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Sikadur-31+, Low-odor adhesive for bonding and concrete fixes, Interior & Exterior, Concrete Grey

Sikadur-31+, Low-odor adhesive for bonding and concrete fixes, Interior & Exterior, Concrete Grey

Cement & Mortar
SIKA

Sika is a global leader in specialty chemicals for the construction and industrial sectors. The company develops and supplies innovative products and systems for bonding, sealing, damping, reinforcing, and protecting structures. With a strong focus on sustainability and performance, Sika serves a wide range of applications including concrete production, waterproofing, roofing, flooring, and structural strengthening.

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General Specifications
Packaging 1.2 kg (A+B) container, 6 kg (A+B) container, 20 kg (A) container, 10 kg (B) container
Usage Adhesive for structural concrete repair, bonding plate reinforcement, filling and sealing cracks and voids
Usage Area Interior & Exterior
Color Concrete grey
Chemical Base Epoxy resin and selected fillers
Storage Conditions +5 °C to +30 °C - Store in original, unopened, undamaged packaging in dry conditions. Always refer to packaging
Density 2.00 ± 0.1 kg/L
Application Thickness 30 mm maximum
Ambient Air Temperature +10°C >< +30°C
Substrate Temperature +10°C >< +30°C
Working time 60 minutes
Waiting Time 45 - 60 minutes
Consumption 2.0 kg/m²/mm

Low-VOC epoxy adhesive for structural bonding and concrete repair

Sikadur-31+ is a two-part, low-VOC, moisture-tolerant epoxy structural adhesive which bonds to many construction materials. It is also used for structural concrete repairs, joint filling, and crack sealing. It can be used in both do-it-yourself (DIY) and professional applications.

  • Easy to mix and apply
  • Very low VOC (GEV Emicode EC1 PLUS )
  • Very good adhesion to many construction materials
  • Very good initial and ultimate mechanical strength...
  • Suitable for structural concrete repair, class R4 according to EN 1504-3:2005 (Structural and non-structural repair).
  • Good adhesion to dry and mat damp concrete.
  • Thixotropic: non-sag in vertical and overhead applications.
  • No primer required.
  • Good resistance to abrasion.
  • Good resistance to specific chemicals.
  • Differently coloured components for mixing control.
  • Impermeable to most liquids and water vapour.
  • Hardens without shrinkage.
  • Application up to 30 mm thickness in one layer.
  • Temperature application range +10 °C to +30 °C.
Usage
The Product is used as an adhesive for:
  • Structural concrete repair (Principle 3, Method 3.1 of EN 1504-9). Repair of spalling and damaged concrete in buildings, bridges, infrastructure and superstructure works
  • Structural strengthening (Principle 4, Method 4.3 of EN 1504-9). Bonding plate reinforcement
  • Structural strengthening (Principle 4, Method 4.4 of EN 1504-9).  Increasing the bearing capacity of the concrete structure by adding mortar
The Product is used for bonding the following materials:
  • Concrete.
  • Natural stone.
  • Ceramics.
  • Fibre cement.
  • Mortar.
  • Brick masonry.
  • Brick slips.
  • Steel.
  • Iron.
  • Wood.
The Product is used for repairing and reprofiling:
  • Structural concrete elements such as beams, columns, and walls.
  • Non-structural concrete elements.
  • Small patches and edges.  
The Product is used for filling and sealing:
  • Joint arrises.
  • Crack arrises.
  • Non-structural static cracks.
  • Holes.
  • Voids.
Advantages
  • Easy to mix and apply
  • Very low VOC (GEV Emicode EC1PLUS)
  • Very good adhesion to many construction materials
  • Very good initial and ultimate mechanical strength...
  • Suitable for structural concrete repair, class R4 according to EN 1504-3:2005 (Structural and non-structural repair).
  • Good adhesion to dry and mat damp concrete.
  • Thixotropic: non-sag in vertical and overhead applications.
  • No primer required.
  • Good resistance to abrasion.
  • Good resistance to specific chemicals.
  • Differently coloured components for mixing control.
  • Impermeable to most liquids and water vapour.
  • Hardens without shrinkage.
  • Application up to 30 mm thickness in one layer.
  • Temperature application range +10 °C to +30 °C.
 
Packaging

1.2 kg (A+B) container

8 × 1.2 kg carton box

32 boxes per pallet - 256 pieces

6 kg (A+B) container

96 containers per pallet

20 kg (A) container

22 containers (A) per pallet

10 kg (B) container

44 containers (B) per pallet
Colour

Part A

White

Part B

Dark grey

Part A+B mixed

Concrete grey
Technical Information
Compressive Strength

Class R4

(EN 1504-3)

~75 MPa

(EN 12190)

Curing time

+10 °C

+23 °C

+30 °C

1 day

-

~50 MPa

~50 MPa

3 days

~50 MPa

~65 MPa

~70 MPa

7 days

~70 MPa

~75 MPa

~78 MPa

Tensile Strength

Curing time

+10 °C

+23 °C

1 day

-

~8.5 MPa

3 days

~6 MPa

~16 MPa

7 days

~16 MPa

~20 MPa

Shear Strength

~16 MPa

(EN 12615)

50°  

~35 MPa

60°  

~30 MPa

70°

~25 MPa

Tensile adhesion strength

Pass

(EN 12636)

Curing Time

Substrate

Curing Temperature

Adhesion strength

7 days

Concrete dry

+23 °C

> 5 MPa *

7 days

Concrete mat damp

+23 °C

> 5 MPa *

7 days

Steel

+23 °C

> 20 MPa

* 100% concrete failure - no failure of the Product. 

Lap Shear Strength

50°

≥ 60 MPa

60°

≥ 70 MPa

70°

≥ 80 MPa

Shrinkage

~0.01 %

(EN 12617-1)

3.0 MPa (Restrained shrinkage / expansion)

(EN 12617-4)

Coefficient of Thermal Expansion

4.8 × 10-5 (±0.2 × 10-5) 1/K

(EN 1770)

Glass transition temperature

50 °C

(EN 12614)

Thermal Compatibility

Freeze and thaw

3.00 MPa

Durability

Pass

Chemical Resistance

Resistant to many chemicals. Contact Sika Technical Services for additional information.

Resistance to moisture

Sensitivity to water

Pass

Reaction to Fire

Class C-s1, d0

Class Bfl-s1

(EN 13501-1)
Application Information
Mixing Ratio

Part A : Part B = 2 : 1 by weight or volume
Layer Thickness

30 mm maximum.

For non-structural adhesive or other applications, if layer thickness’s of >30 mm are required, apply in successive 30 mm layers or once the previous layer has hardened. The surface of the freshly applied intermediate layers should be scratched to form a key for subsequent layers. If layer application is to be longer than 2 days, the wet applied adhesive must be blinded to excess with quartz sand immediately after application
Sag Flow

Non-sag up to 20 mm thickness on vertical surfaces

(EN 1799)
Product Temperature

Maximum

+30 °C

Minimum

+10 °C
Ambient Air Temperature

Maximum

+30 °C

Minimum

+10 °C
Dew Point

Beware of condensation.

Steel substrate temperature during application must be at least +3 °C above dew point.
Substrate Temperature

Maximum

+30 °C

Minimum

+10 °C
Substrate Moisture Content

Substrates must be dry or matt damp (no standing water).

Brush the adhesive well into the substrate if matt damp.
Pot Life

Temperature

Pot Life

+23 °C

~60 minutes

+30 °C

~45 minutes
Open Time

Temperature

Open Time

+23 °C

~75 minutes

+30 °C

~45 minutes