MIRA® SR 31 is a high performance water reducer designed for use in a wide range of concrete applications and as well as a plasticising effect will also provide extended slump retention properties and is particularly beneficial for long or difficult pours.
It can be used at a range of dosage levels to reduce water content, increase compressive strength and/or the consistence class of concrete mixes.
MIRA® SR 31 is manufactured under controlled conditions to give a consistent product. Depending on addition rate, MIRA® SR 31 conforms to EN 934-2.
| MIRA® SR 31 | ||
| Appearance | Dark Brown Liquid | |
| Specific Gravity (20°C) | 1.14 | |
| Alkali Content (eq.Na20) | 2.20% | |
| Chloride Content | Nil | |
| Air Entrainment | 1.0 % | |
| Freezing Point | 0°C | |
MIRA® SR 31 is supplied ready for use. When producing consistence concrete it should be added in its supplied form with part of the batching water after the addition of the cement component.
After the addition of MIRA® SR 31, a further mixing cycle of a least two minutes is recommended to enable MIRA® SR 31 to efficiently disperse the mix components.
With Cements :
MIRA® SR 31 can be used with most types of Portland cements. It is also effective in concrete containing fly ash or ground granulated blastfurnace slag. For use with special cements we recommend that you consult GCP Applied Technologies.
With Other Admixtures:
MIRA® SR 31 is fully compatible with all GCP admixtures normally used in concrete production.
Each admixture must be added separately. Individually added, each will deliver exactly the results desired.
However, the performance of the material may be affected by the presence of other chemicals and we would recommend that GCP be consulted in such circumstances.
| Range | 400 ml -800 ml per 100 kg cement |
| 0.40% -0.80% (v/w) by wt. of cement | |
| As a guide to trials an addition rate of 0.50% volume by weight of cement is suggested. | |
| For advice and assistance with trials we recommend that you consult GCP Applied Technologies. | |
MIRA® SR 31 is a versatile, high performance product that benefits from a wide variety of applications. As with most products of this type, level of effectiveness is governed by the quantity of product used and the specific nature of the concrete mix and constituent materials.
The performance of MIRA® SR 31 is best assessed after preliminary tests to determine the optimum dosage and effect on both plastic and hardened concrete, such as cohesiveness, consistence retention, and setting, rate of early strength gain, ultimate strength and shrinkage.
As dosage is increased throughout the recommended range, concrete consistence and retardation of set also increases. These effects will be more pronounced when using cement replacements and in cold weather. In mixes containing fly ash or ggbs, or indeed where concrete setting times are crucial such as flooring applications, a reduced dosage rate may be appropriate.
Accidental overdosing particularly in cold weather; will be accompanied by retardation of set of the concrete. Providing overdosed concrete is properly cured, the ultimate strength will generally be higher than that of a normal concrete.
Planned overdosing outside the recommended range should be further discussed with the Technical Service department of GCP.
Any situation where an overdose is suspected, careful inspection of the concrete in its plastic state should be conducted. Particular attention to consistency and cohesiveness prior to a decision on the suitability of the concrete for the particular application in question.
It is preferable that the MIRA® SR 31 should be introduced into the mixer by automatic dispensing equipment. Equipment or advice on dispensing can be obtained from GCP.
For further information on Health and Safety matters regarding this product we recommend that you consult the relevant Material Safety Data Sheet from GCP. In line with general chemical handling precautions avoid contact with skin or eyes and protective gloves/goggles should be worn.
MIRA® SR 31 is supplied in both 15 and 205 non returnable drums and 1,000 litre totes. Alternatively, bulk deliveries can be arranged.
MIRA SR 31 should be stored away from the extremes of temperature and then protected from frost. If the product does freeze, it should be thawed and carefully re-mixed before use. The product should be kept out of direct sunlight in shaded storage at all times.
Storage Life in Manufacturer ‘s Drums :
12 months from date of manufacture.
Storage Life in Bulk Storage:
12 months from date of delivery.
Our Technical Service department of GCP Applied Technologies is available to assist you in the correct use of our performance chemicals.
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 is a trademark, 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 2020 GCP Applied Technologies Inc. All rights reserved.
GCP Applied Technologies (UK) Ltd, Gate St, Dukinfield SK16 4RU.
This document is only current as of the last updated date stated below and is valid only for use in the United Kingdom. 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.uk. 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: 2025-05-13
https://gcpat.uk/en-gb/solutions/products/mira-sr-31