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R4 Dry Sprayed Fibre Reinforced Micro Repair Concrete

PRODUCT DESCRIPTION Tasir® -Gunite02 is a cement based, fast setting,polymer modified one component repair mor- tar containing silica fume and high range water-redu- cing agents, meeting the requirements of Class R4 of BS EN 1504-3. Formulated for machine applications us- ing the dry process......

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PRODUCT DESCRIPTION

Tasir® -Gunite02 is a cement based, fast setting,polymer modified one component repair mor- tar containing silica fume and high range water-redu- cing agents, meeting the requirements of Class R4 of BS EN 1504-3. Formulated for machine applications us- ing the dry process without set accelerators, repairs may be profiled and trowel finished where necessary.


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USES

▪ Large volume repairs

▪ Bridges

▪ Marine structures

▪ Tunnels

▪ Facades

▪ For exterior and interior use

▪ In place of R1, R2 & R3 mortars

 

CHARACTERISTICS / ADVANTAGES

▪ 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 re- inforcement

▪ Rapid strength gain without set accelerators

▪ Very low shrinkage

▪ Can be finished to a good standard

▪ Fibre Technology reduces shrinkage cracking and im- proves toughness

▪ Fast setting properties & fibres reduces the effect of tidal wash out in coastal or rising water situations


APPROVALS / STANDARDS

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


PRODUCT INFORMATION

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TECHNICAL INFORMATION

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SYSTEM INFORMATION

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APPLICATION INFORMATION

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SUBSTRATE QUALITY / PRE-TREATMENT

Concrete:

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.


MIXING

Tasir® -Gunite02 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.


APPLICATION

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 Sika 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 minimum and max- imum 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® -Gunite02 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.

Fibres will be exposed on the final finish. For a smooth fibre free surface use Tasir® -Gunite01 as final layer (see separate Product Data Sheet).

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.


CURING TREATMENT

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 adversely affect subsequently applied products and systems.

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


CLEANING OF TOOLS

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


LIMITATIONS

▪ 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.

▪ 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 byad- justing water and air pressure and number of passes to achieve thickness build up relevant to the repair size.


VALUE BASE

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.


LOCAL RESTRICTIONS

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.

 

ECOLOGY, HEALTH AND SAFETY

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.


LEGAL NOTES

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.


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