APPENDIX D 



GUIDANCE FOR SELECTING TYPES OF CONCRETE MIXES FOR SPECIAL ENVIRONMENTS 



6-14 Corrosion Protection for Concrete 

 .1 Preliminary Report 



The minimum cover for reinforcing steel in concrete structures and the type of cement to be used is 

 dependent upon the environment. The Districts will normally investigate the bridge sites for chloride and 

 sulfate content of the soU. The prehminary report writer will obtain the site corrosion data from the 

 District materials report and include it in the preliminary report. 

 .2 Chloride Protection 



The minimum covering measured from the surface of the concrete to the face of any reinforcing bar 

 shall be as shown in Table A under normal environment. For those structures subject to marine or high 

 chloride environment the covering to the face of the bar shall be increased to the values listed under the 

 appropriate heading. 



Table A 



Minimum Co 



vering for Reinforcing Steel' ' 





Environment 



Structure Member 



Normal 

 (inch) 



Marine^^^ 

 (inch) 



High Chlorides 

 (above 1000 ppm) 



Piles 



2 



3(3) 



See 

 Table B 



Footings 



3 



4 



Walls 



2 



4 



Outside face of Box Girder Webs 



1 



3 



I and T Beam Webs 



1 



3 



Bottom Flange Bulb of I or T Beam 



VA 



3 



Curbs and Railings 



1 



2 



Exposed slab 

 Riding surface 

 Bottom surface 



1^,(4) 



1 - 1/2 



2 



1/2 



Columns 

 Flat face 

 Comer 



2 

 2 



4 

 5 



Caps 

 Flat face 

 Comer 



2 

 2 



4 

 5 



(1) A protective coating shall be appUed to steam cured members in a marine 

 environment. 



(2) A marine environment is defined as in or within about 1,000 feet of the ocean or 

 tidal water. Concrete shall contain a minimum of seven sacks of cement per cubic 

 yard. 



(3) A protective coating shall be applied to that portion of pile which will remain 

 above the ground or water line. Limits of protective coating shall be shown on the 

 plans. 



(4) 2 in freeze-thaw environments. 



339 



