TB-0903 — General Properties and Benefits of DCI® S Corrosion Inhibitor Technical Bulletin

/ concrete / mix design


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® 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


gcpat.com | North America Customer Service: 1 877-4AD-MIX1 (1 877-423-6491)

We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

DCI, ADVA, DARATARD and DARAVAIR are trademarks, which may be registered in the United States and/or other countries, of GCP Applied Technologies Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

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GCP Applied Technologies Inc., 2325 Lakeview Parkway, Suite 450, Alpharetta, GA 30009, USA
GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6
This document is only current as of the last updated date stated below and is valid only for use in the United States. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.com. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2022-05-16