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Publication Number: FHWA-HRT-13-028
Date: October 2013

 

Guidelines for Sampling, Assessing, and Restoring Defective Grout in Prestressed Concrete Bridge Post-Tensioning Ducts

Dear Customer:
Editorial corrections were made to this report after it was originally published. The following table shows the modifications that were made to this report.

Location

Incorrect Values

Corrected Values

Table 32 on page 90

CD3         0.08 < Cl0.20b

CD3         0.2 < Cl ≤ 0.50b

Table 33 on page 91

CD3         0.02 < Cl ≤ 0.50

CD3         0.2 < Cl ≤ 0.50

 


Table 32. CD classifications as determined by grout Cl levels from an option 1 inspection and resultant recommended actions.

CDa

CD1 Cl ≤ 0.08 X      
CD2 0.08 < Cl ≤ 0.20   X    
CD3 0.08 < Cl ≤ 0.20b
0.2 < Cl ≤ 0.50b
    X  
CD4 Cl > 0.50b       X
Action Grade
1 5 7 9
A1 None      
A2 Expand sampling      X
A3 Reinspect in 5 years      
A4 Reinspect in 2 years     X X
A5 Tendon monitoring     X X
a Chloride concentration units are wt percent cement.
b If strand corrosion or fracture(s) are found (PD5 or PD6 under option 2 in table 33 ), then
grade 9 or 10 should be assigned as appropriate per option 2 actions.

 


Table 33. CD and PD classifications as determined by grout Cl levels and in-place grout structure by an option 2 inspection and resultant recommended actions.

CDa
CD1 Cl ≤ 0.08 X X X X            
CD2 0.08 < Cl ≤ 0.20         X X        
CD3 0.02 < Cl ≤ 0.50
0.2 < Cl ≤ 0.50
            X X    
CD4 Cl > 0.50                 X X
PD
PD0 Sound grout X                  
PD1 Grout air pocket   X X X X X X X X X
PD2 Exposed strand/tendon     X X X X X X X X
PD3 Soft or segregated grout       X X X X X X X
PD4 Tendon surface corrosion (no section loss)           X X X X X
PD5 Tendon surface corrosion (< 5 percent section loss)               X X X
PD6 Tendon with partial or full fracture (≥ 5 percent section loss)                   X
Action Grade
1 2 3 4 5 6 7 8 9 10
A1 None X X                
A2 Expand sampling             X X X X
A3 Reinspect in 5 years       X X X        
A4 Reinspect in 2 years             X X X X
A5 Tendon monitoring             X X X X
A6 Consider repairing deficiency as necessaryb   X X X X X X X X X
A7 Structural evaluation/load rating                   X
A8 Tendon replacement                   X
a Chloride concentration units are wt percent cement.
b This applies to PD1, PD2, and PD3.

 

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