Technical Bulletin

General Properties and Benefits of DCI® S Corrosion Inhibitor – TB-0903

14 June 17

DCI® S Corrosion Inhibitor is formulated for situations where accelerated concrete set times are not required or desired. Such applications may include warm or hot weather cast-in-place construction and prestress concrete. DCI® S is a non-accelerating version of DCI® S Corrosion Inhibitor. DCI® S contains a set control component that compensates for the accelerating effect of DCI®. The result is:

Corrosion protection identical to DCI®

  • Set time performance similar to untreated concrete
  • DCI® concrete with improved slump life
  • DCI® S will not be exactly neutral setting for all cements at all weather and project conditions. Preconstruction testing is required.

Corrosion Protection

For corrosion protection, DCI® S is equivalent to DCI® on a unit to unit basis. If a project specification requires 20 L/m3 (4.0 gal/yd3) of DCI Corrosion Inhibitor, 20 L/m3 (4.0 gal/yd3) of DCI® S may be substituted.

Mix designs for DCI® S concrete should be handled as described in the technical bulletin, “Proportioning DCI® (and DCI® S) Concrete Mixes” (TB-0900), with one exception — little correction has to be made for acceleration. Because DCI® S is essentially a neutral set admixture, offsetting acceleration with a retarder may not be necessary. It is important to remember, however, that the set control component of DCI® S only compensates for the accelerating effect of the DCI®. When weather conditions warrant the use of a retarder in normal concrete, it should be included with a DCI® S mix. As with DCI®, trial mixes with the project’s concrete materials must be performed with DCI® S several weeks before the project start-up in order to adjust the mix to obtain the desired air content, set time and slump.

Example 1: Concrete Temperature 21°C (70°F); Ambient Temperature 21°C (70°F)

Materials DCI® Mix DCI® S Mix
Cement, kg/m3 (lbs/yd3) 390 (658) 390 (658)
Water, kg/m3 (lbs/yd3) 156 (263) 156 (263)
DCI®/DCI® S, L/m3 (gal/yd3) 19.8 (4.0) 19.8 (4.0)
ADVA® , mL/100 kg (oz/100 lbs) 261 (4.0) 261 (4.0)
DARATARD® 17, mL/100 kg (oz/100 lbs) 261 (4.0) 0 to 130 (0 to 2.0)
DARAVAIR®, mL/100 kg (oz/100 lbs) as needed as needed

 

Comparable Concrete Mix Designs

The following two examples show DCI® mix designs altered for DCI® S. Note that the water content includes the 0.86 kg/L (7.0 lbs/gal) of water contributed by the DCI® or DCI® S.

Example 2: Concrete Temperature 32°C (90°F); Ambient Temperature 32°C (90°F)

Materials DCI® Mix DCI® S Mix
Cement, kg/m3 (lbs/yd3) 390 (658) 390 (658)
Water, kg/m3 (lbs/yd3) 156 (263) 156 (263)
DCI®/DCI® S, L/m3 (gals/yd3) 19.8 (4.0) 19.8 (4.0)
ADVA®, mL/100 kg (oz/100 lbs) 261 (4.0) 261 (4.0)
DARATARD® 17, mL/100 kg (oz/100 lbs) 391 to 522 (6.0 to 8.0) 261 to 326 (4.0 to 5.0)
DARAVAIR®, mL/100 kg (oz/100 lbs) as needed as needed

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