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

Chryso®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. Chryso®DCI^® S is a non-accelerating version of Chryso®DCI S Corrosion Inhibitor. Chryso®DCI S contains a set control component that compensates for the accelerating effect of Chryso®DCI. The result is:

Corrosion protection identical to Chryso®DCI^®

• Set time performance similar to untreated concrete
• Chryso®DCI concrete with improved slump life
• Chryso®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, Chryso®DCI S is equivalent to Chryso®DCI on a unit to unit basis. If a project specification requires 20 L/m3 (4.0 gal/yd3) of Chryso®DCI Corrosion Inhibitor, 20 L/m3 (4.0 gal/yd3) of Chryso®DCI^® S may be substituted.

Mix designs for Chryso®DCI^® S concrete should be handled as described in the technical bulletin, “Proportioning Chryso®DCI^® (and Chryso®DCI^® S) Concrete Mixes” (TB-0900), with one exception — little correction has to be made for acceleration. Because Chryso®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 Chryso®DCI^® S only compensates for the accelerating effect of the Chryso®DCI^®. When weather conditions warrant the use of a retarder in normal concrete, it should be included with a Chryso®DCI^® S mix. As with Chryso®DCI^®, trial mixes with the project’s concrete materials must be performed with Chryso®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)

Comparable Concrete Mix Designs

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

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