MIRA® 218N is a high performance, new generation mid-range water reducer based on comb polymer technology. 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 lower dosages and better control.
MIRA 218N contains no added chloride. One litre weighs approximately 1.05kg ± 0.02kg.
MIRA 218N produces concrete with extreme workability characteristics for middle slump, Grade 35 - Grade 50 concrete. It also allows concrete to be produced with low water-cement ratios at middle slump. MIRA 218N is ideal for use in 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.
In concrete containing MIRA 218N the use of an air-entraining agent (such as DARAVAIR® or DAREX® AEA®) is recommended to provide suitable air void parameters for resistance against freezethaw attack. Due to synergistic effects between MIRA 218N and air-entraining agents, the quantity of air-entraining admixture added to concrete containing MIRA 218N may be reduced. Please consult your local GCP representative for dosage guidance.
Most water reducers or water-reducing retarders are compatible with MIRA 218N as long as they are added separately to the concrete.
Caution should be exercised when using MIRA 218N with a retarder, as excessive retardation can occur if the admixture dosages are too high. Pre-testing of the concrete should be performed to optimise dosages and addition times of these admixtures. The admixtures should not be in contact with each other before they enter the concrete.
Please contact your local GCP representative for further information regarding the dispensing equipment for this product.
Addition rates of MIRA 218N can vary with type of application. Depending on the application, dosage rates can range from 400 to 1,800mL / 100kg of cementitious material. However, in most applications, 800 to 1,200mL / 100kg of cementitious material will be sufficient. For best results, MIRA 218N should be added with the mix water. 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 local GCP representative.
MIRA 218N is available in bulk and in 205L drums. MIRA 218N contains no flammable ingredients. It will begin to freeze at approximately 0°C, but will return to full strength after thawing and thorough agitation.
In storage, and for proper dispensing, MIRA 218N should be maintained at temperatures above 0°C. MIRA 218N should be stored under shelter and away from direct sunlight. Shelf life is six months from the date of delivery
See MIRA 218N 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.
MIRA, Daravair, Darex 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 (Hong Kong) Ltd., 6 On Chuen Street, On Lok Tsuen Ind Area, Fanling, Hong Kong
This document is only current as of the last updated date stated below and is valid only for use in Hong Kong. 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.hk. 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
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