ASTM C1556 parameters calculator (uisng Langmuir binding isotherm)

Calculate ASTM C1556 parameters (i.e., apparent diffusion coefficient, surface chloride concentration, and bound chloride concentration, given the formation factor of concrete, and Langmuir isotherm properties.

Self diffusion coefficient of Cl in water at 25oC (m/s2):


Porosity of concrete:


Langmuir binding isotherm parameter, alpha:


Langmuir binding isotherm parameter, beta:


Chloride concentration of the exposure solution (kg/m3 of solution):


Formation factor of concrete:


Density of concrete (kg/m3):
(If known)



Bound chloride concentration (kg/m3 of concrete):


Apparent chloride diffusion coefficient (m/s2):


Surface chloride concentration (kg/m3 of concrete):


Surface chloride concentration (% mass of concrete):
(Based on the provided concrete density)