What is chloride diffusion coefficient?
What is chloride diffusion coefficient?
The chloride diffusion coefficient is an indication of the capacity of any type of concrete to resist chloride penetration and is used to predict the service life of reinforced concrete structures.
What is diffusion coefficient of sodium chloride in water?
The diffusion coefficient of Na+ and Cl- ions in water, extracted from relevant data in Table 2, are found to be 1.33 x 10-5 cm2/s and 2.03 x 10-5 cm2/s respectively.
What is the diffusion coefficient of water?
Solution: The molecular diffusion coefficient of water vapor in air for the specified temperature and pressure is given in Appendix A. 3, and is 24.9 × 10 – 6 m 2 s − 1 .
What is the diffusion rate of chlorine?
The rates of diffusion of an unknown gas and chlorine are in the ratio of 6:5.
What is chloride ion diffusion in concrete?
The chloride binding in concrete affects the rate of chloride ingress, which in turn determines the chloride-induced corrosion initiation. The pore solution concentration, which is the driving agent of chloride diffusion process, is reduced due to the chloride binding reducing the chloride transport process [18.
What is the diffusion coefficient for sodium?
A λ of 2.11 for sodium means an apparent tissue diffusion coefficient of 23% of the free-diffusion coefficient, which is similar to the values found by Johnson (18) and Harris and Burn (17) from the fast component of the sodium washout curve from skeletal muscle.
How do you find the diffusion coefficient?
Diffusion coefficient is the proportionality factor D in Fick’s law (see Diffusion) by which the mass of a substance dM diffusing in time dt through the surface dF normal to the diffusion direction is proportional to the concentration gradient grad c of this substance: dM = −D grad c dF dt.
What is the value of diffusion coefficient?
A typical diffusion coefficient for a molecule in the gas phase is in the range of 10-6 to 10-5 m2/s. By contrast, diffusion for molecules dissolved in liquids is far slower. In an aqueous (water) solution, typical diffusion coefficients are in the range of 10-10 to 10-9 m2/s.
How do you calculate diffusion rate?
Diffusion Rate Calculator
- Formula. R2 = R1 / [Sqrt(M2/M1)]
- Diffusion Rate of Gas 1.
- Molar Mass of Gas 1.
- Molar Mass of Gas 2.
What is the rate of diffusion formula?
Let at constant temperature and pressure, the rate of diffusion or effusion of the gas molecules = r and density = d. According to Graham’s law, r = k/√d, where k is a gas constant.
What is critical chloride threshold?
The chloride threshold, also often referred to as the critical chloride content, is the concentration of chloride in concrete required to break down the passive layer (i.e., depassivate) of the reinforcement that may lead to corrosion initiation.
