Morcemrest® EF 50 R4

High resistance monocomponent R4 repair mortar for large thicknesses.

1504-3 - R4 COV DAP

Download technical data sheet

Additional information


Product based on special cements, selected aggregates and additives, reinforced with fibres.

Features and applications

  • Repair mortar class R4 according to EN-1504-3.
  • High adherence to concrete and high modulus.
  • Thixotropic, without sagging in ceiling applications.
  • Water vapour permeable.
  • Good chloride resistance.
  • Resistant to freeze-thaw cycles.
  • Joint filling between concrete sections, prefabricated elements and expansion joints.
  • Shrinkage compensated to minimize risk of cracking.
  • High resistance to carbonation.
  • Weatherproof.
  • Indoor and outdoor application.
  • Repairs of structural elements such as columns, bridge girders, water treatment plants, tunnels, pillars with large load transfer.
  • Concrete regeneration.


  • The substrate must be sound, clean, and free of grease, oil, dust and badly-bonded parts (minimum tensile strength of 1.5 MPa).
  • If necessary, prepare the same preferably using mechanical means and leave the new concrete uncovered.
  • The absorbent substrates should be previously wetted until they are saturated, preventing waterlogging, apply MORCEMREST EF 50 once the surface has a matt appearance.
  • If there are reinforcements, they should be clean of rust, grease, oil and other badly-bonded particles.
  • If they are rusty, they must be sandblasted or metal brushed.   Protect from corrosion with IMPLAREST C.
  • In vertical and horizontal wall joints, widen the joint by cutting it up to about 10 mm wide with a radial saw, removing the cut material afterwards.

Instructions for use

Mortar mix:

  • Add the prepared 2/3 parts water and progressively mix all of the powder while stirring.  Then add the remaining water and mix for another 2 minutes.  Do not prepare more material than what you are going to use for 30 minutes. (a +20ºC).


  • Apply MORCEMREST EF 50 with a trowel or projected with a gun, applying pressure to assure bonding and compact the material firmly.
  • MORCEMREST EF 50 can be applied in a few layers, the minimum layer thickness being 5 mm. Applications of up to 50 mm can be made on vertical surfaces without the help of formworks. The maximum thickness for horizontal surfaces is 100 mm.
  • Fill the joints completely


  • Protect from the wind, frost and sun during hardening.  To prevent excessive drying out, it is recommended to cover the surface with wet hessians or plastic during curing.
  • Observe protection procedures after application.

Cautions and recommendations

  • Do not add more than the recommended amount of water and do not re-knead.
  • Do not apply below 5ºC nor above 30ºC
  • Do not add cement, sand or any other substance which will alter the product properties.
  • Instruments and tools should be cleaned with water immediately after use to prevent material hardening, which has to be eliminated by mechanical means.
  • Contact the Technical Department for any application not specified in this datasheet.
  • For any information regarding the safe handling, transport, storage and use of the product please refer to the updated version of the Product Safety Datasheet.
  • If applied manually ensure the coats are strongly compacted; in areas of difficult compaction it is recommended its  mechanical application.
  •  For further information on how to prepare concrete or steel framework; consult the recommendations given by the UNE-EN-1504-10 guideline. 
  • When applying the repair mortar without a bonding bridge, the foundation of concrete must be rough, clean and well moistened before, but the surface must be free of water at the time of application, that is, the foundation must not be waterlogged. The repair mortar must be applied making it penetrate into the foundation previously prepared and must be compacted avoiding the inclusion of air in order to obtain the required strength, and to protect the reinforcement from corrosion.


MORCEMREST EF 50 comes in bags of 25 Kg of powder.
Shelf life: 1 year in sealed original packaging, sheltered from weather conditions and humidity.

Technical data

(Statistical data obtained under standard conditions)

Aspect      GREY powder
Density of paste      Aprox. 2.0 ± 0,1 gr/cm³
Granulometry   Dmax 2 mm
Coat thickness   5 mm min.
50 mm max.
Resistence to compression 28 days (EN 12190) ≥ 45 N/mm² ≥ 50 N/mm²
Chloride content (EN 1015) ≤ 0,05% ≤ 0,01%
Adhesion (EN 1542) ≥ 2 N/mm² ≥ 2 N/mm²
Resistance to carbonation (EN 13295) dk ≤ concrete control type MC (0,45) Pass
Module of elasticity (EN 13412) ≥ 20 GPa ≥ 20 GPa
Capillarity absorption (EN 13057) ≤ 0.5 kg / m² x h½ ≤ 0.2 kg / m² x h½
Thermal compatibility part 1 (EN 13687-1) ≥ 2 N/mm² ≥ 2 N/mm²
Sudden cooling cycle after high temperatures (50 cycles) (EN 13687-2) ≥ 2 N/mm² ≥ 2 N/mm²
Thermal compatibility part 4: Dry thermal cycle (50 cycles) (EN 13687-4) ≥ 2 N/mm² ≥ 2 N/mm²
Compression: (EN 12190) 
1 day 
7 days 
28 days

≥ 20 N/mm²
≥ 35 N/mm²
≥ 45 N/mm²
Flexural strength (EN 12190)
28 days
≥ 7 N/mm²
Life of mixed product    20 - 30 minutes
Water content in mixture   15±1%
Performance   2.2 kg./m²/ mm thick
Classification complies to EN 1504-3:2006 

CE Mark

Avd. Agrupación Córdoba, Núm.17 14014 (Córdoba)
Nº: 210306


Product for structurally repairing concrete with PCC mortar. For vertical
applications without formwork, it allows layers of 15 to 50 mm and , for
horizontal applications, 10 to 100 mm (made with polymer-modified hydraulic

Resistance to compression R4 Class
Chloride content ≤ 0.05%
Adherence ≥ 2 MPa
Resistance to carbonatation Pass
Elasticity module ≥ 20 GPa
Thermal compatibility part 1 ≥ 2 MPa
Capillary absorption ≤ 0.5 kg.m2h0.5
Reaction to fire A1


Environmental Product Declaration (EPD)

Cement based mortar prepared with aggregates that are supplied close to the production center, which reduces the greenhouse gas emissions that would otherwise arise from their transport. Manufactured in production centers with an Environmental management certified system following ISO 14001 regulation, offering a firm promise of sustainability and respect for the environment.
Cement based mortar with type III ecological label (the most strict) Environmental Product Declaration verified externally by AENOR.


The instructions for use are given according to our tests and knowledge and do not imply any commitment by GRUPO PUMA nor free the consumer from the examination and verification of the products for their correct use. Claims must be accompanied by the original packaging to allow a proper traceability.

GRUPO PUMA is not responsible, in any case, for the application of its products or constructive solutions carried out by the application company or other parties involved in the process and / or execution of the work, limiting the responsibility of GRUPO PUMA exclusively to the damages directly attributable to the supplied products, individually or integrated in systems, due to failures in their manufacturing process.

In any case, the drafter of the work project, the technical management or the person responsible for the work, or collaterally the application company or other parties involved in the process and / or execution of the work, must ensure the suitability of the products addressing the characteristics of them, as well as the conditions, support and possible pathologies of the work in question.

The values obtained by GRUPO PUMAS's products or its constructive solutions that, as the case may be, are determined by the EN standards or any other regulation that applies to it in each case refers exclusively to the conditions specifically stipulated in said regulation and that are referred to, among others, to certain characteristics of the support, humidity and temperature conditions, etc. without being them required in the tests obtained under different conditions, all in accordance with the relevant regulation.