Restoration Mortar (RM)

Product specifications

Flexural tensile strengthAfter 7 days: approx. 4 N/mm²
After 28 days: approx. 5 N/mm²

Compressive strengthNormal < 13 N/mm²
Soft < 8 N/mm²

E-modulus (DIN 1048)Normal approx. 11 kN/mm²
Soft approx. 7 kN/mm²

Maximum grain sizeFine 0.2 mm
Medium 0.5 mm
Coarse 2.0 mm

Bond strength (28 d)Approx. 0.5 N/mm²

Bulk densityApprox. 1.7 kg/dm³

Water requirementApprox. 0.65 - 0.85 l/5 kg
Approx. 1.95 - 2.5 l/15 kg

Shrinkage deformation DIN 52450After 7 days: approx. -0.3 mm/m
After 28 days: approx. -0.7 mm/m

The stated values represent typical product characteristics and are not to be construed as binding product specifications.

‍

Preparation

Substrate requirements

• Clean, dust-free and capable of supporting a load.

Preparations

• Any necessary cleaning measures should be performed as gently as possible, e.g. by spraying with cold or hot water or steam cleaning; stubborn dirt should preferably be cleaned using the rotec soft blasting method or Remmers cleaning products (e.g. Clean FP, Clean AC basic, Clean WR).
• Preserve valuable heritage ornamental elements and statues by carefully removing encrusted dirt and using the appropriate Remmers Stone Strengthener to carry out repeated intensive strengthening.

Application

• Apply a contact layer to the pre-wetted substrate using grout (dry mortar/water) in a layer thickness of approx. 2 mm.
• Apply the mortar onto the contact layer wet-on-wet in layer thicknesses of 1.5 to 3 cm, 1 to 2 mm beyond what will become the final surface.
• Joints in the masonry must be maintained.
• Application of thin layers at the edges of defective areas can be facilitated by adding Remmers Haftfest to the mixing water (mixing ratio 1:10). In this case, hardening will be somewhat delayed but the bonding strength will be increased.
• After sufficient hardening (when the grain pops), roughen the surface or scrape down to the final surface.
• Rework the repaired areas (using a scraper or abrasion tool) onto the structure surrounding the defective area.
• Wait at least 24 hours before applying subsequent layers.

Application instructions

• Once it has hardened, mortar must not be made workable again by adding either water or more wet mortar.
• The type and duration of the reworking and surface treatment will influence the colour.
• Slight deviations in colour between different batches are possible.
• Protect wet mortar surfaces against frost, rain and drying out too quickly for at least 4 days.

Working tools / cleaning

• Clean tools with water while the material is still fresh.

Storage / shelf life

• If stored in an unopened container and in a dry place, the product will keep for approx. 12 months.

Usage

• Approx. 1.6 kg/l void
• Apply to a large enough trial area to determine the precise amount required.

‍

‍