WRDA® 60

Uses

WRDA® 60 produces concrete with lower water content (typically 8%–10% water reduction), improved workability and higher strengths. It is used in ready-mix block and concrete product plants.

Advantages

WRDA 60 offers significant advantages over single component water reducers. Water reduction and setting times are more consistent due to the polymer contents. WRDA 60 performs especially well in warm and hot weather climates to maintain slump and workability in high ambient temperatures.

The use of WRDA 60 produces a plastic concrete that is more workable, easier to place and more finishable than plain concrete. In the hardened state WRDA 60 concrete has higher compressive strengths at all ages than untreated concrete.

Finishability

WRDA 60 produces workable concrete with improved finishability and workability. The influence of WRDA 60 on lean mixes will be particularly noticeable. Floating and troweling, by machine or by hand, imparts a smooth, close surface tolerance.

Product Advantages

• Consistent water reduction and set times
• Improves performance concrete containing supplementary cementitious materials
• Produces concrete that is more workable, easy to place and finish
• High compressive and flexural strengths

Addition Rates

WRDA 60 provides water reduction and minimal retardation, through mild and extended retardation, as job site conditions require. As addition rates are increased, set times will be extended proportionately.

The addition rate of WRDA 60 is 3 to 10 fl oz/ 100 lbs (195 to 625 mL/100 kg) cementitious material. Pretesting is recommended to determine the optimum addition rate. Optimum addition rate is determined by other concrete mixture components, job site conditions and desired performance characteristics.

Compatibility with Other Admixtures and Batch Sequencing

WRDA 60 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. In general, it is recommended that WRDA 60 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.