DAREX® Super 20 is a high range water reducer based on naphthalene sulfonate. It is a low viscosity liquid which has been formulated by the manufacturer for use as received. Darex Super 20 contains no added chloride. Darex Super 20 is formulated to comply with the following chemical admixture specifications for concrete: ASTM C494, Type F; BS 5075: Part 3: 1985. One litre weighs approximately 1.20kg ± 0.02kg.
Darex Super 20 is a superior dispersing admixture having a marked capacity to disperse the cement agglomerates normally found in a cement-water suspension. The capability of Darex Super 20, in this respect, exceeds that of normal water-reducing admixtures.
Darex Super 20 produces concrete with extremely workable characteristics referred to as high slump, flowing concrete. Darex Super 20 also allows concrete to be produced with very low watercement ratios at low or normal slumps.
Darex Super 20 is ideal for use in prestress, precast, bridge deck or any concrete where it is desired to keep the water/cement ratio to a minimum and still achieve the degree of workability necessary to provide easy placement and consolidation. Darex Super 20 will also fluidise concrete making it ideal for tremie concreting or other applications where high slumps are desired.
In concrete containing Darex Super 20, the use of an air-entraining agent (such as DARAVAIR® or DAREX® AEA®) is recommended to provide suitable air void parameters for resistance against freeze-thaw attack.
Most water reducers or water-reducing retarders are compatible with Darex Super 20 as long as they are separately added to the concrete. Pretesting of the concrete should be performed to optimise dosages and addition times of these admixtures. Caution should be exercised when using Darex Super 20 together with a retarder, as excessive retardation can occur if the admixture dosages are too high.
Addition rates of Darex Super 20 can vary with type of application, but will normally range from 400 to 2,500mL / 100kg of cementitious material. In most instances the addition of 400 to 2,000mL / 100kg of cementitious material will be sufficient. At a given water-cement ratio, the slump required for placement can be controlled by varying the addition rate. Should job site conditions require using more than recommended addition rates, please consult your GCP Representative.
Please contact your local GCP representative for further information regarding the dispensing equipment for this product.
Darex Super 20 is available in bulk and in 205L drums. Darex Super 20 contains no flammable ingredients. It will begin to freeze at approximately 0°C, but will return to full strength after thawing and agitation. In storage and for proper dispensing, Darex Super 20 should be maintained at temperatures above 0°C.
See Darex Super 20 Material Safety Data Sheet or consult GCP APPLIED TECHNOLOGIES.
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.
Darex, Daravair and AEA 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, Alpharetta, GA 30009, USA
GCP (Singapore) Pte. Ltd, 25 Tanjong Penjuru, Singapore 609024.
This document is only current as of the last updated date stated below and is valid only for use in Singapore. 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.sg. 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: 2023-07-05
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