Compatibility with Other Admixtures and Batch Sequencing
DARACEM® 19 is compatible with most GCP admixtures as long as they are added separately to the concrete mix, usually through the water holding tank discharge line. However, DARACEM® 19 is not recommended for use in concrete containing polycarboxylatebased ADVA® superplasticizers or MIRA® mid-range water reducers. In general, it is recommended that DARACEM® 19 be added to the concrete mix near the end of the batch sequence for optimum performance. Different sequencing may be used if local testing shows better performance. Please see GCP Technical Bulletin TB-0110, Admixture Dispenser Discharge Line Location and Sequencing for Concrete Batching Operations for further recommendations.
Pretesting of the concrete mix should be performed before use, and as conditions and materials change in order to assure compatibility, and to optimise dosage rates, addition times in the batch sequencing and concrete performance. For concrete that requires air entrainment, the use of an ASTM C260 air-entraining agent (such as DARAVAIR® or DAREX® II AEA) is recommended to provide suitable air void parameters for freeze-thaw resistance. DAREX® AEA is not recommended. Please consult your GCP Applied Technologies representative for guidance.
Packaging & Handling
DARACEM® 19 is available in bulk, delivered by metered tank trucks, in totes and drums. DARACEM® 19 will begin to freeze at approximately 32 °F (0 °C), but will return to full strength after thawing and thorough agitation. In storage, and for proper dispensing, DARACEM® 19 should be maintained at temperatures above 32 °F (0 °C).
Dispensing Equipment
A complete line of accurate, automatic dispensing equipment is available.