION



Author(s):Qiang Gui, Minfeng Qin, Kefei Li
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016
Segment on
Moisture in Materials and Structures
Editor(s): Kurt Kielsgaard Hansen, Carsten Rode and Lars-Olof Nilsson
Print-ISBN: 978-2-35158-230-5
ISBN: 978-2-35158-178-0
e-ISBN : 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 44-53
Total Pages: 10
Language : English


Abstract: The long-term durability of concrete structures is closely related to the physical properties
including the gas permeability and electrical resistivity, and the pore saturation is a
determinant factor on the gas permeability and electrical resistivity of structural concretes.
This paper reports the recent experimental investigation on the gas permeability and electrical
resistivity at different pore saturations for several representative structural concretes. Concrete
specimens with different pore saturations were prepared through oven-drying and moisture
equilibrium procedure. The gas permeability was measured through CemBureau method and
the Klinkenberg effect was considered in the regression of apparent gas permeability; the
electrical resistivity was measured through alternative current method with the minimum
electrical current set as 40mA. From the results, it is found (1) a percolation threshold of pore
saturation exits for gas permeability and electrical resistivity reflecting the pore gas/liquid
depercolation; (2) the impact of pore saturation on the gas permeability and electrical
resistivity can be well described through the Van Genuchten-Mualem (VGM) model, and
rather consistent exponent coefficients are regressed for relative gas permeability and relative
electrical conductivity.


Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00