MIGRATION EXPERIMENT. Functional Sample Migration Experiment
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1 Functional Sample Migration Experiment MILENA PAVLÍKOVÁ, LUKÁŠ FIALA, ZBYŠEK PAVLÍK Department of Materials Engineering and Chemistry Faculty of Civil Engineering Czech Technical University in Prague
2 Functional Sample Migration Experiment II Measuring apparatus consists of plastic container divided into two parts. In the middle of the container, there is the plastic barrier with the hole where the sample isolated by silicone gel is fixed. Thickness of the sample is typically 10 mm, width and height 50x50 mm. Into the compartments, 2.5 litres of distilled water and 2.5 litres of 0.65M NaCl solution are poured. After that, the electrodes are placed into the both compartments. For the sake of homogenous field need, electrodes are plane shaped having dimensions 50x50 mm and made of bronze. Cathode is placed into the solution of NaCl and anode into the distilled water. The distance of electrodes from the central barrier is 20 mm. Electrodes are connected to the source of direct electric voltage of 4V. Experiment is carried out at constant laboratory temperature 22±1 C. Evaluation of migration test During a migration test, assuming that the upstream side of the material sample is very quickly saturated with salt ions, we can neglect the diffusion term since there is no concentration gradient at x = 0. Then the flux of chlorides through the upstream side is constant and can be described by equation J F = De upcupe where E is intensity of electric field [V/m], RT up, Jup chloride ion flux through the upstream side of the sample [mol/m 2 /s] and cup is average concentration in the upstream cell [mol/m 3 ].
3 NONSTAT Functional Sample Migration Experiment III M. Pavlíková 1*, Z. Pavlík The 2* chloride ion flux Jup is determined after the achievement of *Czech Technical University the steady in Prague, state salt Faculty transport of Civil according Engineering, to the equation Department of Materials Engineering and Chemistry, Czech Republic J up = c up 1V c St up2 V milena.pavlikova@fsv.cvut.cz, pavlikz@fsv.cvut.cz where cup1 is concentration at time t1 [mol/m 3 ], cup2 concentration at time t2 [mol/m 3 ], V volume of salt solution in the upstream cell The functional sample NONSTAT is instrumental to the [m 3 ], S sample surface exposed to the salt solution [m 2 ], t= t1-t2 experimental assessment of hygrothermal function of building time interval [s] corresponding to the salt flux Jup. From this materials and fragments of building structures in the conditions equation, effective diffusion coefficient can be expressed, and for close to the reality. The studied specimens are within the measured input data calculated. experimental testing exposed to the difference climate that corresponds to the real climatic loading of building structures. The functional sample NONSTAT consists of two climatic chambers and connecting tunnel that is placed between the chambers and serves for the samples placing. Usually, 1-D analysis of hygrothermal behaviour is performed. However, also the 2-D and 3-D experiments are possible. Within the climatic loading, moisture content, relative humidity, temperature and salinity are monitored in the studied specimen. For that purpose, sophisticated
4 Functional Sample Migration Experiment IV Figure 1. Arrangement of climatic chamber system and Figure 1. Scheme of the migration test. mechanical space of climatic chamber.
5 Functional Sample Migration Experiment V Figure 2. View of the migration experiment migration cell arrangement.
6 Functional Sample Migration Experiment VI Figure 3. Source of direct current connected to the electrodes.
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