Preblended Polymer-Modified Cementitious Repair Mortar

Preblended, polymer-modified, cementitious repair mortar About this product Cement mortar is a general purpose high strength mortar for the repair of concrete, to both horizontal and vertical surfaces. This product has been formulated to comply with the requirements of BS EN 1504-3 as an R4......

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Preblended, polymer-modified, cementitious repair mortar



About this product

Cement mortar is a general purpose high strength mortar for the repair of concrete, to both horizontal and vertical surfaces. This product has been formulated to comply with the requirements of BS EN 1504-3 as an R4 mortar. It is used in conjunction with cement  keycoat primer.

Technical data



● General-purpose high-strength mortar

● Patch repairs to concrete floors and other horizontal surfaces

● Thin bonded vertical repairs to concrete, max 20 mm


Not suitable for soffit repairs.

Do not place when substrate temperature is below 5°C or when ambient temperature is below 5°C. Protect from frost.

Cement mortar has greater chemical resistance to mild acid attack than normal sand/cement mixes, but in situations liable to chemical spillage Technical resin-based systems are more suitable. Please contact our Technical Department for details.

Features and benefits

▲ Resistant to water penetration

▲ Good adhesion to concrete

▲ Faster strength development than ordinary sand-cement mortar

▲ Formulated to comply with the requirements of BS EN 1504-3 as an R4 mortar

▲ Resistant to foot and vehicular traffic



Concrete substrates must be adequately prepared either by use of a suitable mechanical method such as water blasting, needle gunning, or other appropriate means.

Old concrete surfaces contaminated  with oil or grease require suitable preparation, such as steam cleaning in conjunction with a suitable detergent. Care must be taken to ensure that the oil or grease is removed from the surface and not simply spread over a large area.

New concrete should be at least 14 days old.

Where repairs are carried out, feather edging is not recommended; therefore, the perimeter of area to be repaired should be cut back to provide a square edge, minimum 10 mm.

Before application of cement keycoat, the concrete should be thoroughly wetted but all surface water must be removed.


Steel reinforcement which has been exposed during preparation should be completely uncovered to the full circumference of the bar. Rust scale, corrosion products and other deposits shall be removed from reinforcement by grit blasting or other approved methods to achieve first quality to BS 7079-A1 (equivalent to Swedish Standard SA 21/2).

Steel cleaning shall include hidden faces  at the back of bars and at intersections, and the bonding agent/holding primer applied immediately after. In many instances where chloride-induced corrosion is absent, and where grit blasting is not practical, wire brushing or other techniques may be acceptable to the engineer, provided that care is taken not to polish the surfaces of the rust on the steel.

BS EN 1504-10 states: Where exposed reinforcement is contaminated with chloride or other material which may cause corrosion, the whole of the circumference of the contaminated reinforcement shall be cleaned by water jets not exceeding a pressure of 18 MPa to remove the chlorides and other contaminants unless electomechanical methods of protection and repair are to be used.

Cement keycoat bonding slurry Mix in the ratio of 3 volumes ofcement keycoat to 1 volume of clean water. Slowly add powder to water mixing continuously to a smooth creamy consistency.

Apply the slurry by a stiff brush and scrub well in. The slurry must be tacky when applying cement mortar.

In hot weather the slurry dries quickly and, therefore, it is advisable that cement  mortar is mixed ready for application before the bonding slurry is applied. lf cement keycoat does dry, it must be removed mechanically and a further coat applied.

In certain circumstances, especially in warmer conditions, it is more appropriate to use an epoxy primer such as technical  EP bonding aid.


Cement mortar must be mixed in a forced- action mixer such as a Mixal or Creteangle.

Slowly add the contents of a 25 kg bag of cement  mortar to 2•4 – 2.6 litres of clean water and mix for at least 3 minutes until a uniform colour and consistency is attained.


Apply the mortar to the tacky cement keycoat or technical  EP bonding aid, compact into position and finish with a steel float. For vertical repairs, carefully tamp the mortar into position in layers of about 10 – 20 mm, and allow to reach initial set before applying the next layers of cement keycoat or technical  EP bonding aid and cement  mortar.

On small floor repairs, cut out the damaged concrete to ensure the repair is ‘toed’ into the surrounding concrete. It is recommended that the surrounding concrete is sealed with techinal acrylic sealer, which is a low- viscosity in-surface sealer, to reduce the problems of degradation of concrete adjacent to the repair.


For further details of recommended procedures, refer to BS EN 1504-10 Site application of products.


Good curing is essential. Immediately after the finishing operation, spray with water and cover with closely-fitting polythene sheeting or spray with concrete primer and cover with close contact polythene sheet sealed at the edges with water-resistant tape.

Alternatively, spray-apply a proprietary curing membrane with a minimum efficiency of 50%. If coatings are to be applied subsequently, check the compatibility of the curing membrane, otherwise it may have to be removed before coating.


Cement mortar is supplied in 25 kg polylined bags.


1 bag yields 12•5 litres when mixed with 2•5 litres clean water.

Coverage: 1 m2 at 12•5 mm thickness.

Storage and shelf life

Shelf life is 12 months from date of manufacture if stored properly in unopened and undamaged packaging in dry conditions within the temperature range 5°C to 25°C.

If stored at higher temperatures and high humidity, the shelf life will be reduced.

Protect from frost.

Health and safety

Contains cement (Contains chromium (VI). May produce an allergic reaction). Harmful by inhalation. Irritating to eyes and skin. Keep out of the reach of children. In case of contact with eyes, rinse immediately with plenty of water and seek medical help. After contact with skin, wash immediately with plenty of soap and water. Wear suitable protective clothing, gloves and eye/face protection.

For further information, please request the Material Safety Data Sheet for this product.

Technical services

Tasir’s Customer Services Department has a team of experienced advisors available to provide on-site advice both at the specification stage and during application. Detailed specifications can be provided for specific projects or more general works. Site visits and on-site demonstrations can be arranged on request.

Sales enquiries

Tasir products are distributed throughout the world through selected stockists and distributors. Please contact the relevant Customer Services Team below for all product orders and enquiries.

Technical helpline

Tel: +86-13103917746



Fax: +86 -18503893502


Tasir Construction Material&Technology 

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

Tel: +86-571-87569602

Fax: +86-571-28197878  


To the best of our knowledge and belief, this information is true and accurate, but as conditions of use and any labour involved are beyond our control, the end user must  satisfy himself by prior testing that  the product  is suitable for his specific application, and no responsibility can be accepted, or any warranty given by our Representatives, Agents or Distributors.

Products are sold subject to our Standard Conditions of Sale and the end user should ensure that he has consulted our latest literature.

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