MIRA® 299S

Mid-range water-reducing admixture

Product Description

MIRA® 299S is a mid-range water reducer specifically formulated to produce concretes with enhanced finishing characteristics and controlled set time. It is a ready-to-use liquid admixture with superior dispersing capacity for the cement particles in the concrete mix. This capability exceeds that of normal water-reducing admixtures, resulting in better control. MIRA 299S contains no added chloride. One litre weighs approximately 1.24kg ± 0.02kg.

MIRA 299S is formulated to comply with the following chemical admixture specifications for concrete: ASTM C494, Type D, Type G; BS 5075: Part 1.


Excellent slump control and slump retention are necessary properties of any high quality concrete. MIRA 299S is a tailor-made admixture that helps concrete to achieve excellent slump retention for all ranges of design workability. MIRA 299S is extremely effective in enhancing workability and slump retention even in mid-slump concrete and concrete with manufactured sand (crush granite fines), where conventional admixtures have difficulties achieving these properties.

MIRA 299S can help to optimise total concrete cost in the readymix concrete business. MIRA 299S enables use of alternative materials, for instance, higher percentage use of fly ash may be possible. MIRA 299S works well with both Portland Cement and Portland Composite Cement. MIRA 299S can be used to produce a highslump concrete, at the same water-to-binder ratio.

MIRA 299S is suitable for a wide range of quality concrete, from low to higher grade concrete, by adjusting addition rate. The use of Daracem® or Darex® superplasticiser can help to provide further water reduction when very low water-cement ratio is needed.

Product Advantages

  • MIRA 299S is robust to variation in harmful clay content in manufactured sand or quarry dust, and help accommodate variation in quality of manufactured sand to give consistent quality of concrete.
  • Provides long slump life with controlled set times.
  • 8 to 20% water reduction and dispersion characteristics allow the production of lower water to cement ratio concretes and more complete hydration.
  • Finishes easily without stickiness, tearing or spotty set characteristics, which results in quick and easy application to the concrete mix water for rapid batching.

Compatibility with Other Admixtures

Most water reducers or water-reducing retarders are compatible with MIRA 299S as long as they are added separately to the concrete. MIRA 299S is not compatible with polycarboxylatebased admixtures.

Addition Rates

Addition rates of MIRA 299S can vary with type of application. Depending on the application, dosage rates can range from 300 to 1,000mL / 100kg of cementitious material. At a given watercement ratio, the slump required for placement can be controlled by varying the addition rate. It is recommended that trials are conducted beforehand to determine the optimum dose range to suit your application. If further assistance is required please consult your local GCP representative.

Dispensing Equipment

Please contact your local GCP representative for further information regarding the dispensing equipment for this product.

Packaging and Storage

MIRA 299S is available in bulk and in 205L drums. MIRA 299S contains no flammable ingredients. For proper dispensing, MIRA 299S should be stored under shelter and away from direct sunlight.

Health and Safety

See MIRA 299S Material Safety Data Sheet or consult GCP Applied Technologies.

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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.

MIRA, Darex and Daracem 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.

© Copyright 2017 GCP Applied Technologies, Inc. All rights reserved.

GCP Applied Technologies Inc., 2325 Lakeview Parkway, Alpharetta, GA 30009, USA
GCP Applied Technologies Holdings (Thailand) Limited., 848 Moo 2, Bangpoo Industrial Estate (North), Phraksa Mai, Muang Samutprakarn, Samutprakarn 10280, Thailand
This document is only current as of the last updated date stated below and is valid only for use in Thailand. 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.th.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: 2023-07-07