Virtual Rapid Chloride Permeability Test

The purpose of this form is to estimate the results of a rapid chloride permeability test (ASTM C1202) for a concrete mixture. For a user-specified concrete mixture, an estimate of the concrete's formation factor is obtained from an equation developed previously. The equation was developed with data for water-to-cement ratios ranging from 0.3 to 0.5, silica fume additions of 0 % to 10 % by mass, and aggregate volume fractions of 0.62 to 0.70. Given the formation factor and an estimate of the pore solution conductivity, the computation of the total charge passed during a rapid chloride permeability test is relatively straightforward. Please note that for the virtual test method, the reported result is for the concrete specimen of a user-specified size and is not adjusted to the nominal 3.75" diameter specimen as in the C 1202 standard test method.

The user can change the mixture proportions or test conditions and the total charge passed, along with the effective w/c ratio, estimated degree of hydration of the binder, estimated final temperature, and concrete density will be calculated. The Compute button can be used to perform this calculation for the default parameters. If the user wishes to override the estimated degree of hydration, they can change that value and use the Recompute button to update the total charge passed value. Also, the estimated final temperature can be manually copied to the final temperature in the test conditions box and the results recalculated in an iterative fashion (at the user's discretion).

pdf version of manuscript

Download site for Excel version of pore solution conductivity calculator

Mixture Proportions

Material Mass (kg) SiO2 content (%) Specific Gravity Fineness (m2/kg)
Water Not applicable Not applicable
Silica Fume Not applicable
Fly Ash Not applicable
Slag Not applicable Not applicable
Limestone filler Not applicable Not applicable
Fine Aggregate Not applicable Not applicable
Coarse Aggregate Not applicable Not applicable
Hardened Concrete Air Content (%): Estimated pore solution conductivity (S/m): Help available

Test Conditions

Applied Voltage (V): Time (min): Specimen length (mm):

Specimen diameter (mm): Initial Temperature (oC): Final Temperature (oC):

Curing/Saturation: Saturated Sealed

Predicted Total Charge Passed (Coulombs):

Predicted Initial Current (mA):

Predicted Initial Resistance (Ohms):

Estimated Effective Water to Cement Ratio:

Predicted Degree of Hydration at 28 d (%): (user may change)


Estimated Final Temperature (oC):

Estimated Concrete Density (kg/m3):

Estimated Yield for Mixture Proportions Above (m3):

Questions or comments:


Software disclaimer

This software was developed at the National Institute of Standards and Technology by employees of the Federal Government in the course of their official duties. Pursuant to title 17 Section 105 of the United States Code this software is not subject to copyright protection and is in the public domain. This software is an experimental system. NIST assumes no responsibility whatsoever for its use by other parties, and makes no guarantees, expressed or implied, about its quality, reliability, or any other characteristic. We would appreciate acknowledgement if the software is used.

This software can be redistributed and/or modified freely provided that any derivative works bear some notice that they are derived from it, and any modified versions bear some notice that they have been modified.