U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000


Skip to content U.S. Department of Transportation/Federal Highway AdministrationU.S. Department of Transportation/Federal Highway Administration

Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

Report
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-07-039
Date: July 2007
<< Previous ContentsNext >>

Appendix A - Corrosion Resistant Alloys for Reinforced Concrete

APPENDIX A

EXAMPLE PH CALCULATION

From equation 3.1,

Definition of pH in terms of activity coefficient and concentration (molality) of hydroxide ions. The p H equals 14 plus the logarithm of the product of the activity coefficient for hydroxide times the hydroxide ion molality.
(3.1)

where gammaOH is the activity coefficient for OH‾, which was taken as 0.7, and [OH‾] is molality of that species. Thus, assuming [OH-] = 0.1,

pH = 14+log (0.7· 0.1) = 14+(· 1.15) = 12.85.

<< Previous Contents Next >>
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000
Turner-Fairbank Highway Research Center | 6300 Georgetown Pike | McLean, VA | 22101

All Federal Highway Administration (FHWA) information technology systems will be unavailable, Friday, December 2, at 10:00 p.m. to Sunday, December 04, at 11:59 p.m., EDT, while work is being performed on the network. During that time, users will not be able to access any FHWA systems.

If you have any questions or problems, please contact the 5-Help Service Center @ (866) 466-5221 or 5-HelpServiceCenter@dot.gov.