DARACEM® 19CF-HSR

Product Description

DARACEM® 19CF-HSR is a high performance liquid concrete superplasticiser that has been developed to impart extreme workability to concrete mixes so that large or difficult pours can be made, whilst maintaining excellent slump retention properties, especially under hot climatical conditions. This product has minimal set retardation characteristics. DARACEM® 19CF-HSR can also be utilized to affect large water reductions, thus achieving high performance in both plastic and hardened states. DARACEM® 19CF-HSR is an extremely powerful deflocculating agent and performs by dispersing cement into its primary particles, dramatically increasing flow characteristics of the cement paste.

Advantages

• High compressive strength concrete especially at early ages.
• High workability concrete mix with DARACEM® 19CF-HSR will have the same or higher compressive strength compared to plain concrete of similar w/c ratio.
• Plastic concrete exhibits high cohesion, fluidity andflowability.
• Excellent slump retention properties even at highambient temperatures, whilst exhibiting minimalset retardation.
• Addition of DARACEM® 19CF-HSR to plain concrete allows a water reduction of up to 30%.
• Low water/cement ratios lead to excellent durability of concrete.
• Good surface finish, providing highly aesthetic concrete appearance.

Main applicational areas are:

• High quality concrete for durable structures
• Bridge deck slabs
• Silica Fume concrete
• Pozzolanic and blast furnace slag concretes
• Reinforced and pre-stressed precast elements
• Piling & In-situ structures

DARACEM® 19CF-HSR meets the requirements of ASTM C494 Type D and G, BS EN 934-2 and ASTM C1017.

Typical Properties

Method Of Use

DARACEM® 19CF-HSR is supplied ready for use and should be added to concrete mixes either during the mixing cycle or at the same time as the water. Alternatively it should be added in its supplied form to a normal concrete mix a few minutes before the pour is made. In the latter case a mixing cycle of at least 2 minutes should be provided to ensure complete dispersion. 

Compatibility with Cements

DARACEM® 19CF-HSR is compatible with all Portland, Pozzolanic and Blast furnace cements. It is also compatible with concrete containing fly ash and/or silica fume.

Compatibility with other Admixtures

DARACEM® 19CF-HSR should not be premixed under any circumstances with other admixtures. While some admixtures can be usefully combined within the same mix, the performance of this product may well be affected by the presence of other chemicals. We recommend that GCP be contacted for advice in all such circumstances.

Addition Rates

Range: 0.60% - 2.0% volume by weight of cement

The optimum dosage is assessed after preliminary trials depending
upon the actual mix constituents and specifications required. For special concrete this range may reach 2.5% volume by weight of cement.

Addition rates outside of the recommended dosage range may be used for special concrete applications. In such circumstances it is important to conduct preliminary trials on the actual mix constituents
to assess the effect on the properties of the concrete at the dosage level specified.

Effects of Overdosing

Serious overdosing of DARACEM® 19CF-HSR will generally produce a concrete mix of even greater workability. Set retardation and a slight increase in air entrainment may be noticed. In SRC mixes and in cooler weather, set retardation will be further increased. If intentionalor accidental increases above the recommended addition rates are encountered, care must be taken to allow for the effect on the stripping time of formwork. In such cases, however, provided the concrete is properly cured, the ultimate strength will generally be higher than for normal concrete.

Health and Safety

For further information see the DARACEM® 19CF-HSR SDS (Safety Data Sheet) or consult GCP Applied Technologies.

Packaging

DARACEM® 19CF-HSR is supplied in 210 Litre, non returnable containers. Alternatively, 1000 Litre IBCs and bulk deliveries can be arranged.

Storage

DARACEM® 19CF-HSR should be stored in original containers or suitable closed tanks, preferably out of direct sunlight and protected from extremes of temperature.

Storage Life in Manufacturer’s Drums:

12 months from date of manufacture

Storage Life in Bulk Storage:

12 months from date of delivery

Technical Service

The Technical Service Department of GCP Applied Technologies is available to assist you in the correct and best use of our products. These resources and advice are at your disposal entirely without obligation.