scope:

This test method describes procedures to measure the chloride threshold concentration to initiate active corrosion of reinforcing bars in concrete using a macrocell slab type specimen.

Test measurement of chloride threshold concentration can be used to project service life of various reinforced concrete structural members when placed in corrosive environments.

The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of R 18 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with R 18 alone does not completely assure reliable results. Reliable results depend on many factors; following the suggestions of R 18 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.