R4 Dry Sprayed Micro Repair Concrete

PRODUCT DESCRIPTION Tasir® -Gunite01 is a cement based, polymer modified one component repair mortar containing silica fume and high range water-reducing agents, meeting the requirements of Class R4 of BS EN 1504-3. Formulated for ma- chine applications using the dry process without set......

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Tasir® -Gunite01 is a cement based, polymer modified one component repair mortar containing silica fume and high range water-reducing agents, meeting the requirements of Class R4 of BS EN 1504-3. Formulated for ma- chine applications using the dry process without set accelerators, repairs may be profiled and trowel finished where necessary.



▪ Large volume repairs

▪ Bridges

▪ Marine structures

▪ Tunnels

▪ Facades

▪ For exterior and interior use

▪ In place of R1, R2 & R3 mortars



▪ One component, ready to use micro concrete

▪ Non silica aggregates

▪ Low rebound losses and dust formation during the spraying process

▪ Layer thicknesses in one application overhead up to 150mm are possible without any additional mesh reinforcement

▪ Rapid strength gain without set accelerators

▪ Very low shrinkage

▪ Can be finished to a high standard

▪ Overcoatable with Tasir reprofiling/levelling mortars and coatings


▪ Approved for potable water contact

▪ Resistivity: Mott MacDonald Report No. 37423/DA/001.Rev A

▪ Conforms to the requirements of BS EN 1504-3 R4 Classification









The concrete shall be thoroughly clean, free from dust, loose material, surface contamination and materials which reduce bond or prevent suction or wetting by repair materials. De-laminated, weak, damaged and deteriorated concrete and where necessary sound concrete shall be removed by suitable mechanical or very high pressure waterblasting techniques.

Tying wire fragments, nails and other metal debris em- bedded in the concrete should be removed where pos- sible.

The edges where concrete is removed should be cut at a minimum angle of 90o to avoid undercutting and a maximum angle of 135o to reduce the possibility of de- bonding with the top surface of the adjacent sound concrete and should be roughened sufficiently to provide a mechanical key between the original materi-al and Tasir® Repair material.

Ensure sufficient concrete is removed from around the full circumference of the reinforcement to allow ap- plication of the reinforcement corrosion protection coating (If required) and compaction of the repair ma- terial.

Steel Reinforcement:

Rust, scale, mortar, concrete, dust and other loose and deleterious material which reduces bond or contrib- utes to corrosion shall be removed. Surfaces shall be prepared using abrasive blast cleaning or high pres- sure water-blasting techniques to a minimum stand- ard of SA 2 (ISO 8501-1) If these types of techniques are not permissble contact Tasir® Ltd for alternative op- tions using hand preparation techniques and Galvanic Anodes.

Where exposed reinforcement is contaminated with chloride or other material which may cause corrosion, the reinforcement shall be cleaned by low pressure waterblasting.

Reference shall be made to EN1504-10 for specific re-quirements.


Tasir® -Gunite01 is fed into the dry process spraying machine which should be of suitable size for the repair areas to reduce wastage and rebound. The amount of water added is controlled by the nozzle- man at the nozzle and should be sufficient to prevent slump and dust. Rebound will be increased with un- suitably sized spraying machine, compressor, nozzle type, dry mixture and thin layers.


Reinforcement Corrosion Protection:

Where a reinforcement coating is required the applica- tion of the repair mortar shall be applied when the the reinforcement coating has cured (Minm finger nail hard). Refer to the System Information above for com- patible Tasir products and refer to the relevant Product Data Sheet for more detailed information about the reinforce- ment corrosion product.

The sprayed repair mortar shall be placed onto the pre-wetted substrate between the nminimum and maximum layer thicknesses without the formation of voids and loose rebound material. Where layers are to be built up to prevent sagging or slumping, each layer should be allowed to stiffen before applying sub- sequent layers “wet on wet”. When layers cannot be applied “wet on wet”, pre-wet surface and allow to surface dry to a dark matt appearance.

Tasir® -Gunite01 is finished by leaving ‘as shot’ or striking off with a straight edge and closing the sur- face with a wooden/plastic float or damp sponge to achieve the desired surface texture.

Reference shall be made to BS EN1504-10:2003 for specific requirements, the Code of Practice for sprayed concrete issued by the Concrete Society and any other guidelines that are specific to the structure.


It is essential to cure the repair mortar immediately after application for a minimum of 3 days to ensure full cement hydration and to minimise cracking. Use polythene sheeting taped down at the edges or other approved method.

Curing compounds shall not be used when they ad- versely affect subsequently applied products and sys- tems.

Reference shall also be made to BS EN1504-10:2003 for specific requirements.


Clean all tools and application equipment with water immediately after use. Hardened/cured material can only be mechanically removed.


▪ Refer to recommendations provided in BS EN 1504- 10.

▪ Avoid application in direct sun and/or strong wind and/or rain.

▪ Do not add water over recommended dosage.

▪ Apply only to sound, prepared substrates.

▪ Do not add additional water during the surface finish- ing as this will cause discoloration and cracking.

▪ Protect freshly applied material from freezing.

▪ Do not over work final finish as this can cause sur- face cracking

▪ Rebound, slump and overhead layer thickness will be affected by the w/c ratio, type of spraying equip- ment, presence of reinforcement and air pressure used to convey material to the nozzle. A balance should be achieved to optimise material usage by ad- justing water and air pressure and number of passes to achieve thickness build up relevant to the repair size.


All technical data stated in this Product Data Sheet are based on laboratory tests. Actual measured data may vary due to circumstances beyond our control.


Please note that as a result of specific local regula- tions the performance of this product may vary from country to country. Please consult the local Product Data Sheet for the exact description of the application fields.


For information and advice on the safe handling, stor- age and disposal of chemical products, users shall refer to the most recent Material Safety Data Sheet contain- ing physical, ecological, toxicological and other safety- related data.



The information, and, in particular, the recommendations relating to the application and end-use of TASIR products, are given in good faith based on TASIR's current knowledge and experience of the products when properly stored, handled and applied under normal conditions in accordance with TASIR's recommendations. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. The user of the product must test the product's suitability for the intended application and purpose. TASIR reserves the right to change the properties of its products. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sale and delivery. Users must always refer to the most recent issue of the local Product Data Sheet for the product concerned, copies of which will be supplied on request.

Tasir Construction Material&Technology Corporate Headquarters

Tianda Block, Jianggan District, Hangzhou City, Zhejiang Province, China

Tel: +86-571-28119206 

Fax: +86-571-28197878

Specifications Subject to Change.

For most current version of datasheet, go to

© 2018Tasir Construction Material&TechnologyCp.,Ltd | 08-21-2018 Rev. H | China Owned & Operated

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