limits may be set on chlorides, sulfates, alkalies, and solids in the 

 mixing water. A water source comparable in analysis to any of the waters 

 in Table 5 is probably satisfactory for use in concrete. 



Table 5. Chemical limits for mixing water. 



Chemicals 



Maximum 

 concentration, 1 

 (ppm) 



Test 

 method 2 



Chloride, as CL 



Prestressed concrete or concrete in 

 bridge decks 



500 3 



ASTM Std. 

 D512 



Other reinforced concrete in moist 

 environments or containing aluminum 

 embedments or dissimilar metals or 

 with stay-in-place galvanized metal 

 forms 



1 OOO 3 





Sulfate, as SO 4 



3 000 



ASTM Std. 

 D516 



Alkalies, as (Na 2 + 0.658 K 2 0) 



600 





Total solids 



50 000 



AASHTO T26 

 (Sec. 3.1) 



iWash water reused as mixing water in concrete can exceed the listed con- 

 centrations of chloride and sulfate if it can be shown that the concentra- 

 tion calculated in the total mixing water, including mixing water on the 

 aggregates and other sources, does not exceed the stated limits. 



2 0ther test methods that have been demonstrated to yield comparable results 

 can be used. 



3 For conditions allowing use of CaCl2 accelerator as an admixture, the 

 chloride limitation may be waived by the purchaser. 



Water containing less than 2 000 parts per million of total dissolved 

 solids can generally be used satisfactorily for making concrete. Water 

 containing more than 2 000 parts per million of dissolved solids should be 

 tested for its effect on strength and time of set. Water containing 2 000 

 to 3 000 parts per million, not including Na2S0i,, of dissolved solids is 

 acceptable if free of organic matter. American Concrete Institute (ACI) 

 Committee 201 (1977), limits chloride ions to percentages of weight according 

 to types of concrete (Table 6) . 



Water for use in prestressed work should be more definitely restricted 

 in salt, silt, and organic contents. It should contain 



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