TYTRO® AE 270 admixture is an aqueous solution of a complex mixture of organic acid salts. TYTRO® AE 270 is specially formulated for use as an air-entraining admixture for shotcrete and is manufactured under rigid control which provides uniform, predictable performance. It is supplied ready-to-use and does not require premixing with water. One Litre weighs approximately 1.02kg ± 0.01kg.
TYTRO® AE 270 meets the requirements of the following specifications for chemical admixtures for concrete: ASTM C260; AS1478 and AASHTO M154.
TYTRO® AE 270 is used in shotcrete applications. Because TYTRO® AE 270 imparts workability to the mix, it is particularly effective with slag, lightweight, or manufactured aggregates which tend to produce harsh concrete. It also makes possible the use of natural sand deficient in fines.
Air is entrained by the development of a semi-microscopic bubble system introduced into the mix by agitation and stabilised by TYTRO® AE 270.
Millions of tiny air bubbles entrained with TYTRO® AE 270 act as flexible ball bearings, lubricating and plasticising the shotcrete mix. This permits a reduction in mixing water with no loss in slump. Placeability is improved, and bleeding and segregation are minimised.
TYTRO® AE 270 shotcrete is extremely durable, particularly when subjected to freezing and thawing. It has resistance to frost and deicing salts, as well as to sulfate, sea and alkaline waters.
There is no standard addition rate for TYTRO® AE 270. The amount to be used will depend upon the amount of air required under job conditions, usually in the range of 3 to 6%. Typical factors which might influence the amount of air-entrained are: temperature, cement, sand gradation, and use of extra fine materials such as fly ash. Typical TYTRO® AE 270 addition rates range from 20 to 100mL / m3 of cementitious material. Higher addition rates can be used for various projects. Addition rates as high as 300 to 500mL / m3 of cementitious material can be considered.
The air-entraining efficiency of TYTRO® AE 270 becomes even greater when used with water-reducing and set-retarding agents. This may allow a reduction of up to two-thirds in the amount of TYTRO® AE 270 required for the specified air content.
It is GCP’s recommendation that trials are conducted to determine the optimum addition range for your application.
Entrained air will increase the volume of the concrete making it necessary to adjust the mix proportions to maintain the cement factor and yield. This may be accomplished by a reduction in water requirement and aggregate content.
Please contact your local GCP representative for further information regarding the dispensing equipment for this product.
See TYTRO® AE 270 Material Safety Data Sheet or consult GCP Applied Technologies.
TYTRO® AE 270 is compatible in shotcrete with TYTRO® accelerating admixtures, water-reducing admixtures and water-reducing retarders. By combining the separate effects of air entrainment with the dispersion of a water-reducing admixture, the water requirement of shotcrete may be reduced with proportional increases in strength and improvement in durability. Each admixture should be added separately to the mix.
TYTRO® AE 270 is available in bulk, and 205L drums. TYTRO® AE 270 contains no flammable ingredients. It freezes at about -1°C, but its air-entraining properties are completely restored by thawing and thorough agitation.
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.
TYTRO 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.
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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: 2022-11-24
https://gcpat.uk/en-gb/solutions/products/tytro-shotcrete-system/tytro-ae-270