Morcemrest® SR 50

Class R4 mono - component high performance repair mortar suitable for large thicknesses.

Formulated with sulphate resisting cement.

1504-3 - R4 COV

Download technical data sheet

Additional information


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

Features and applications

  • Resistant to sulphates.
  • Class R4 repair mortar, complies with standard EN-1504-3.
  • High bonding strength and high elastic modulus High thixotropy.
  • Strong humid adherence and cohesion ( ideal for applying onto ceilings).
  • Water vapour permeable.
  • Good resistance to chlorides.
  • Resistant to freeze-thaw cycles.
  • Retraction shrinkage is compensated to minimise risk of cracking.
  • Resistant to carbonation.
  • Weather resistant.
  • Suitable for structural elements reparation such as: columns, bridge slabs, treatment plants, tunnels, pillars with heavy loads.
  • General regeneration of concrete structures.


  • Substrate must be in good condition, clean, free of grease, oil and loose parts (minimum traction strength of 1.5 MPa).
  • If necessary, prepare substrate mechanically until leave healthy concrete is reached.
  • Absorbent substrates are previously dampened to the point of saturation, avoiding water-logging. Apply MORCEMREST SR 50 when surface has become matt again .
  • If there are rebars, they must be cleaned of rust, grease and loose parts. Rusted parts must be cleaned, by sandblasting or with a metallic brush. Once cleaned protect them from rust with IMPLAREST C.
  • When used in rigid joints between vertical and horizontal concrete walls and slabs widen before the joint by cutting it to a width of 10 mm with a radial arm saw, and then remove the so cut material.

Instructions for use

Mixing the mortar:

  • Add 2/3 of total water into a clean bucket and gradually add while mixing the full amount of powder. Then add the remaining water and mix for 2 more minutes. The pot life of the mixed mortar does not exceed 30 minutes at a temperature of +20ºC; therefore do not mix more material than required. 


  • Apply MORCEMREST RF 50 with a trowel or a spray gun. In case of manual application it is necessary to press it firmly to get good adhesion and compactness .
  • MORCEMREST RF 50 can be applied in several layers, with a minimum thickness of 5 mm each. On vertical surfaces thicknesses of up to 50 mm can be applied without the aid of moulds. The maximum thickness per layer on horizontal surfaces is 100 mm.
  • If used in rigid joints between vertical and horizontal concrete walls and slabs, fill completely the width of the joint.


  • Protect from wind, ice and sun while the product is hardening. To avoid excessive drying while curing it is necessary to cover the surface of the mortar with moist sackcloth or plastic film. The curing operation is always necessary.

Cautions and recommendations

  • Do not add extra water to the mortar other than the recommended amount nor remix it.
  • Do not apply without adapted precautions below 5ºC nor above 30ºC.
  • Do not add cement, sand or other substances that could affect the material's properties.
  • Tools and instruments should be cleaned with water immediately after use and in any case before hardening of the mortar, in this case it can be removed mechanically.
  • Consult the Technical Department for any application not specified in this Technical Datasheet.
  • For any information regarding safety during handling, transport, storage and use of product please consult the current version of the Product's Safety Sheet.
  • 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 SR 50 is supplied in 25 kg bags.

Shelf life: 1 year in sealed original packaging, sheltered from weather conditions and humidity.

Technical data

(Statistical data obtained under standard conditions)

Appearance   GREY powder
Density of product in Paste form    2.0±0.1 gr/cm3
Granulometry   Dmax 2 mm
Thickness by layer   5 mm min.
50 mm max.
Compressive strength 28 days  (EN 12190) ≥ 45 N/mm² ≥ 45 N/mm²
Chloride content (EN 1015) ≤ 0.05% ≤ 0.05%
Adhesion (EN 1542) ≥ 2 N/mm² ≥ 2 N/mm²
Resistance to carbonation
(EN 13295)
dk ≤ Control concrete (MC(0.45)) Pass
Elasticity modulus (EN 13412) ≥ 20 GPa ≥ 20 GPa
Capillary absorption (EN 13057) ≤ 0.5 kg / m² x h½ ≤ 0.5 kg / m² x h½
Thermal compatibility part 1
(EN 13687-1)
≥ 2 N/mm² ≥ 2 N/mm²
Sudden cooling cycles 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



≥ 10 N/mm²
≥ 30 N/mm²
≥ 45 N/mm²

Flexural strength: (EN 12190)
28 days
  ≥ 6 N/mm²
Immersion in sulphates and sea water after 365 days Class R4 strength Class R4 strength
Pot life of mixture   20 - 30 minutes
Mixing water   17±1%
Paste yield   2.2 Kg/m²mm thickness
Classification according to EN 1504-3:2006
Sulphate resistant

CE Mark

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


Product prepared for concrete structural repairs with PCC mortar.
For vertical applications without moulds. Allows thicknesses from 5 to 50 mm
(vertical application) and from 10 to 100 mm for horizontal applications (floors).
(Polymerised hydraulic cement-based product).

Compressive strength R4 Class
Chloride ion content ≤ 0.05%
Bond strength ≥ 2 MPa
Carbonatation resistance Pass
Elasticity module ≥ 20 GPa
Thermal compatibility part 1 ≥ 2MPa
Capillary absorption ≤ 0.5 kg.m2h0.5
Reaction to fire A1



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.