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Sikadur®-31 CF Rapid

Sikadur®-31 CF Rapid is a moisture tolerant, thixotropic, structural 2-component adhesive and repair mortar, based on a combination of epoxy resins and special fillers, designed for use at temperatures between +5 °C and +20 °C.

Sikadur®-31 CF Rapid has the following advantages:
  • Easy to mix and apply
  • Very good adhesion to most construction materials
  • High strength adhesive
  • Thixotropic: non-sag in vertical and overhead applications
  • Hardens without shrinkage
  • Different coloured components (for mixing control)
  • No primer needed
  • High initial and ultimate mechanical strength
  • Good abrasion resistance
  • Impermeable to liquids and water vapour
  • Good chemical resistance
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Areas of Application

Sikadur®-31 CF Rapid may only be used by experienced professionals. As a structural adhesive and mortar for:
  • Concrete elements
  • Hard natural stone
  • Ceramics, fiber cement
  • Mortar, Bricks, Masonry
  • Steel, Iron, Aluminium
  • Wood
  • Polyester, Epoxy
  • Glass
As a repair mortar and adhesive:
  • Corners and edges
  • Holes and void filling
  • Vertical and overhead use
Joint filling and crack sealing:
  • Joint and crack arris / edge repair
 

Advantages

Sikadur®-31 CF Rapid has the following advantages:
  • Easy to mix and apply
  • Very good adhesion to most construction materials
  • High strength adhesive
  • Thixotropic: non-sag in vertical and overhead applications
  • Hardens without shrinkage
  • Different coloured components (for mixing control)
  • No primer needed
  • High initial and ultimate mechanical strength
  • Good abrasion resistance
  • Impermeable to liquids and water vapour
  • Good chemical resistance

Packaging

6 kg (A+B)

Pre-batched unit

pallets of 480 kg (80 x 6 kg)

1.2 kg (A+B)

Pre-batched unit

box of 6 x 1.2 kg

Color

Component A: white
Component B: dark grey
Components A+B mixed: concrete grey

Product Details

Sustainability / Certifications / Approvals

APPROVALS / CERTIFICATES

  • Adhesive for structural bonding tested according to EN 1504-4, provided with the CE-mark
Product Information

Composition

Epoxy resin

Shelf life

24 months from date of production

Storage conditions

Store in original, unopened, sealed and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C. Protect from direct sunlight.

Density

1.94 + 0.1 kg/l (part A+B mixed) (at +23 °C) (evacuated)
Technical Information

Compressive strength

Curing time

Curing temperature

+5 °C

+20 °C

1 day

~38 N/mm2

~57 N/mm2

3 days~58 N/mm2~63 N/mm2

7 days

~63 N/mm2

~74 N/mm2

Modulus of elasticity in compression

~6,000 N/mm2 (14 days at +20 °C)

(ASTM D 695)

Tensile strength in flexure

Curing time

Curing temperature

+5 °C

+20 °C

1 day

~14 N/mm2

~26 N/mm2
3 days~21 N/mm2~28 N/mm2

7 days

~26 N/mm2

~30 N/mm2

Tensile strength

Curing time

Curing temperature

+5 °C

+20 °C

1 day

~6 N/mm2

~16 N/mm2

3 days

~18 N/mm2

~17 N/mm2

7 days~18 N/mm2~19 N/mm2

Tensile adhesion strength

Curing timeSubstrate

Curing temperature

Adhesion Strength

1 day

Concrete dry

+20 °C

> 4 N/mm2 *

1 day

Concrete moist

+20 °C

> 4 N/mm2 *

1 daySteel+10 °C~8 N/mm2
3 daysSteel+5 °C~12 N/mm2
3 daysSteel+10 °C~13 N/mm2
3 daysSteel+20 °C~15 N/mm2

*100% concrete failure.

Shrinkage

Hardens without shrinkage.

Coefficient of thermal expansion

6.1 x 10−5 per °C (Temperature range +23 °C − +60 °C)

(EN 1770)

Heat deflection temperature

Curing time

Curing temperature

HDT

7 days+23 °C+49 °C

(thickness 10 mm)

Application

Application Information

Mixing ratio

Component A : component B = 2 : 1 by weight or volume

Layer thickness

30 mm max.
When using multiple units, one after the other. Do not mix the following unit until the previous one has been used in order to avoid a reduction in handling time.

Sag flow

On vertical surfaces it is non-sag up to 15 mm thickness.

(EN 1799)

Product temperature

+5 °C min. / +20 °C max.

Ambient air temperature

+5 °C min. / +20 °C max.

Dew point

Beware of condensation.
Substrate temperature during application must be at least 3 °C above dew point.

Substrate temperature

+5 °C min. / +20 °C max.

Substrate moisture content

Substrate must be dry or mat damp (no standing water)
Brush the adhesive well into the substrate

Pot Life

Temperature

Potlife*

Open time

+5 °C

~60 minutes

—
+10 °C~55 minutes—

+20 °C

~45 minutes

~ 45 minutes

*200 g

The potlife begins when the resin and hardener are mixed. It is shorter at high temperatures and longer at low temperatures. The greater the quantity mixed, the shorter the potlife. To obtain longer workability at high temperatures, the mixed adhesive may be divided into portions. Another method is to chill components A+B before mixing them (not below +5 °C).
Consumption

Consumption

The consumption of Sikadur®-31 CF Rapid is ~1.94 kg/m2 per mm of thickness.
Application steps

SUBSTRATE QUALITY

Mortar and concrete must be older than 28 days (depends on minimal requirement of strengths).
Verify the substrate strength (concrete, masonry, natural stone).
The substrate surface (all types) must be clean, dry or mat damp (no standing water) and free from contaminants such as dirt, oil, grease, existing surface treatments and coatings etc..
Steel substrates must be de-rusted similar to Sa 2.5.
The substrate must be sound and all loose particles must be removed.

SUBSTRATE PREPARATION

Concrete, mortar, stone, bricks: Substrates must be sound, dry or mat damp (no standing water), clean and free from laitance, ice, standing water, grease, oils, old surface treatments or coatings and all loose or friable particles must be removed to achieve a laitance and contaminant free, open textured surface.
Steel: Must be cleaned and prepared thoroughly to an acceptable quality i.e. by blastcleaning and vacuum. Avoid dew point conditions.

 

MIXING

Pre-batched units:
Mix components A+B together for at least 3 minutes with a mixing spindle attached to a slow speed electric drill (max. 300 rpm) until the material becomes smooth in consistency and a uniform grey colour. Avoid aeration while mixing. Then, pour the whole mix into a clean container and stir again for approx. 1 more minute at low speed to keep air entrapment at a minimum. Mix only that quantity which can be used within its potlife.

CLEANING OF EQUIPMENT

Clean all tools and application equipment with Sika® Colma Cleaner immediately after use. Hardened / cured material can only be mechanically removed.