Fiber reinforced high strength repair mortar, Class R4

Product Description

OMNITEK® RM Fiber is a fiber reinforced, high strength, high-sulphate resistant cement based, volume stable repair and re-profiling mortar, suitable for concrete repair in demanding environments in the safest, most targeted and productive way in layer thicknesses of 10-50mm.


  • High early- and final strength properties to strength class C60/75 for structural repair of concrete.
  • Polymer modified for an excellent adhesion, and fiber reinforced for a long-term durable repair without surface cracks.
  • High carbonatation, chloride, freeze-thaw and chemical resistance for maximum durability in all exposure conditions.
  • Stiff plastic consistency for fast, easy and cost effective application by manual application in horizontal and vertical applications.
  • CE certified according to EN 1504-3.

Field of Application

OMNITEK® RM Fiber is a most durable solution for all structural and non-structural concrete repair applications, such as:

  • General concrete repairs in vertical and horizontal conditions, as well as re-profiling applications of joints, edges and damaged precast elements and concrete structures.
  • Repair of concrete structures exposed to sea water, corrosive environments or severe freezing conditions such as:
    • Repair applications on concrete in contact with or buried under aggressive soil/ground water.
    • Road and bridge decks or structures exposed to de-icing agents.
    • Marine structures exposed to splash zones


  • CE certified according to EN 1504-3.


1. Preparation of Substrate

  • Substrate preparation has to be according EN 1504-10 part 7.
  • The substrate has to be free from dirt, grease, laitance, loose concrete, loose particles or layers which could adversely affect adhesion.
  • Remove all damaged concrete and prepare substrate by sand or grid blasting, high pressure water jetting, or other methods until base concrete is exposed, offering sufficient roughness (bond) and open pores.
  • The substrate must be pre-wetted with clean water until saturated. The substrate should be damp, but without free standing water.
  • The substrate must be frost-free and have a cohesion of minimum 1.5 N/mm².
  • Exposed or corroded reinforcement steel needs to be treated with OMNITEK® CPC.

2. Mixing

  • The product has to be mixed using a suitable forced action mixer (400-600rpm). The mixing head must be completely immersed in the powder.
  • Add 4/5 of the required quantity of water into the mixer and mix for 2 minutes. Add the remaining quantity of water. The water content can be varied to obtain the desired consistency. Never use more than the maximum water quantity. Mix for an additional 2 minute until a lump-free, homogeneous mixture is obtained.
  • The mixing time depends on the type of mixer. 4 minutes is the minimum.
  • Once the mortar is ready mixed, apply immediately. Do not prepare more material than can be used within the open time of the material.
  • When the mortar starts to set, remix but never add more water.

3. Application

  • The mortar is applied manually using a trowel. Alternatively suitable spray equipment can be used.
  • Press firmly into the application area to ensure proper adhesion and to compact the material. Take particular care in the areas around and behind reinforcement bars.
  • The material can be applied in several layers. Especially when repairing large voids it is recommended to work in several application steps.
  • Do not apply the material if the ambient temperature is below 5°C or expected to fall below 5°C within 24 hours.


4. Curing

  • After treatment has to be according EN 13610 in combination with DIN EN 1045-3.
  • In warm or windy conditions protect the applied material from dehydration by mist-spraying with clean water or protective tarpaulins until the initial set has taken place.
  • In cold conditions cover with insulated tarpaulin,
  • polystyrene or other insulating material. Protect surfaces against frost and rain until final set has taken place.
  • In cold, humid or unventilated areas it can be necessary to allow for a longer curing period, or to introduce forced air movement to avoid condensation. Never use dehumidifiers during the curing period or within 28 days after application.
  • The after-treatment should be at least 5 days.
  • The after-treatment should take place as soon as possible, at the latest when the material surface starts to set.
  • As an alternative to the conventional treatment methods, suitable curing agents can be used to prevent rapid water loss.

5. Cleaning and maintenance

  • Mixing and application equipment should be cleaned immediately with clean water. Hardened material needs to be removed mechanically.

6. Special remarks

  • Cementitious materials can lead to incompatibilities under certain conditions in combination with non-ferrous metals (such as aluminium, copper, zinc).
  • Low temperatures delay the early strength development. High temperatures accelerate the strength development and decrease the open time of the material.
  • Repaired areas can be coated after 7 days with protective or waterproofing coatings depending on the ambient conditions.

Product Properties

Technical Data/Properties(*)

    OMNITEK® RM Fiber
Properties Unit Value*
Grain size [mm] 0-2
Layer thickness [mm] 10-50
Consistency [-] Stiff-Plastic
Maximum water quantity [l/25 kg] 3.8
Open time [min] ≈ 30
Application temperature [°C] +5 to +30
Fresh mortar density [kg/dm3] ≈ 2.3
Yield (25kg bags) [l] ≈ 11
Compressive strength (**)
- 24 h
- 7 days
- 28 days


≈ 40
≈ 70
≈ 80
Strength class [ - ] C 65/70
Exposure classes (***) [ - ] X0, XC1-XC4, XD1-XD3, XS1-XS3, XA1-XA3, XF1-XF4
Moisture classes (***) [ - ] WO, WF, WA
Shelf life 12 Months
Stored under cover, clear of the ground, protected from all sources of moisture and frost.
Packaging Bags of 25 kg with plastic liner.
40 bags per pallet (1000kg)
Appearance Grey powder

(*)Typical values in production control. All tests were executed under a conditioned temperature of 21°C and 65% RH.
(**) Compressive strengths measurements based on prisms.
(***) According to EN 206-1:2001 in combination with DIN 1045-2.

CE Certificate

De Neef Construction Chemicals bvba
Industriepark 8
2220, Heist-op-den-Berg
DOP No.: GCPHEI-96625-01
EN 1504-3
Concrete repair mortar

Health & Safety

OMNITEK® RM Fiber is a product based on cement and can therefore cause burns to skin and eyes, which should be protected during use. Wear gloves and protective eye shields. Wearing a dust mask is advised. Treat splashes to eyes and skin immediately with clean water. Consult a doctor when irritation continues. If accidentally ingested, drink water and consult a doctor. Users must comply with all risk and safety phrases. MSDS’s can be obtained from GCP Applied Technologies or from our website. GISCODE ZP1. | North America Customer Service: 1 877-4AD-MIX1 (1 877-423-6491)

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.

OMNITEK 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.

© Copyright 2018 GCP Applied Technologies Inc. All rights reserved.

GCP Applied Technologies Inc., 2325 Lakeview Parkway, Suite 450, 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 United States. 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 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: 2022-05-06