MIRA® 35 is a mid-range water reducer specifically formulated to produce concrete with enhanced finishing characteristics and near-neutral set times.
MIRA® 35 is an aqueous solution of complex organic compounds, each of which contributes uniquely to the concrete’s final properties. It is manufactured under rigid control, which provide uniform predictable performance. MIRA® 35 does not contain calcium chloride as a functional ingredient. It is supplied as a brown colored, low viscosity liquid. One gallon weighs 10.5 lbs (one liter weighs approximately 1.26 kg).
MIRA® 35 offers significant advantages over conventional water reducers. Laboratory and field work has consistently demonstrated:
MIRA® 35 is recommended for residential and commercial flatwork and formed concrete surfaces including ready-mix, job site, precast and concrete paving plants for normal and lightweight concrete. MIRA 35 imparts a “slickness” to the surface of the concrete, which is highly desirable for slip formed placement.
MIRA® 35 is also highly effective to improve paste quality in lean, harsh mixes and concrete containing fly ash and GGBF slag. MIRA® 35 produces concrete with improved placement properties including improved pumpability. It yields a less permeable concrete that is more resistant to damage from freeze-thaw exposure.
The typical addition rate range of MIRA 35 is 3 to 12 fl oz/100 lbs (195 to 780 mL/100 kg) of cementitious material. Addition rates may vary depending on materials, job conditions and desired performance characteristics. Please consult your GCP Applied Technologies representative for information and assistance.
MIRA 35 is compatible with most GCP admixtures as long as they are added separately to the concrete mix, usually through the water holding tank discharge line. In general, it is recommended that MIRA 35 be added to the concrete mix near the end of the batch sequence for optimum performance. Different sequencing may be used if local testing shows better performance. Please see GCP Technical Bulletin TB-0110, Admixture Dispenser Discharge Line Location and Sequencing for Concrete Batching Operations for further recommendations. MIRA 35 should not come in contact with any other admixture before or during the batching process, even if diluted in mix water.
Pretesting of the concrete mix should be performed before use, as conditions and materials change in order to assure compatibility, and to optimize dosage rates, addition times in the batch sequencing and concrete performance. For concrete that requires air entrainment, the use of an ASTM C260 air-entraining agent (such as DARAVAIR® or DAREX® product lines) is recommended to provide suitable air void parameters for freeze-thaw resistance. Due to a synergistic effect between MIRA 35 and air-entraining agents, the amount of air-entraining agent may be reduced by 10% to 50% when added to concrete that contains MIRA 35. Please consult your GCP Applied Technologies representative for guidance.
MIRA 35 is available in bulk, delivered in metered tank trucks, or in totes and drums.
MIRA 35 will freeze at approximately 25°F (-5°C), but will return to full strength after thawing and thorough mechanical agitation.
A complete line of accurate, automatic dispensing equipment is available. MIRA 35 may be added to the concrete mix on the sand or in the batch water.
Concrete shall be designed in accordance with Standard Recommended Practice for Selecting Proportions for Concrete, ACI 211.
This water-reducing admixture shall be a mid-range water reducing admixture such as MIRA 35 as manufactured by GCP Applied Technologies. The admixtures shall not contain calcium chloride. It shall meet the requirements of Specification for Chemical Admixtures for Concrete, ASTM C494 as a Type A admixture. Certification of compliance shall be made available upon request. The admixture shall be delivered as a ready to use liquid product and shall not require mixing at the batching plant or at the job site.
| Control - US Units | MIRA® 35 - US Units | |
|---|---|---|
| Cement (pcy) | 517 | 517 |
| Coarse aggregate (pcy) | 1878 | 1840 |
| Fine aggregate (pcy) | 1415 | 1278 |
| Water (pcy) | 252 | 239 |
| w/cm | 0.487 | 0.462 |
| Slump (inches) | 3.5 | 3.5 |
| Plastic air (%) | 5.8 | 5.6 |
| Compressive strength | ||
| 1 day (psi) | 2860 | 3180 |
| 7 day (psi) | 4280 | 4840 |
| 28 day (psi) | 5300 | 5860 |
| Initial set time (hr:min) | 4:39 | 4:58 |
| Length change 28 day (%) | -0.037 | -0.038 |
| Freeze-thaw resistance (RDME %) | 93 | 89 |
| Control - Metric | MIRA® 35 - Metric | |
|---|---|---|
| Cement (kg/m3) | 307 | 307 |
| Coarse aggregate (kg/m3) | 1114 | 1092 |
| Fine aggregate (kg/m3) | 840 | 758 |
| Water (kg/m3) | 425 | 403 |
| w/cm | 0.455 | 0.462 |
| Slump (mm) | 89 | 89 |
| Plastic air (%) | 5.8 | 5.6 |
| Compressive strength | ||
| 1 day (MPa) | 19.7 | 21.9 |
| 7 day (MPa) | 29.5 | 33.4 |
| 28 day (MPa) | 36.5 | 40.4 |
| Initial set time (hr:min) | 4:39 | 4:58 |
| Length change 28 day (%) | -0.037 | -0.038 |
| Freeze-thaw resistance (RDME %) | 93 | 89 |
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 and DAREX 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 2018 GCP Applied Technologies Inc. All rights reserved.
GCP Applied Technologies Inc., 2325 Lakeview Parkway, Suite 475, Alpharetta, GA 30009, USA
GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6.
This document is only current as of the last updated date stated below and is valid only for use in the Canada. 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.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: 2024-06-21
https://ca.gcpat.com/fr-ca/solutions/products/mira-mid-range-water-reducers/mira-35